Nautel NX25 / NX15 Ops and Maintenance Manual

NX15/NX25 Transmitter

Operations and Maintenance

Manual

Document:NHB-NX15-NX25-OPS

Issue: 6.0 2019-01-31

Status: Standard

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Phone: +1.902.823.3900 or

Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)

Fax: +1.902.823.3183

Nautel Inc.

201 Target Industrial Circle

Bangor, Maine USA 04401

Phone: +1.207.947.8200

Fax: +1.207.947.3693

Customer Service (24 hour support)

+1.877.628.8353 (Canada & USA only)

+1.902.823.5100 (International)

Email: [email protected]

Web: www.nautel.com

The comparisons and other information provided in this document have been prepared in good faith based on publicly available information. The reader is encouraged to consult the respective manufacturer's most recent published data for verification.

© Copyright 2019 NAUTEL. All rights reserved.

NX15/NX25 Operations and Maintenance Manual

Contents

Release control record

Description

Ac-Dc Power Stage

Exciter Stage

Control/Monitor Stage

RF Power Stage

RF Output Network

Operating the transmitter

Using the AUI

Home page - describing the first page

Menu page - describing transmitter operations

Viewing Transmitter Log

Instrument Panels - viewing displays

Meters page - viewing real-time meters

Presets - editing operational settings

Preset Scheduler

Status - viewing transmitter status

User Accounts

User Settings

System Settings page

Precorrection Settings page

Changeover page - changing exciter transfer settings

Factory Settings

Remote I/O page

Audio Player

Using the ac disconnect switch

Table of contents

vii

2-1

2-72

2-74

2-79

2-97

2-106

2-115

2-116

2-125

2-131

2-135

2-2

2-19

2-20

2-22

2-29

2-45

2-51

2-67

1-1

1-2

1-4

1-7

1-8

1-9

Page v


Using the Keyed Controlled Access System (optional)

Routine maintenance

Scheduled maintenance

Replacing the air filter

Performing on-air checks

Replacing the Control/Interface PWB battery

Inspecting lightning protection systems

Non-standard maintenance

Upgrading software

Updating or Replacing Compact Flash Card

List of terms

2-138

3-1

3-1

3-2

3-4

3-6

3-7

4-1

4-1

4-4

5-1

Page vi Issue 6.0 2019-01-31


Release control record

Issue

6.0

Date

2019-04-01

Reason

Supports hardware NARA59D and software version

NX SW 4.7 or higher.

Issue 6.0 2019-01-31 Page vii


Page viii Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual Description

Section 1: Description

This section provides a high-level description of the transmitter’s key sections. The transmitter circuitry is subdivided into five basic stages.

•

Ac-Dc Power Stage

•

Exciter Stage - see page 1-4

•

Control/Monitor Stage - see page 1-7

•

RF Power Stage - see page 1-8

•

RF Output Network - see page 1-9 (includes combiner and filter)

Refer to the functional block diagram: see Figure 1.6 on page 1-15 .

NX15/NX25 Electrical Schematics

Some descriptions in this section refer to electrical schematics (SD-#s). These are located at the end of the NX15/NX25 Troubleshooting Manual .

Redundancy

The NX15/NX25 features redundancy in all key systems:

• RF power modules

• Exciters

• Cooling fans

• Low voltage power supplies

Issue 6.0 2019-01-31 Page 1-1


Ac-Dc Power Stage

See electrical schematic

SD-1

. The ac/dc power supply stage contains the input power transformer that receives the main ac input to the transmitter. It also contains the transmitter’s low voltage power supplies and rack interface PWB. The ac/dc power supply stage also includes a three-phase SCR rectifier assembly, B+ current sensor, B+ distribution assembly, capacitor tray assembly and arc detector assembly.

Ac Power Transformer

The NX15/NX25’s power transformer can be set to use a range of input voltages. See Section

3, “Installing the power transformer” on page 3-1 in the NX15/NX25 Installation Manual .

High Voltage B+ Power Supply

The secondary of the power transformer is applied to the SCR rectifier assembly to create the transmitter’s B+ voltage (normally 400 Vdc). The output of the rectifier assembly is fed through the B+ current sensor, which supplies a B+ current sample to the rack interface PWB.

The rectifier assembly output is applied to a choke input filter and the B+ distribution assembly, which then provide the B+ voltage to the RF power modules.

The B+ discharge relay, which is part of the capacitor assembly, opens when ac power is applied and closes and ac power is removed, applying a high power discharge resistor across the

B+ bus to quickly discharge the voltage. When the discharge relay closes, a microswitch ensures the SCR rectifier is immediately inhibited.

Low Voltage Power Supplies

One phase of the power transformer’s secondary is also used to provide a source for the low voltage dc power supplies and an ac sample for the rack interface PWB. The low voltage power supply outputs (+48 V, +15 V and +12 V) are distributed throughout the transmitter via the rack interface PWB. The +48 V power supply sources the transmitter’s cooling fans. An inhibit signal, controlled by the rack interface PWB, is applied to the +48 V power supply to turn the fans on and off. The +15 V power supply sources all of the low voltage control circuitry. The +12V power supply sources the SBC and the touchscreen monitor.

Page 1-2 Issue 6.0 2019-01-31


Rack Interface PWB

The rack interface PWB provides various functions for the ac-dc power stage, including:

• Monitors the B+ voltage and regulates the SCR rectifier’s output via the B+ level control signal applied to the rectifier’s SCR control board.

• Monitors the SCR rectifier’s fan speeds, temperature and phase loss indication as well as the B+ current sample and provides this information, along with data received over a serial bus from the RF power modules, to the transmitter controller.

• Monitors the arc detector assembly.

• Generates the +30 V dc supply used by the SCR rectifier’s controller and the -15 V dc supply used by the Hall Effect B+ current sensor.

• Generates the +5V dc supply used by control logic throughout the transmitter.

• Accepts the +48V from the +48V power supply and distributes it to the fans and power module interface PWBs.

• Accepts the fan tach signal from each fan in the RF Power Stage and distributes them to the power module interface PWBs.

Issue 6.0 2019-01-31 Page 1-3


Exciter Stage

See

Figure 1.1

and electrical schematic

SD-2

. The exciter stage consists of digital AM exciter

PWBs A (A11A2) and B (A11A3), RF drive distribution PWB (A7), and PDM distribution

PWB (A8). The dual digital AM exciter PWBs provide two independent exciter sections (A and

B), which can be selected automatically or by local or remote control. The control/interface

PWB acts as an interface point for audio inputs and RF drive and PDM outputs.

Digital AM Exciter PWBs

Digital AM exciter PWBs A (A11A2) and B (A11A3) accept audio signals for analog modulation, I/Q over AES signals for DRM modulation and IBOC signals over I2S from an integrated Exgine card, and generate fully digital RF drive and interphase PDM drive signals for the power amplifiers and modulators in the RF power modules.

Audio signals for analog AM modulation can be applied as balanced analog (600 ohm impedance) or digital (AES/EBU format). All audio inputs are digitized and sample rate converted. A DSP provides initial data conditioning, including the initial filtering and interpolation of incoming audio or digital radio data.

An FPGA generates the digital PDM signals and synthesizes the carrier frequency RF drive signal. It also performs digital up-conversion, reverse path demodulation and down-conversion and B+ voltage compensation.

Figure 1.1: Exciter Stage

Analog/

Digital Modulation

Inputs Analog/

Digital

Modulation

Inputs

Digital AM

Exciter A

RF Drive (A)

PDM (A)

RF Drive 1

RF Drive 2

Digital AM

Exciter B

RF Drive (B)

PDM (B)

PDM 1/4/7

PDM 2/5/8

+15 V dc

-15 V dc

+5 V dc

Page 1-4 Issue 6.0 2019-01-31


The digital PDM component consists of six phased PDM signals, each separated by 60 electrical degrees. These PDM drive signals determine the transmitter output power level as well as the output modulation level. Three of these phases, each separated by 120 electrical degrees (e.g., 1,

4 and 7), are applied to a given RF power module. To achieve optimal harmonic cancellation, three different phases (e.g., 2, 5 and 8) are applied to the adjacent module.

Samples of the RF output voltage, RF output current, SCR rectifier temperature and RF power module temperature are monitored. If a parameter exceeds an acceptable limit, the active exciter attempts to compensate by decreasing its output power to restore the parameter to an acceptable level .

A sample of the B+ supply voltage is monitored. A B+ compensation circuit adjusts the PDM duty cycle to compensate for variations in the B+ supply in order to maintain constant transmitter output power and minimize hum.

A PDM inhibit (A or B) input is applied from the control/interface PWB to inhibit the PDM drive for a specific exciter during certain alarm/fault conditions.

RF Drive Distribution

The control/interface PWB (A11A1) accepts the RF drive (+ and -) signals from the digital AM exciter PWBs (A and B) and splits the active exciter’s RF drive 1 and 2 signals for application to the RF drive distribution PWB (A7). The RF drive distribution PWB splits the signal from the control/interface PWB and buffers the individual outputs that are provided to the RF power stage.

PDM Distribution

The control/interface PWB (A11A1) accepts the PDM signals from the digital AM exciter

PWBs (A and B) and splits the active exciter PDM signals for application to the PDM distribution PWB (A8). The PDM distribution PWB accepts each signal from the control/ interface PWB and splits it into two (+ and -) differential outputs that are provided to the RF power stage.

Issue 6.0 2019-01-31 Page 1-5


Other Functions

The exciter stage interfaces with the transmitter controller to perform other functions, including:

• Provides an RF Drive Latch signal to the transmitter controller to inhibit the RF drive for a set period of time during specific alarm/fault conditions.

• Provides a PM Enable signal for the RF power modules to monitor the PDM cable status. This signal is held “low” (0 V) by the exciter.

• Provides real-time telemetry of exciter samples over a streaming bus to the transmitter controller for use by various instruments on the AUI such as the spectrum analyzer, Smith chart, signal constellation, audio levels, etc.

• Accepts 10 MHz, 1 PPS and 1 kHz synchronization signals from the selected source (External 10 MHz, GPS Sync PWB or Combiner) for synchronizing the RF carrier frequency and phase.

Page 1-6 Issue 6.0 2019-01-31


Control/Monitor Stage


SD-3

.

The control/monitor stage monitors critical signal samples and status/alarm signals from the exciter stage, RF power stage, and ac/dc power stage. It also provides customer interfaces for monitoring transmitter status and accepts customer inputs for distribution to other system components. The control/interface PWB (A4) is the primary component of the control/ monitor stage. It provides various functions, including:

• Accepts all analog and digital modulation inputs and synchronization signals (10 MHz,

1 PPS, 1 kHz) and distributes them, along with RF voltage and current samples, to the exciter stage.

• Accepts +15 V, +5V and -15V from the rack interface to generate on-board power supply requirements.

• Monitors the forward and reflected power samples from the directional coupler and initiates a shutback when the reflected power exceeds the factory set threshold.

• Amplifies the forward and reflected power samples for the RF monitor output.

• Monitors shutback requests from the rack interface for arc detector and low B+ shutdown events.

• In conjunction with the remote interface PWB, accepts customer connections for digital remote inputs, digital remote outputs and analog outputs.

• Accepts customer connections to complete the external interlock and transmitter

(PDM) inhibit circuits.

• Contains a microcontroller that: manages presets, scheduler and exciter changeover; controls RF on/off status, controls RF symmetry, controls RF monitor level, stores network settings; manages the transmitter’s response to certain alarm/fault conditions.

• Contains push-button switches that provide backup control for the RF on/off and local/remote functions.

Issue 6.0 2019-01-31 Page 1-7


Local and Remote Interfacing

A 17-inch, colour LCD screen along with the Single Board Computer mounted on the front of the control cabinet provides an advanced user interface (AUI) for the transmitter. The AUI can be controlled by touch screen and is also available via the Ethernet connection on the SBC,

through a web browser on any web-interfaced PC or handheld device. See “Using the AUI” on page 2-2 for detailed information on AUI functionality. The SBC also accepts customer USB

connections for audio playlist functionality.

The remote interface PWB provides customer connections for the discrete wire remote I/O interface, including digital remote inputs, digital remote outputs and analog outputs. The

Remote Interface PWB also provides push-button control of digital remote inputs and LED indication of digital remote outputs that can be used as a backup control/monitor interface.

RF Power Stage

See electrical schematics

SD-4

,

SD-5 and

SD-6

. The RF power stage includes all of the transmitter’s 5 kW RF power blocks. The NX15/NX25 contains 5 RF power blocks.

Each RF power block contains two RF power modules and associated relays, a fan tray, and connections to the RF drive distribution PWB, PDM distribution PWB and rack interface

PWB. Each RF power module accepts RF drive from the RF drive distribution PWB through the power module interface PWBs and PDM from the PDM distribution PWB. B+ and +15 V dc voltages are applied to the RF power modules via the B+ distribution assembly, the rack interface PWB and power module interface PWBs. +48 V dc voltage is applied to the fan trays via the rack interface PWB. The output of each RF power module is applied to a primary winding of a series combining transformer. The resultant combined output is applied to the RF output network.

Each RF power module also:

• monitors the tachometer signals from the two fans on its associated fan tray - applied through the power module interface PWBs - and will shut down if one of the fans fail.

• controls its associated RF relay on the power module interface PWB, ensuring the relay is closed when the RF power module is disabled, allowing combiner current to continue flowing in the primary of its associated combiner transformer.

• provides status information to the rack interface PWB over a serial bus connection.

Page 1-8 Issue 6.0 2019-01-31


RF Output Network


SD-5

and

Figure 1.2 on page 1-9 . The combined RF output is filtered

through an RF network consisting of two “T” networks with a shunt third harmonic trap, and then provided to the antenna system. The RF output is monitored by an RF current probe, RF voltage probe, and directional coupler. Samples from these probes are provided for control and

monitoring purposes (see “VSWR Protection” on page 1-10

). A static drain choke provides a dc short to ground to dissipate static build-up on the antenna system, and an adjustable spark gap provides protection for the transmitter output from lightning events on the antenna.

Figure 1.2: RF Output Network

RF Voltage Sample

RF 1 (+)

A41 Voltage Probe

RF 1 (-)

RF 2 (+)

L L L

RF Out to Antenna

RF 2 (-)

RF 3 (+)

RF 3 (-)

RF 10 (+)

L

Forward Power

Sample

Reflected Power

Sample

RF Current Sample

RF 10 (-)

Issue 6.0 2019-01-31 Page 1-9


VSWR Protection

The transmitter uses an advanced DSP based VSWR protection system. Circuitry in the RF output network (see

Figure 1.2 on page 1-9 ) samples the RF voltage and RF current at the input

to the harmonic filter. These current (I) and voltage (V) samples are applied to ADCs on the digital AM exciter PWBs. The digitized I and V signals are used to calculate the impedance (Z) at the combiner output. An FPGA performs high-speed calculations, so there is minimal response delay.

There are several types of VSWR protection, which continuously operate:

Peak Reflected Power from Directional Coupler

Fast VSWR protection is used to detect transient faults when the reflected power quickly increases due to arcing, lightning or short circuits. The protection circuit is set for a peak reflected power equivalent to 1.5:1 at 15 kW (NX15) or 25 kW (NX25) plus 100% peak

modulation using the reflected power sample from the directional coupler (see Figure 1.2 on page 1-9 ), and triggers the controller's Fast SWR Shutback alarm, designed to shutback PDM

(reduce power to zero) and disable RF drive in less than 100 ns. This protection ensures that the RF drive to the RF power modules is disabled in less than one RF carrier period, preventing the amplifier from operating into a potentially harmful load.

Calculated Reflected Power from I and V Samples

The peak reflected power calculated by the FPGA is supplementary to the fast SWR protection, allowing the exciter to detect and control the response to the event. The peak reflected power limit - based on a VSWR of 1.5:1 at rated power plus 100% peak modulation - is 16 % of the transmitter's rated power (i.e. 4 kW). If this limit is exceeded, the transmitter’s output power instantly reduces to 0 W. This triggers the exciter's SWR Shutback alarm.

Page 1-10 Issue 6.0 2019-01-31


Shutback:

Shutbacks can be caused by the following alarms: SWR Shutback (exciter), Fast SWR Shutback

(controller), Over-Current Shutback (exciter), Over-Voltage Shutback (exciter) and Arc

Shutback (controller).

• During a single shutback event (see

Figure 1.3

), the transmitter reduces the output power to 0 W, and remains in that state for 100 ms. This allows time for an arc or transient fault to clear. After 100 ms, the output power exponentially ramps up (to the power set point or the power limit set by the exciter, whichever is lower).

• After 30 s, the transmitter returns to full power under control of the normal ALC.

When a shutback occurs, the cutback accumulator is set to a normalized value of 1.

This value decays at a rate of 1/60 of a second (0.0167 s) so after 60 s, the accumulator value returns to 0 and the shutback event is no longer in memory.

Figure 1.3: Shutback Event

Issue 6.0 2019-01-31 Page 1-11


Cutback:

A cutback occurs after multiple shutback events. When three shutback events occur within a

15 s period, the shutback accumulator exceeds its threshold. The transmitter responds by limiting the output power to 85% of the previous power set point or the power at which the shutback event occurred, whichever is lower. When multiple cutback events occur, the output power is reduced by 85% of the current level after each event. The minimum cutback power level is 25% of full carrier power. Further cutbacks will not decrease the power beyond this point. When the transmitter is recovering from a cutback event, the accumulator must first reach 0, which takes 60 s. After that, transmitter power is gradually restored to full power

according to the curve shown in Figure 1.4

.

Every SWR event that occurs is stressful to the RF amplifier; the more events that occur, the more chances there are for a power module to fail due to an SWR event. The purpose of the cutback routine is to decrease the voltage being applied to the RF amplifier when multiple

SWR events are occurring. Doing so decreases the stress on the RF amplifier during each event, decreasing the probability of a power module failure.

Figure 1.4: Cutback Recovery Time

Page 1-12 Issue 6.0 2019-01-31


Average Reflected Power Foldback

If the average reflected power, calculated over a nominal 5 s period, exceeds a limit of 4% of rated power, the output power is gradually reduced in order to maintain a reflected power that is less than this limit. This gradual reduction in power into high VSWR allows the transmitter to continue to operate into VSWR levels as high as 1.5:1 at full carrier power and even higher

VSWR levels when the carrier power is reduced. This VSWR protection is intended to protect against short or open circuits when the transmitter is turned on, as well as non-transient faults such as a poorly tuned antenna system.

Issue 6.0 2019-01-31 Page 1-13


Page 1-14 Issue 6.0 2019-01-31


Figure 1.6: NX Series Transmitter Block Diagram

Issue 6.0 2019-01-31 Page 1-11


Page 1-12

This page left bla

Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual Operating the transmitter

Section 2: Operating the transmitter

This section provides information about operating the NX15/NX25 transmitter:

•

Using the AUI - see page 2-2

•

Home page - describing the first page - see page 2-19

•

Menu page - describing transmitter operations on page 2-20

•

Viewing Transmitter Log - see page 2-22

•

Instrument Panels - viewing displays - see page 2-29

•

Meters page - viewing real-time meters - see page 2-44

•

Presets - editing operational settings - see page 2-50

•

Preset Scheduler - see page 2-65

•

Status - viewing transmitter status - see page 2-70

•

User Accounts - see page 2-72

•

User Settings - see page 2-77

•

System Settings page - see page 2-95

•

Precorrection Settings page - see page 2-104

•

Changeover page - changing exciter transfer settings - see page 2-113

•

Factory Settings - see page 2-114

•

Remote I/O page - see page 2-123

•

Audio Player - see page 2-128

•

Using the ac disconnect switch - see page 2-132

Issue 6.0 2019-01-31 Page 2-1


Using the AUI

The NX15/NX25 has an advanced user interface (AUI) that is displayed on a 17-inch, colour

LCD screen mounted on the front of the control cabinet (see

Figure 2.1

). The AUI is controlled locally by a touch screen or remotely using a PC and a web browser.

This section includes the following topics:

•

“Logging into the AUI” on page 2-3

•

“Describing the AUI layout” on page 2-9

•

“Navigating from page to page” on page 2-12

•

“Summarizing the AUI pages” on page 2-13

Figure 2.1: Front Panel AUI

NOTE

: Depending on the connection speed, it may take some time to display the AUI login screen remotely using a PC and a web browser. The amount of data that has to be transmitted is approximately 14MB. Therefore, if the connection speed to the transmitter is 1Mb/s, it will take approximately 2 minutes for the login screen to load.

Page 2-2 Issue 6.0 2019-01-31


Information is displayed in a series of pages (screens) that serve specific transmitter functions.

The AUI has the following configurable displays:

• Instrumentation panels ( See “Instrument Panels - viewing displays” on page 29.

)

• Real-time meters ( See “Meters page - viewing real-time meters” on page 44.

)

• Transmitter status ( See “Status - viewing transmitter status” on page 70.

)

• Events logs ( See “Viewing Transmitter Log” on page 22.

)

• Presets (

See “Presets - editing operational settings” on page 50.

)

• System settings (

See “System Settings page” on page 95.

)

• Pre-correction settings ( See “Precorrection Settings page” on page 104.

)

• User Accounts (

See “User Accounts” on page 72.

)

• Changeover ( See “Changeover page - changing exciter transfer settings” on page 113.

)

• User settings (

See “User Settings” on page 77.

)

• Remote input/output configuration (

See “Remote I/O page” on page 123.

)

• Scheduler (

See “Preset Scheduler” on page 65.

)

• Audio Player ( See “Audio Player” on page 128.

)

See the complete AUI flow diagram illustrated in Figure 2.2 on page 2-5.

Logging into the AUI

The transmitter’s AUI provides a means to restrict local and remote access to transmitter control functions to authorized users only. User accounts can be pre-defined to set access restriction from read-only (no control) and full-administrative control.

Access the AUI using a web browser as follows:

1. Configure your network settings (see See “Setting up the Network” on page 78.

).

Issue 6.0 2019-01-31 Page 2-3


2. On your router or firewall software, open ports 3501 and 80 and close (restrict access to) port 22. If you are using RDS data, open port 7005. If you are using SNMP, open port 161.

3. Enter the IP address in a web browser’s address field.

4. When properly configured, the login menu (see Figure 2.3 on page 2-7 ) appears. Your

IP address and any login messages appear in a box at the top, beside the logo, and the current software version number appears along the bottom of the login window.

If the login menu does not appear, then your login may not be properly configured and you should consult the documentation for the

User Accounts

page (see See “User

Accounts” on page 72.

).

NOTE

: Depending on the connection speed, it may take some time to display the AUI login screen remotely using a PC and a web browser. The amount of data that has to be transmitted is approximately 14MB. Therefore, if the connection speed to the transmitter is 1Mb/s, it will take approximately 2 minutes for the login screen to load.

5. Log in to the AUI by entering the appropriate parameters in the login window.

• In the

Language

field, click the down-arrow to review a drop-down menu displaying the available language options, and select one.

• In the

User field, enter the username. Default is “Nautel”.

• In the

Password

field, enter the password. Default is blank.

NOTE

: The Nautel AUI is factory configured with a default login username and password.

Nautel recommends that you change the password to improve overall system security. See

See

“Changing the password” on page 74.

.

• Press

Submit to accept your login parameters and display the AUI

Home

page

( Figure 2.4 on page 2-9 ). Note: The opening screen (the

Home

page) will have the layout from the previous login session.

NOTE

: If you do not have a user account, it must be set up by an existing user with proper

permissions. See See “Adding a user” on page 74.

.

6. At any time, you can access the login menu by clicking the

Logout

button (and then

OK

) at the bottom, right-hand corner of the AUI (see Figure 2.4 on page 2-9 ).

Page 2-4 Issue 6.0 2019-01-31

Issue 6.0 2019-01-31

HOME PAGE

(see

page 2-19 )

Menu

(see page 2-20 )

Status

(see page 2-70

)

Logs

(see

page 2-22 )

(Return to)

Home

Presets

(see

page 2-50

)

Factory

Settings

(see page 2-114

System

Settings

(see page 2-95 )

Precorrection

Settings

(see page 2-104

General

Analog Settings

Digital Settings

Audio Loss

Audio Inputs

B+ Calibration

Forward/Reflected Power

RF Symmetry

SWR Thresholds

Transmitter Type

Transmitter Frequency

PDM Settings

Reset

Upgrade Software

Exciter Clock Calibration

RF Monitor Level

Power Lockout

Power Thresholds

Mag-Phase Delay

B+ Setpoint

AM-AM Correction

AM-PM Correction

Envelop Equalization

Configurations

Exciter Synchronization

User Accounts

(see page 2-72

)

Create/Remove User

Change Password

Set User Type/Permissions

Changeover

(see

page 2-113 )

User Settings

(see page 2-77 )

Remote I/O

(see page 2-123 )

Network Setup

Email Configuration

Notifications

Exgine Settings

SNMP Configuration

Critical Parameters

Time Setup

NTP Servers

Nautel Phone Home

Call Sign/ID

Inputs

Outputs

Scheduler

(see

page 2-65 )

Audio Player

(see

page 2-128

)

Playlist

Streams

Figure 2.2: NX Transmitter AUI Flow Diagram

Page 2-5 (Page 2-6 Blank)


NOTE

: A maximum of ten remote connections may be logged in at a given time. If any connection is idle for more than 30 minutes, that user will be logged out, opening a spot for another user to log in.

Figure 2.3: AUI Login Menu

IP Address and login messages

Software version

Access the AUI locally as follows:

The transmitter’s front panel touch screen allows viewing of the AUI pages, regardless of the login status, but you must log in and have the proper permission level to access functions that can alter transmitter control settings.

1. Ensure the transmitter is on or apply ac power to the transmitter.

2. If the

Local Autologin

feature is properly configured (see “User Accounts” on page 2-

72 ), the AUI

Home

page will display without a login requirement.

3. If the

Local Autologin

feature is not configured, the login menu (see Figure 2.3 on page

2-7 ) will appear on the touch screen.

4. A keyboard menu appears on the display when you touch the

User

or

Password

field.

Enter your User name and Password, then press

Submit

.

NOTE

: If you do not have a user account, it must be set up by an existing user with proper

permissions. See See “Adding a user” on page 74.

5. At any time, you can access the login menu by pressing the

Change User button (and then

OK

) at the bottom, right-hand corner of the AUI (see Figure 2.4 on page 2-9 ).

Issue 6.0 2019-01-31 Page 2-7


Describing the AUI layout

The AUI begins with the

Home

page ( Figure 2.4

) and all navigation starts from this screen.

Figure 2.4: Home Page

Scheduler

Forward Power

Reflected Power

Active Preset

Mode

Selected

Meters

TOP BANNER

Same items in all windows

TASK AREA

Displays various panels and pages

Instrument panels

BOTTOM

BANNER

Same items all windows

Login username Buttons to access other pages login screen appears as

‘Change User’ locally

The “top banner” is permanent on all AUI pages and includes the following items:

•

Logo :

In any AUI page, select the logo to log out and return to the login window.

•

Date & Time :

Displays the current date and time. Press

Menu > User Settings to access the

Time Setup page to edit the time and date (

See “Time Setup” on page 89.

).

•

Scheduler :

Displays the on/off status of the Scheduler. Press the

Scheduler

button

(upper panel) to toggle the status or press

Menu > Scheduler

to open the

Scheduler

page to edit scheduler rules ( See “Preset Scheduler” on page 65.

).

Page 2-8 Issue 6.0 2019-01-31


•

Transmitter :

Displays information about the active preset (transmission mode, frequency, set point, forward power and reflected power). Press

Menu > Presets

(bottom panel) to open the

Presets

page and edit this information ( See “Presets - editing operational settings” on page 50.

). The current setpoint can be edited directly by pressing in

this area.

•

Preset :

Displays the active preset. Press this area to open the

Activate Preset

menu and select the active preset.

•

Exciter :

Displays the active exciter (A or B), a L+R modulation meter and a meter that displays the magnitude of the envelope with respect to the current peak power capability of the transmitter. The current level is marked in yellow, rms level is in green and the peak level is marked in red. Press the A or B button (upper panel) or press

Menu >

Changeover

to open the

Changeover

page and edit this information ( See “Changeover page - changing exciter transfer settings” on page 113.

)

The “bottom banner” is also permanent on all AUI pages and includes the following buttons, some of which open other menus and displays:

•

RF On

: Press to enable the transmitter’s RF power stage.

•

RF Off

: Press to disable the transmitter’s RF power stage.

•

Menu

: Press to open a page that reveals transmitter control options that open other pages (

See “Menu page - describing transmitter operations” on page 20.

).

•

Status

: Press to open a page that reveals current alarms and status details ( See “Status - viewing transmitter status” on page 70.

).

•

Logs

: Press to open a page that reveals historical alarms and status records for the transmitter (

See “Viewing Transmitter Log” on page 22.

).

•

Local/Remote

: Press to enable/disable remote operation of the transmitter. If

Local

is highlighted green, only local AUI control is possible. If both

Local

and

Remote

are highlighted green, remote operation is enabled, while local control is still possible. See

Table 2.1 on page 2-11

for a list of remote functions available when remote control is enabled or disabled .

•

Change User/Log Out

: Press to display a login menu. A keyboard menu appears when you press the Username or Password field. Enter your username and password, then press

Done

. If you do not have a user account, see

“User Accounts” on page 2-72 . The

Change User button will display as

Log Out

while in remote operational control.

Issue 6.0 2019-01-31 Page 2-9


Table 2.1: Available AUI Remote Functionality when Remote Control is Enabled or

Disabled

Remote Enabled

Full remote control functions; same as local AUI

Remote Disabled

Only the following remote AUI functionality is available when remote control is disabled. All other functionality is unavailable remotely.

• Full viewing access

• Ability to change active instruments, but not their settings

• Full control of meter lists - selecting meters to view and managing meter list

• Ability to load presets in the Presets menu for viewing purposes only cannot save changes; cannot activate presets

• Full access to logs and the Log Manager

• Ability to reboot the AUI

• Ability to view software details and history, and managing software upgrade files

• Full control of User Accounts

• Full control of the following User Settings menus:

Email Configuration

Notifications

SNMP Configuration

Critical Parameters

Nautel Phone Home

Call Sign/ID

NOTE : Time Setup and NTP control are not available when remote is disabled because of the scheduler; changing the time can affect the current on-air preset

The “task area” displays the AUI functions such as transmitter status and hardware settings:

•

Instrument Panels :

Display up to four panels on the screen at one time. To reveal the instrument-panel options, press X in the upper right corner of one panel to close an existing panel, and then press the “cog” icon to display a menu of panels (

See “Instrument Panels - viewing displays” on page 29.

).

•

Meters :

Displays the real-time meters that provide a system review of the transmitter

(

See “Meters page - viewing real-time meters” on page 44.

).

Page 2-10 Issue 6.0 2019-01-31


Navigating from page to page

You navigate through the AUI screens from the

Home

page or from the

Menu

page

( Figure 2.5

).

The

Home

page is the first screen to appear when you login into the AUI. You can return to this page from any AUI screen by pressing the logo (upper left corner) or by selecting

Menu >

Home

. The

Menu

page is accessed from the “bottom panel” by pressing

Menu

.

Figure 2.5: Home page and Menu page selection items logo

(home page) scheduler active preset current exciter

(page) meters

(pages)

1 2

3 instrument panel menu

(up to four panels)

Presets toggle

Precorrection

Home

System Settings

Changeovers

Scheduler

4

HOME PAGE transmitter status events history

Log In/Log Out toggle

Factory settings

User accounts

Remote I/O

User Settings

Audio Player

MENU PAGE

Issue 6.0 2019-01-31 Page 2-11


Summarizing the AUI pages

Table 2.2 identifies the available AUI pages.

AUI Page

Home (first page)

Function

Displays an overview of transmitter features, including various meters and instrument panels. Choose options and navigate to other pages.

See Page page 2-9

(available via local or remote operation)

Menu


Choose options and navigate to other pages.

page 2-20

Logs


View a history of transmitter events.

page 2-22

Page 2-12 Issue 6.0 2019-01-31


AUI Page

Instrument Panels


Function See Page

Choose the instrument panel option(s). 16 options are available. Up to four screens can appear on one page. page 2-29

System Review

(Meters)


Choose meters for display.

Presets


Activate and edit user-defined presets.

page 2-44

page 2-50

Issue 6.0 2019-01-31 Page 2-13


AUI Page

Scheduler

(available via local operation or remote operation)

Function

Create and edit scheduler rules.


See Page page 2-65

Transmitter Status


View transmitter’s active faults. page 2-70

User Accounts


Set user permission rights and define user accounts. page 2-72

Page 2-14 Issue 6.0 2019-01-31


AUI Page

User Settings


Function

Set network information, configure email and alarm notification parameters, configure Exgine interface information, configure SNMP information, capture critical parameters, set time and date, enable/ configure NTP servers and set call sign/ID..

See Page page 2-77

System Settings


** Screen configuration available local only

Reboot AUI or active exciter, perform software upgrades, configure screen settings (local only) calibrate exciter clock, set the RF monitor sample level, configure power lockouts and configure low forward power thresholds.

page 2-95

Issue 6.0 2019-01-31 Page 2-15


AUI Page

Precorrection Settings

Function

Control various critical parameter functions using the

Precorrection page .

See Page

page 2-104


Changeovers


Set the main exciter and auto changeover functions.

page 2-113

Factory Settings


Displays the settings for the transmitter that are set at the factory.

page 2-114

Remote I/O


Define remote digital inputs and outputs.

page 2-123

Page 2-16 Issue 6.0 2019-01-31


AUI Page

Audio Player


Function

Manage the audio playlist files.


See Page

page 2-128

Issue 6.0 2019-01-31 Page 2-17


Home page - describing the first page

The

Home

page ( Figure 2.6

) is the first screen to appear after you log into the AUI. It contains the images that were last viewed in the AUI, from the previous login session.

You can return to the

Home

page, from any screen, by pressing the logo in the upper, left corner or by pressing

Menu>Home

.

Figure 2.6: Home page example

The

Home

page layout is provided in the AUI description (see Figure 2.4 on page 2-9 .).

Page 2-18 Issue 6.0 2019-01-31


Menu page - describing transmitter operations

The

Menu

page displays icons that link to pages that control various transmitter operations

( Figure 2.7

). Press

Menu

in the “bottom panel” of an AUI screen to open this window of options.

Figure 2.7: Menu Page

From this page, you can select the following operations:

• Press

Home

to return to the home page (

See “Home page - describing the first page” on page 19.

).

• Press

Presets to open screens related to presets (

See “Presets - editing operational settings” on page 50.

).

• Press

Factory Settings

to open a window where you can view the factory settings for the transmitter (

See “Factory Settings” on page 114.

).

• Press

System Settings

to access pages that allow you to reset the AUI or active exciter, perform software upgrades, calibrate exciter clock, and set power lockouts and

power thresholds ( See “System Settings page” on page 95.

).

Issue 6.0 2019-01-31 Page 2-19


• Press

Precorrection Settings

to control various critical functions related to precorrec-

tion, ( See “Precorrection Settings page” on page 104.

).

• Press

User Accounts

to access a page that displays a list of users with access to the AUI

and, depending on permission level, allows you to access user accounts ( See “User

Accounts” on page 72.

).

• Press

Changeovers

to access a page that allows you to set the main (active) exciter and

setup the automatic exciter changeover ( See “Changeover page - changing exciter transfer settings” on page 113.

).

• Press

User Settings to access a page that allows network configuration, email configuration and alarm notifications, setting of Exgine parameters, SNMP configuration, capturing critical parameters, setting date and time, enabling and configuration of NTP

servers and setting call sign ( See “User Settings” on page 77.

).

• Press

Remote I/O

to access a page that allows configuration of digital inputs and digital

outputs ( See “Remote I/O page” on page 123.

).

• Press

Scheduler

to access a page that allows you to schedule preset changes ( See “Preset Scheduler” on page 65.

).

• Press

Audio Player to access the built in audio player and add/manage playlists, Icecast

or Shoutcast streams.( See “Audio Player” on page 128.

).

Page 2-20 Issue 6.0 2019-01-31


Viewing Transmitter Log

You can view the NX15/NX25’s events log using the Log page - see Figure 2.8

. This page shows a configurable log of all transmitter events. To view the Log page , click the

Log

button in the bottom banner of the AUI screen.

Figure 2.8: Log page

Selects item at top of current page

Selects next lower page

Scrolls up one item

Scrolls down one item

Selects next higher page

Selects item at bottom of current page

Maximum 100 items per page

Maximum 20 pages per batch (2000 items)

(use filtering to view older batches)

The main screen displays a chronological listing of events. Depending on the selections made in the

Log Manager

screen (see

“Managing the Log” on page 2-23 ), the events displayed may be

filtered by the originating device [Controller, Exciter, Rack or PM (power module)], and the time of occurrence. A maximum of five batches (10,000 items) are stored on the AUI. Older items are discarded.

Refer to the NX15/NX25 Troubleshooting Manual to cross-reference the alarm name to possible causes and troubleshooting tips.

Issue 6.0 2019-01-31 Page 2-21


The number of log matches displayed is shown below the

Log Manager

button (e.g., 157

Matches Sorted by Time of Event). You can scroll through the list using the scroll bar or the up and down arrow buttons to the right of the scroll bar. When there are more than 100 matches in the list, a

Page #/#

tab will appear to allow viewing of further listings. In this case, click on

Page #/#

, select the desired page from the

Select a Page

window, then click

OK

to view that page or

Cancel

to return to the

Transmitter Log

page. You can also scroll through the pages using the appropriate arrow button on the right-hand side of the display (see Figure 2.8 on page 2-22 ). The columns in the display indicate specific information about the event:

•

Device

indicates the origin device of the event (Controller, Exciter, Rack, RF

Module, etc.).

•

Event

indicates the event name.

•

State

indicates whether the event is active (red bell) or cleared (green checkmark) and in some cases, indicates whether the RF was turned on or off (see

Legend under

Log Manager

, Figure 2.13 on page 2-28 ).

•

Severity

indicates how the event affects transmitter operation

–a single yellow ! indicates low severity (RF output not affected)

–a single orange ! indicates medium severity (RF output is reduced)

–two red ! indicates high severity (RF output is inhibited)].

•

Time of Event

indicates the time and date that the event occurred.

Managing the Log

You can manage the NX15/NX25 AUI’s events log by clicking on the

Log Manager

button

(see Figure 2.9

). This screen provides options to perform various event monitoring operations such as filtering, copying, deletion and statistical analysis. Click

X

to close this window.

Page 2-22 Issue 6.0 2019-01-31


Figure 2.9: Log Manager options (Filter Logs shown)


Filter

You can filter transmitter events based on their origin or date by clicking the

Filter Logs button in the log manager (see Figure 2.9

).

Click the

Device

drop-down arrow, and select the desired device type to filter events based on the type selected. Click the

OK

button or the

Cancel

button when done.

•

No selection

- displays all transmitter events

•

Controller

- displays controller events only

•

Exciter

- displays applicable exciter events only

•

Rack #

- displays applicable Rack # events only

•

PM #

- displays applicable power module # events only

Click the

Select All

radio button (default) to show all of the most recent events for the device type selected. A maximum of 2000 items (in 20 pages) can be displayed per ‘batch’. Click the

OK

button or the

Cancel button when done.

Click the

Filter by Date

radio button to filter events based on a selected date and time range, and the device type selected. Click the

OK

button or the


Click the

Get Next Batch radio button to display the previously logged batch of events (up to

2000 items) for the device type selected. Click the

OK

button or the


Click the

Cancel

button to close this window and discard changes.

Issue 6.0 2019-01-31 Page 2-23


Copy

You can create a copy of all the logs in the selected list (copied to the remote user’s computer clipboard) by clicking on the

Copy Logs

button in the log manager (see Figure 2.10

). You can paste the tab-delimited text copy of the logs into a text editing program such as Word, Excel,

Notepad, etc. Click

OK

or

Cancel


Figure 2.10: Copy Logs

Page 2-24 Issue 6.0 2019-01-31


Delete

You can delete all events or a selection of events by clicking on the

Delete

button in the log manager (see Figure 2.11 on page 2-26 ).

Click the

Delete All

checkbox and click

OK

to delete all events.

Click the

Delete by date

checkbox to allow deletion of events that occurred prior to (

Older than

) a user-specified date and time. Use the up and down arrows to select the date and time and click

OK

to delete the specified events.

Click the

Cancel

button to close this window and discard changes.

Figure 2.11: Delete Logs

Month Day Year Hours Minutes

Issue 6.0 2019-01-31 Page 2-25


Statistics

You can view statistical information on the events being displayed by clicking on the

Statistics

button in the log manager (see

Figure 2.12

). The

Statistics

screen groups similar events that occurred within the filtered period as well as the time and date of the earliest and latest event occurrence for each event type. You can move through the list using the scroll bar

(if applicable) or the up and down arrow buttons to the right of the scroll bar. If the event log display spans over more than ten rows, use the arrows on the side of the display to scroll to more screens. Click

OK

or

Cancel


Figure 2.12: Log Statistics

Selects item at top of current page

Selects next higher page items

Scrolls up one item

Scrolls down one item

Selects next lower page items

Selects item at bottom of current page

The columns in the display indicate specific information about the events:

•

Device:

refers to the device that is associated with the alarm. The device options are

Controller, Exciter, Rack and PM (power module).

•

Event

: describes the alarm (e.g., Local/Remote switch).

•

Severity:

identifies the seriousness of the alarm [a single yellow ! indicates low severity (RF output not affected); a single orange ! indicates medium severity (RF output is reduced); two red ! indicates high severity (RF output is inhibited)].

•

# Events:

indicates the number of times the same alarm has occurred for the same device.

•

Earliest

: indicates the first time of an alarm occurrence.

•

Latest

: indicates the last time of an alarm occurrence, If an alarm has only one occurrence (i.e.,

# Events

column is

1

), then the time in the

Earliest

column will be the same as the time in the

Latest

column.

Page 2-26 Issue 6.0 2019-01-31


Legend

Click on the

Legend

button in the

Log Manager

(see Figure 2.13

) to display a legend that describes the meaning of the symbols shown in the

State

and

Severity

columns of the

Log page. Click

OK

or

Cancel


Figure 2.13: Log Manager - Legend

Issue 6.0 2019-01-31 Page 2-27


Instrument Panels - viewing displays

The central area of the

Home

page displays up to four panels of instrument information. You can choose which panels to display from 12 possible information panels ( Figure 2.14

).

Figure 2.14: Instrument Panel Options

To view the instrument panel options, close an existing panel by pressing X (upper-right corner) and then press the “cog” icon to open the

Tool Menu

. Press an icon to display that panel.

Each panel has its own navigational controls. See

Table 2.2 on page 2-30 for a description of

each tool menu panel and a cross-reference to more detailed information.

Page 2-28 Issue 6.0 2019-01-31


Table 2.2: Tool Menu Panels

Tool

Spectrum

Description

Displays a spectrum analyzer, capable of monitoring the transmitter’s RF output spectrum and the spectrum of the signal generated by the exciter.

See Page page 2-31

EQ Frequency

Response

EQ Impulse

Response

EQ Filter Delay

Displays the frequency response of the exciter’s EQ filter.

Displays the impulse response of the exciter’s EQ filter.

page 2-33 page 2-34

AM-AM Correction

Displays the delay of the exciter’s EQ filter across its bandwidth.

Displays the amplitude compensation being applied to the magnitude signal.

page 2-35 page 2-36

Displays the compensation being applied to the phase signal.

page 2-37 AM-PM Correction

Signal Constellation For IBOC mode only. Displays the phase and amplitude of the symbols being modulated within an OFDM sub-carrier as dots on a cartesian graph. Also displays timing and data carrier information.

page 2-38

Lissajous Plot Displays a Lissajous figure that represents the resultant vector

(magnitude and phase) for the applicable channels (either L and R or I and Q).

page 2-39

Smith Chart

Modulation Levels

Audio Inputs

Displays the impedance of the load as seen at the input to the transmitter’s combiner.

page 2-40

page 2-41

Displays L+R modulation, Envelope Magnitude and I/Q modulation. I/Q bar graphs are relevant for DRM or IBOC mode only.

Displays the program input levels. Bar graph labels indicate the source of each display.

page 2-42

Power Distribution Displays a CCDF plot that indicates the probability of exceeding a given power level, based on the average power level. Aids in determining peak power capability.

page 2-43

Issue 6.0 2019-01-31 Page 2-29


Figure 2.15: Spectrum Analyzer


Peak Cog

Cursor

Left

Cursor

Right

Minimize

(Maximize)

Close

Spectrum analyzer.

See

Figure 2.15

. The carrier level is normalized to its unmodulated level

at 0 dB. The graph center is always at the carrier frequency, as defined by the Exciter’s set

Frequency value.

Masks are shown based on transmission mode and are defined by the following standards:

• Analog AM standard: NRSC-2-B

• DRM and DRM+AM standards: ITU-R SM.328-11 and ITU-R SM.1541-4

• IBOC and IBOC+AM: NRSC-5-C

NOTE:

Any spurious emissions that are displayed are a product of the spectrum analyzer and are not actually present on the transmitter output.

Touch on the panel to display a cursor on the trace in the approximate area. The cursor position (frequency and amplitude) is shown in the upper, right-hand corner of the panel. The center frequency is shown in the upper, left-hand corner of the panel. Touch in other areas of the spectrum analyzer panel to provide a coarse adjustment of the cursor position.

Page 2-30 Issue 6.0 2019-01-31


Use the left and right buttons to make fine adjustments.

Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the panel size.

Use the “peak” button to place the cursor on the next successive peak (moving left to right) in the spectrum.

Use the “cog” button to gain access to spectrum settings (see Figure 2.16

) such as:

•

Resolution Bandwidth:

determines the FFT bin size or the smallest frequency that can be resolved. Set between 90 Hz and 2500 Hz (default is 300 Hz). Decreasing this value provides better frequency resolution, but will increase the sweep time.

•

Span

: determines the start and stop frequencies of the analyzer with the carrier frequency always at the center. Set between 20 kHz and 300 kHz (default is 150 kHz).

•

Averages

: determines the number of averages that the analyzer performs per sweep. Set between 0 and 100 (default is 19).

•

Measurement Source

: determines the source of the spectrum plot (transmitter output, audio analyzer, etc.) that is being displayed. Selecting

TX Output

uses the exciter’s RF sample feedback signal to display the RF output spectrum. Selecting

Audio Analyzer displays the composite baseband signal.

•

Clear Averaging:

resets the averaged signal shown on the spectrum analyzer.

Figure 2.16: Spectrum Settings

Issue 6.0 2019-01-31 Page 2-31


Equalizer screens.

The NX15/NX25’s exciter includes a fixed equalizer to optimize audio performance. There are three menus available in the tool menu panels -

EQ Frequency

(see

Figure 2.17

),

EQ Impulse Response

(see Figure 2.18 on page 2-34 ) and

EQ Filter Delay

(see

Figure 2.19 on page 2-35 ). Coefficients are selected based on your channel frequency. All frequencies shown are relative to the channel frequency.

Figure 2.17: EQ Frequency Response

EQ frequency response

See Figure 2.17

. This panel displays the frequency response of the active exciter’s EQ filter.

Displays the gain of the filter with respect to frequency of the magnitude of the modulating signal. A dashed line is displayed at the 0 dB level.

Touch on the panel to display a cursor in the approximate area on the trace. The cursor position (frequency and magnitude) is noted in the upper, right-hand corner of the panel.

Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.


Page 2-32 Issue 6.0 2019-01-31



Figure 2.18: EQ Impulse Response

EQ impulse response

See Figure 2.18

. This panel displays the impulse response of the modulator’s EQ filter.

Touch on the panel to display a cursor in the approximate area. The cursor position (filter tap

# and magnitude) is noted in the upper, right-hand corner of the panel. Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.



Issue 6.0 2019-01-31 Page 2-33


Figure 2.19: EQ Filter Delay


EQ filter delay.

See Figure 2.19

. This panel displays the delay of the modulator’s EQ filter across its bandwidth.

Touch on the panel to display a cursor in the approximate area. The cursor position (frequency and delay) is noted in the upper, right-hand corner of the panel. Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.



Page 2-34 Issue 6.0 2019-01-31


AM-AM and AM-PM correction screens.

The exciter linearizes the transmitter’s magnitude

(envelope) path and drive signal by using two correction parameters -

AM-AM Correction

(see

Figure 2.20

) and

AM-PM Correction

(see Figure 2.21 on page 2-37 ), which can be viewed as tool menu panels.

Figure 2.20: AM-AM Correction

AM-AM correction.

This panel displays the amplitude correction being applied to the magnitude signal. The x-axis represents the signal amplitude and the y-axis represents the gain correction applied for a given amplitude value.

Touch on the panel to display a cursor in the approximate area on the trace. The cursor position (LUT index and gain) is noted in the upper, right-hand corner of the panel. Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.



Issue 6.0 2019-01-31 Page 2-35


Figure 2.21: AM-PM Correction


AM-PM correction.

This panel displays the phase correction being applied to the RF drive signal. The x-axis represents the signal amplitude and the y-axis represents the phase shift correction applied for a given amplitude value.

Touch on the panel to display a cursor in the approximate area. The cursor position (LUT index and phase) is noted in the upper, right-hand corner of the panel. Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.



Page 2-36 Issue 6.0 2019-01-31


Figure 2.22: Signal Constellation


Signal constellation.

See Figure 2.22

. In IBOC mode only, the exciter constantly measures the transmitter signal and performs basic demodulation of the digital carriers. The

Signal

Constellation

panel displays the phase and amplitude of the symbols being modulated within an OFDM sub-carrier as dots on a cartesian graph. There are separate screens for each subcarrier. You can select sub-carriers by pressing on the carrier representation in the

SubCarrier

Group MER Spectrum

chart, or by selecting the desired subcarrier from the

SubCarrier Group

Details

list. Typically, the dots will be grouped together around the ideal data points.

Sub-carrier group information is shown in the lower, right section of the screen. Displayed information includes the sub-carrier group name, the bandwidth that the selected carrier group occupies and the modulation error ratio (MER) for the selected carrier group. MER quantifies the performance of the transmitted digital signal as the ratio between the RMS power of the ideal signal and the RMS power of the received signal’s error vector. A higher MER value is characteristic of a smaller error, and therefore a higher quality signal. The MER out of the transmitter is typically better than 20 dB, but can be significantly affected by external influences such as antenna impedance and bandwidth.

NOTE:

When subcarriers are turned off in the Exgine settings, they will still appear in this screen, but the MER will be very high (i.e., 0 to 10 dB).


Issue 6.0 2019-01-31 Page 2-37


Figure 2.23: Lissajous Plot


L and R mode

I and Q mode

Lissajous plot.

See Figure 2.23

. This panel displays a Lissajous figure that represents either L

(left) and R (right) audio content or a representation of the digital modulation signal [I (inphase) and Q (quadrature)]. I and Q will be automatically selected unless you are operating in stereo mode or not operating digital. Left and right audio content is displayed for all other audio sources.

The plot consists of a group of sequential samples to allow signal analysis. In L and R mode, the L+R portion of the signal tends to dominate the plot, resulting in the majority of samples appearing in the lower, left and upper, right quadrants. In I and Q mode, signals that are of equal frequency and 90 degrees out-of-phase result in a circular display.


Page 2-38 Issue 6.0 2019-01-31


Figure 2.24: Smith Chart


Zoom

In

Zoom

Out

Cursor

Left

Cursor

Right

Minimize

(Maximize)

Close

Smith chart.

See Figure 2.24

. The Smith Chart allows you to visualize the impedance of the

transmitter’s load as seen at the combiner, as a function of frequency. The impedance shown on the Smith Chart is normalized to the combiner input impedance. The ideal load is therefore

1 +j0 ohms, which implies a perfect 50-ohm load is being applied to the output of the transmitter.

Touch on the panel to display a cursor in the nearest area on the trace showing the normalized impedance plot line. The cursor position (impedance and frequency) is noted in the upper, right-hand corner of the panel. Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.

Use the left and right buttons as fine adjustments.

Use the zoom in (+) and zoom out (-) buttons to size the chart between 100% and 1000%.

Issue 6.0 2019-01-31 Page 2-39



Figure 2.25: Modulation Levels

Modulation levels.

See Figure 2.25

. Bar graphs display the percentage of L+R modulation,

PDM (magnitude) and I/Q modulation for the transmitter. I/Q bar graphs will show levels in

DRM or IBOC mode only.

The level shown in yellow represents the currently measured peak modulation level, with the

RMS level shown in green. An actual RMS value is displayed below the meter).

The red markers represent the most recently recorded maximum peak level. The actual peak values are displayed in red below the meter. For L+R and I/Q modulation, both positive and negative peaks are shown.

There are no interactive tools (cursors, fine/coarse adjustments) for this display.

Page 2-40 Issue 6.0 2019-01-31


Figure 2.26: Audio Inputs


Audio inputs.

See Figure 2.26

. Bar graphs display the amplitude (in dB) of the audio inputs

selected in the preset.

The level shown in yellow represents the currently measured peak amplitude, with the RMS level shown in green. An actual RMS value is displayed below the meter).

The red markers represent the most recently recorded peak level. The actual peak value is displayed in red below the meter.

There are no interactive tools (cursors, fine/coarse adjustments) for this display.

Issue 6.0 2019-01-31 Page 2-41


Figure 2.27: Power Distribution Graph


Cursor

Left

Cursor

Right

Minimize

(Maximize)

Close

Power distribution graph.

See Figure 2.27

. The exciter measures the relative power levels of

the signal and determines the probability of exceeding a given power level, relative to the average power. The data is plotted in the

Power Distribution Graph

as a CCDF

(complementary cumulative distribution function). The x-axis displays the relative power level in dB, with the reference representing the average power. The y-axis displays the probability of exceeding that power level. This graph can be used to assess the distribution of a given signal, and provides an indication of the amount of peak power capability required.

Touch on the panel to display a cursor in the approximate area on the trace. The cursor position (power gain and probability) is noted in the upper, right-hand corner of the panel.

Touch in other areas of the tool menu panel to provide a coarse adjustment of the cursor position.



Page 2-42 Issue 6.0 2019-01-31


Meters page - viewing real-time meters

The AUI displays many metered parameters on the

Home

page (right side) ( Figure 2.28

). This section includes the following topics:

•

“Describing the meter display”

•

“Accessing meter information” on page 2-45

•

“Saving meter list” on page 2-49

Figure 2.28: Meters Page

Information

Buttons

View Save

Selected

Meters arrow

Describing the meter display

The meters displayed in the AUI are active meters selected for display.

Each meter is a colourcoded bar with minimum and maximum values. The current value for a meter is indicated by an arrow on the colour-coded bar, as well as a displayed value below the meter.

• A parameter value in the green section of a meter bar indicates the parameter is within the range for normal operation.

• A parameter value in the yellow section (as applicable) of a meter bar indicates the parameter is still within an operational range, but is approaching design limitations.

• A parameter value in the red section of a meter bar indicates the parameter is outside normal operating conditions.

• The number of meters that can be added to this list is limited only by the number of meters available for selection.

Issue 6.0 2019-01-31 Page 2-43


Accessing meter information

• To delete a meter from the

Home

page, press the X in the left-hand corner of the meter in the “Meters” window (right side).

• To review all the meter options, press the information button (magnifying glass) at the top of the meters panel ( Figure 2.29

).

Figure 2.29: Meters List View Window

X to close

Buttons to access summary screens

Procedure to identify meter information on a specific transmitter sub-system:

1. Open the “Meters List View” window, which organizes the available meters by transmitter sub-system.

• Controller

- ( Figure 2.30 on page 2-46 )

• Exciter A


• Exciter B


• Rack 1 4 (Multiple Racks supported, as applicable) (

Figure 2.32 on page 2-47

). Additionally, each

Rack

includes a list of

PM

(power module) sub-systems, representing the RF power modules in each rack. Each power module can be selected to show its meters.

• Modules - Rack 1 - 4 (Multiple Racks supported, as applicable) ( Figure 2.33 on page 2-48 )

Page 2-44 Issue 6.0 2019-01-31


2. To view the summary screen of each device type: Under “Transmitter Layout”, press the information button ( i ) adjacent a device type (


summary screen shows all available meters in tabular format.

,

Figure 2.31 on page 2-47 , Figure 2.32 on page 2-47

and Figure 2.33 on page 2-48 ). The

NOTE:

When a meter value is updated, a blue box briefly appears around that value.

Typically, updates occur every one or two seconds.

3. To choose individual meters for display in the “Meters” window of the

Home

page:

Select the device type name in the

Transmitter Layout

panel and select the checkbox next to the desired meters shown in the

Relevant Meters

panel. If the

Relevant Meters panel contains more than one page of information, then use the scroll bar (right side) to find the desired meter.

Figure 2.30: Meters - Information Display for Controller

Issue 6.0 2019-01-31 Page 2-45


Figure 2.31: Meters - Information Display for the Exciter


Figure 2.32: Meters - Information Display for Rack 1

Page 2-46 Issue 6.0 2019-01-31


Figure 2.33: Meters - Information Display for Modules - Rack 1

* PM 1-10 shown

Press to view previous ten modules

Press to view next ten modules

NOTE:

Power modules are numbered (e.g., PM1, PM2, etc.) in the order they are plugged in, which is not necessarily the same as their physical location in the transmitter. To match a meter or an alarm with a specific power module, match the hexidecimal serial address (see

Figure 2.33

, shown within the

Front Panel Inhibit

button) with that shown on the label on the front of the power module.

On the modules summary screen ( Figure 2.33

), meters for only ten power modules are shown on a page. For transmitters with more than ten power modules, use the left and right arrow buttons on the bottom of the page to cycle through the groups of ten power modules.

Individual power modules can be directly inhibited by pressing their

Front Panel Inhibit button.

Issue 6.0 2019-01-31 Page 2-47


Saving meter list

NOTE:

Meter lists are associated with user accounts. Lists saved in this screen are only displayed in the current user account. Setting a list as default will define the meters that will appear when logging into the current account (or after an ac power interruption in the local AUI if this is the default user account).

To save meter specifics for display on the

Home

page:

1. Open the

Meter List Save

window from the

Home

page using the floppy disk button

(

Figure 2.34

).

• Press

Save As to save the currently displayed meters. Enter a name in the

Layout

Name

entry box and press

OK

.

• Press

Delete

to discard the selected meter list.

• Press

Set Default

to set the selected meter list as the default for the current user account.

• Press

Save

to overwrite the selected meter list with the currently displayed meters.

• Press

Load

to display the meters saved under the currently selected meter list in the

Meters

panel on the right-hand side of the

Home

page.

Figure 2.34: Meters List Save Window

Page 2-48 Issue 6.0 2019-01-31


Presets - editing operational settings

The

Presets

page (see

Figure 2.35

) allows you to view operational data (power level, frequency, mode, program input characteristics), plus create and control preset settings. You can create up to 61 presets or edit existing presets.

To view the

Presets

page, select

Presets

in the

Menu

page.


•

“Activating Presets” on page 2-51

•

“Editing or Creating Presets” on page 2-51

•

“Loading Presets” on page 2-52

•

“Changing preset schedules” on page 2-52

•

“Understanding the preset tabs” on page 2-53

•

“Preset examples - IBOC preset” on page 2-59

•

“Preset examples - Analog preset” on page 2-59

•

“Preset examples - IBOC preset with analog backup” on page 2-60

Figure 2.35: Presets Page - General Tab

Active preset

Issue 6.0 2019-01-31

Access from the Menu page

Page 2-49


NOTE :

When asked to enter a value in a field, an error message may appear (red text at the bottom of the screen) showing the limits of the requested value. Re-enter the desired value, ensuring it falls within the limits shown.

For example:

Output Power - Valid values: 0.000kW to 55.000kW

Activating Presets

In the

Transmitter block in the AUI’s top banner, click the bar that contains the active preset name and the drop-down arrow (see Figure 2.36

). The

Activate Preset

window will appear, which contains a list of all preset options. Click and highlight the desired preset and click the

Activate

button to enable the preset as the transmitter’s active preset. Click the

Cancel

button to close this window.

Figure 2.36: Activate a Preset

CLICK HERE TO

DISPLAY PRESET

SELECTION

OPTIONS

Editing or Creating Presets

When the

Presets

page (see Figure 2.37 on page 2-57 through

Figure 2.42 on page 2-58 ) is opened from the menu, the

Current Settings

of the transmitter are displayed. They define the current operational state of the transmitter.

Current Settings

can be edited and then immediately activated by pressing the

Save

button.

Page 2-50 Issue 6.0 2019-01-31


To edit a saved preset, you must load that preset from the

Presets

page (see

“Loading Presets” on page 2-52 ). If the edited preset was active before it was edited, saving the preset will update

the preset, but the

Current Settings

will not change. To update the operation of the transmitter, re-activate the preset through the top banner (see

“Activating Presets” on page 2-

51

).

In the top banner, an asterisk (*) appears next to the preset name when the

Current Settings have changed since the last preset was loaded.

Current Settings

are not saved through an ac power cycle; when the transmitter recovers from an ac power loss, it loads the preset that was last activated.

On the

Presets

page, an asterisk (*) appears next to the preset name in the header when there are unsaved changes to the preset.

When changes are complete, click the

Save

button and then click the

Save Preset

window’s

Save

button to enable the changes. If you are creating a new preset, you can also enter a new name (e.g., Preset 4 - IBOC) in the preset window before clicking the

Save

or

Save New button.

Parameters that can be edited are discussed in detail in “Understanding the preset tabs” on page 2-53

.

To remove a preset, select it and press the

Delete

button.

To ignore any changes, press

Cancel

to return to the

Presets

page.

NOTE:

See

“Preset examples - IBOC preset” on page 2-59

,

“Preset examples - Analog preset” on page 2-59

,

“Preset examples - IBOC preset with analog backup” on page 2-60 and “Preset examples - DRM preset” on page 2-60

for sample presets for different transmission modes.

Loading Presets

When you enter the

Presets

page, the

Current Settings

of the transmitter are displayed.

See

“Editing or Creating Presets” on page 2-51 for more information on

Current Settings

. If you do not wish to change the current operational state of the transmitter, use the

Load

button on the left side of the

Presets

page to display a window containing a list of other presets. Select the desired preset and click the

Load

button to view or enable editing of the preset. Click the

Cancel

button to close this window.

Changing preset schedules

You can program a preset schedule for the transmitter, using the

Scheduler

page (see “Preset

Scheduler” on page 2-65

).

Issue 6.0 2019-01-31 Page 2-51


Understanding the preset tabs

The

Presets

page consists of tabs across the top with functions on the left-side and parameters displayed in the center and right-side of the window. A separate display appears for each of the following tabs:

General

( Figure 2.35 on page 2-50 )

• Preset Name -

this identifies the current preset. You must load a preset to directly edit this field (see

“Loading Presets” on page 2-52

).

• Output Power - set the output power level (in kW)

• Overall Mode - set the overall transmission mode. Options are:

– Analog AM: transmits a carrier, amplitude modulated with audio. Audio settings are selected in the

Analog Settings tab.

– DRM: transmits a DRM OFDM signal using the I/Q stream from a DRM modulator connected to the desired AES input. Modulation settings are selected in the Digital Settings tab.

– DRM+AM: Also known as simulcast, transmits a carrier, amplitude modulated with audio and a

DRM OFDM signal in either an upper or lower channel. AM settings are selected in the Analog

Settings tab and DRM settings are selected in the Digital Settings tab. In this case, if balanced analog audio input is used for AM modulation, AES2 input (Digital AES input) must be used for I/Q stream from the DRM modulator. If AES is used for AM modulation, either AES input may be used for either input (AM modulation and DRM I/Q stream).

– IBOC: transmits an AM IBOC standard signal (carrier, amplitude modulated with audio and upper and lower sidebands of OFDM IBOC carriers). Requires an Exgine to be installed in the transmitter that is receiving modulation information from and Exporter. Both the AM signal and IBOC carriers are received in the I/Q stream from the Exgine. Modulation settings are selected in the Digital

Settings tab.

– IBOC+AM: The transmitted signal in this mode is identical to IBOC mode. In this mode, the information for the OFDM carriers is received from the Exgine and the AM information is received through an audio input in the transmitter. In this mode, the AM audio signal cannot be connected to AES2; it must be connected to Bal Anlg Audio or AES1. AM settings are selected in the Analog

Settings tab. IBOC carrier modulation settings are selected in the Digital Settings tab.

• Configuration -

select the pre-correction configuration (see “Precorrection Settings page” on page 2-

104

)

Page 2-52 Issue 6.0 2019-01-31


NOTE:

Available settings on the

Analog Settings

and

Digital Settings

tabs are shown/hidden based on the

Overall Mode

setting. Not all settings are available in all modes.

Analog Settings


• AM Source - select the audio source for the AM signal. Options are:

– Unused

– Balanced Analog (connector J12 on A11A1)

– AES1 (connector J11 on A11A1)

– AES2 (connector J10 on A11A1)

– Audio Player/AES1: Requires installed USB sound card option. Plays audio player playlist through single-board computer USB port; This USB port must be connected to the USB sound card, the output of which should be connected to the AES1 input.

– Audio Player/AES2: same as above for ASE2 input.

• Format -

Options are:

– AM Carrier: transmits carrier only; ignores audio inputs.

– Mono L+R: adds L+R channels on AES signal.

– Mono L: transmits L channel of AES signal or Bal Analog.

– Mono R: transmits R channel of AES signal.

– Stereo C-QUAM: uses amplitude and phase modulation over AES, to transmit a stereo AM signal.

• Filter Type - selects a filter to be applied to the input audio signal. Options are:

– None: no filter is applied (default).

– Brick Wall: applies a low pass filter with a very sharp cutoff and a 6 dB bandwidth defined by the

Filter Bandwidth setting (between 1 kHz and 10 kHz).

– Minimum Overshoot: applies a Gaussian low pass filter with a very gentle rolloff and a 3 dB bandwidth of 5.13 kHz. Used to minimize ringing of the modulator filter with extremely high rate of change input signals (e.g., square waves). Typically used only for testing purposes.

• NRSC-1 Preemphasis - applies a NRSC-1 pre-emphasis curve to the input audio signal. Default is Off.

• Dynamic Carrier Control - selects the DCC mode, as applicable. Options are None, AMC, EAMC, DAM or DAM Full. Default is None. When a DCC mode is selected, a Max DCC Compression level can also be entered. In addition, when the DCC mode is set to EAMC, the EAMC gain sets the gain applied to the carrier power when no modulation is applied (maximum is 1.76 dB), and the Max Carrier Timeout will cause the carrier power to drop to the setpoint after two (2) minutes with no modulation applied.

See

“Selecting the DCC mode” on page 2-61 for more information on each mode.

Issue 6.0 2019-01-31 Page 2-53


• AMSS - Amplitude Modulation Signalling System. Allows low-bit rate data to be transmitted with the

Analog AM signal. Contact Nautel for assistance with using AMSS. Default is Disable.

NOTE : The AMSS field is displayed only when the Overall Mode is Analog AM or DRM+AM.

• AES Input Level - Defines the AES input level (in dBFS) that will result in 100% modulation depth. Set between -30 dBFS and 0 dBFS, according to the input signal level.

• Balanced Analog Input Level - Defines the Bal Analog input level (in dBm) that will result in 100% modulation depth. Set between -20 dBm and +12 dBm, according to the input signal level.

Digital Settings

( Figure 2.38 on page 2-57 through

Figure 2.41 on page 2-58 )

For DRM and DRM+AM modes:

• Data Source - Select the source for the OFDM (digital) signal (AES1 or AES2).

• AES input Level - Defines the full-scale AES input level (in dBFS) for the I/Q stream. Set between -30 dBFS and 0 dBFS

• DRM Bandwidth - Selects the bandwidth of the DRM signal to be transmitted. This setting only sets the parameters of the mask shown on the spectrum analyzer. Transmitted signal bandwidth is set at the I/Q source (DRM modulator). Select 4.5 kHz, 5 kHz, 9 kHz, 10 kHz, 18 kHz or 20 kHz.

• Frequency Offset - Sets the frequency offset between the AM signal and the DRM carriers. Set between

-10 kHz and +10 kHz. In DRM mode, allows adjustment of the location of the OFDM carriers with respect to the transmitter’s carrier frequency.

• Power Differential - In DRM+AM mode only, sets the difference between the AM carrier power and the

RMS power of the DRM carriers. The level is approximately based on the input signal to the exciter and may require adjustment to obtain the exact level. Set between 0 dB and 40 dB.

• Envelope Conditioning -

In DRM mode only, applies a proprietary correction to the envelope to improve spectral performance, but will negatively affect MER.

Page 2-54 Issue 6.0 2019-01-31


For IBOC and IBOC+AM modes:

• IBOC Service Mode - In IBOC mode only, select the MA1(hybrid) or MA3 (all-digital) service mode

• Enhanced Carriers - select Low, High or Disabled

• Upper Primary Level Adjust - Adjusts the power level of the upper sideband within the range of -30 dB and -+10 dB. Should be zero by default.

• Lower Primary Level Adjust - Adjusts the power level of the lower sideband within the range of -30 dB and -+10 dB. Should be zero by default.

• Analog Gain - In IBOC mode only, selects a linear scale factor (between 0 and 4) that scales the analog modulation level with respect to the carrier level. Normally set to 1.0 with a 0 dBFS audio signal applied to the Exporter.

• Digital Carriers - select On or Off

• Analog Bandwidth - In IBOC mode only, select 5kHz, 8kHz or Bypassed

• Analog Transmission - In IBOC mode only, select On or Off

Audio Loss


• Mod Loss Timeout - Determine if an action should be taken on the loss of a modulating signal. Select

Enabled or Disabled. Default is Disabled. If Enabled, the following sub-fields appear:

– Action: select the action to take on the loss of a modulating signal. Select Alarm Only (no resulting action), Inhibit (inhibits the RF output, fans and B+ voltage until the audio returns) or Change

Preset (changes the active preset).

– Mod Loss Preset: displayed only if Action is set to Change Preset. Select the preset from the dropdown list that will activate upon the loss of a modulating signal.

– Timeout Minutes: sets the delay, in minutes, between audio loss detection and the resulting action.

Enter a value between 0 and 255 minutes.

– Timeout Seconds - sets the delay, in seconds, between audio loss detection and the resulting action. Enter a value between 0 and 59.9 seconds

– Threshold - sets the threshold for audio loss detection. Enter a value between 0 and 100%

Issue 6.0 2019-01-31 Page 2-55


Figure 2.37: Presets - Analog Settings


Figure 2.38: Presets - Digital Settings (Overall Mode = DRM)

Figure 2.39: Presets - Digital Settings (Overall Mode = DRM+AM)

Page 2-56 Issue 6.0 2019-01-31


Figure 2.40: Presets - Digital Settings (Overall Mode = IBOC)

Figure 2.41: Presets - Digital Settings (Overall Mode = IBOC+AM)

Figure 2.42: Presets Tabs - Audio Loss

Issue 6.0 2019-01-31 Page 2-57


Preset examples - IBOC preset

The following examples shows you how to set presets for the IBOC applications with typical values:

1. Enter Output Power field with desired power level.

2. Set Overall Mode to

IBOC

.

3. Under

Digital Settings:

• set IBOC Service Mode to MA-1 (Hybrid)

• set Enhanced Carriers to Low

• set Digital Carriers to On

• set Analog Bandwidth to 5kHz

• set Analog Transmission to On

Preset examples - Analog preset


2. Set Overall Mode to Analog AM.

3. Under

Analog Settings:

• set AM Source as required (typically Analog AES).

• set Format as required (typically Mono L + R).

• enter Bandwidth field as required.

• set Preemphasis to Off (typically).

• set Dynamic Carrier Control to None (typically).

Page 2-58 Issue 6.0 2019-01-31


Preset examples - IBOC preset with analog backup

1. Set two presets similar to the two previous examples.

2. Under

Audio Loss

, set Mod Loss Timeout to Enabled . Several other selectable fields will appear.

3. In the Action field, select Change Preset from the drop-down list. The Mod Loss Preset field will appear.

4. In the Mod Loss Preset field, select the desired preset from the drop-down list. This is the preset that will activate upon a modulation loss.

5. Set the remaining mod loss timeout fields. See

“

Audio Loss

” on page 2-56

.

6. Save the preset with the desired name (new or existing). See “Editing or Creating

Presets” on page 2-51 .

Preset examples - DRM preset


2. Set Overall Mode to DRM .

3. Under

Digital Settings:

– set Data Source as required ( AES 1 or AES 2 ).

– set DRM Bandwidth as required.

– set the AES Input Level for the selected data source to the appropriate level for the

DRM modulator.

Issue 6.0 2019-01-31 Page 2-59


Selecting the DCC mode

The NX15/NX25 is capable of several DCC modes (see “Editing or Creating Presets” on page 2-51

), each with varying performance in terms of energy savings and effects on the reproduced signal. The selectable options are:

• AMC (see

Figure 2.43

)

• EAMC (see Figure 2.44 on page 2-62

)

• DAM (basic) (see Figure 2.45 on page 2-62 )

• DAM Full (see

Figure 2.46 on page 2-63 )

• DCC1 (see


)

Once a DCC curve has been selected, the desired Max DCC Compression level can be entered.

This setting defines the maximum reduction in carrier (or carrier and sideband) power for a given curve. Standard compression settings are as follows:

• AMC and EAMC modes: 3 dB

• DAM, Full DAM and DCC1 modes: 4.44 dB

Figure 2.43: AMC

Page 2-60 Issue 6.0 2019-01-31


Figure 2.44: EAMC


Figure 2.45: Basic DAM

Issue 6.0 2019-01-31 Page 2-61


Figure 2.46: Full DAM


Figure 2.47: DCC1

Page 2-62 Issue 6.0 2019-01-31


Guidelines for selecting the DCC mode:

Observe the following guidelines when selecting the DCC mode for your application.

AMC mode (see Figure 2.43 on page 2-61 ) should work well for most broadcasters and is

generally recommended if you have an IBOC transmission. It has several advantages over the other modes:

• It tends to save the most power when used with a heavily processed audio signal and asymmetrical modulation.

• It does not affect the modulation depths of the received signal, so the station’s sound should not change.

• It performs the reduction in power in such a way that it tends to be masked by the audio.

If AMC is not being used, consider DAM mode as a second choice, although the power savings will be significantly less. If the station is operating with less audio processing, or has more silent periods, the DAM algorithms will tend to save more power. However, the basic DAM characteristic will impact the audio quality of the station. In IBOC mode, DAM will significantly reduce the audio quality of the station as it will increase the impact of the IBOC on the analog. It may also make it more difficult for the transmitter to meet the spectral mask, by making the transmitter operate at a much higher modulation depth and effectively increasing the level of the digital carriers relative to the analog.

Issue 6.0 2019-01-31 Page 2-63


Preset Scheduler

If the scheduler is enabled (see

“Enabling the Scheduler” on page 2-69

), you can program a yearly preset schedule for the transmitter. Use the

Scheduler

page (see Figure 2.48

) to set the dates and times at which presets take effect. You can define up to 63 scheduler rules. To view the

Scheduler

page, select

Scheduler

from the

Menu

page options.

NOTE :

The remote AUI’s Scheduler button will not display when the

System Settings ->

Exciter Clock Calibration -> Sync Source is set to

Combiner

. Use the associated combiner cabinet’s AUI Scheduler button to configure the system schedule.

WARNING:

When the scheduler is active it can override external power control commands if a scheduled event at higher power occurs. In the case of tower or antenna work requiring reduced power, it is best to completely disable the scheduler before proceeding.

Figure 2.48: Scheduler page

Page 2-64 Issue 6.0 2019-01-31


The left-hand side of the

Scheduler

page displays a monthly calendar (e.g., April 2015). Use the

<<

and

>>

buttons to navigate between months. Use the |

<

and

>|

buttons to navigate to the beginning and the end of the schedule.

The right-hand side of the

Scheduler

page contains a

Rules

section and a

Daily Events

section.

All programmed rules are displayed in the

Rules

section. Clicking on a specific date in the monthly calendar displays the rules, as applicable for that day, in the

Daily Events

section.

Editing scheduler rules

When you click in the

Rules

list, you have the option to edit or delete an existing rule, or to create a new rule (up to a maximum of 63 rules). Click the

New

or

Edit

button to display the

Rule Explorer

window (see Figure 2.49

). Click

Delete

to remove a rule from the list.

Figure 2.49: Rule Explorer window

NOTE :

It is not possible to schedule an RF OFF state through the scheduler. However, it is possible to “simulate” an RF OFF condition by creating a preset with a 0W setpoint. Once the

0W preset has been activated, after 10 seconds, the transmitter will shut down the RF power modules, fans and B+ power supply, emulating an RF OFF state, but the transmitter will still indicate RF ON.

When a new preset is later activated with a non-zero power setpoint, the transmitter will resume operation as specified in the active preset.

Issue 6.0 2019-01-31 Page 2-65


Use the

Rule Explorer

window as follows:

• In the

Time of Year

section, set the start (From:) and end (To:) dates for the rule.

Start to end dates must be less than one year apart. Rules are automatically repeated every 365 days (366 days in a leap year) such that schedules are the same year-toyear. Therefore, a single rule cannot span more than 365 days (366 days in a leap year).

• In the

Days

section, select the days of the week on which the rule will apply. Rules are automatically repeated for every day indicated in the Day section during the time frame outlined in the Time of Year section.

• In the

Time of Day

section, set the (From:) time (hours, minutes and seconds) for the rule. Rules take effect at the (From:) time on every day scheduled per the

Days and

Time of Year sections, and will remain effective until another rule is applied or the transmitter’s settings are manually changed (remote or local).

• If the rule is to repeat during a single day, use the (Repeat:) field to indicate how often the rule should take effect each day of the schedule.

• The (To:) time in the

Time of Day

section is ONLY applicable when the (Repeat:) field is non-zero, and sets when the repeats will stop on the

Time of Day

schedule

(see

“Scheduler Rule Example 2” on page 2-68 ). If you are trying to schedule a

single event to occur at a particular time each day (or on a single day) and have left the (Repeat:) field blank, the event will trigger at the (From:) time, and the (To:) time is irrelevant.

• If the

Self Delete

box is checked, the event will never repeat after the first time it occurs (specified by the (From:) fields in the

Time of Year

and

Time of Day sections), regardless of whether the values in the

Time of Year, Days

and

Time of Day sections outlined above indicate repetition.

• Use the drop-down menu to select the preset (e.g., Current Settings) for the rule.

The preset’s power, mode and frequency are displayed below the preset.

• Click the

Save

button to store the rule in the scheduler or the

Cancel

button to return to the

Scheduler

page.

Page 2-66 Issue 6.0 2019-01-31


The following examples illustrate how to interpret the programming of a rule:

Scheduler Rule Example 1

From Date:

To Date:

March 3

April 7

Days: SUNDAY, unchecked.

From Time:

To Time:

Self Delete:

6:15:00

00:00:00

Repeat: 00:00:00

UNCHECKED

Preset: Preset

Translation: Every Sunday, Tuesday, and Wednesday between March 3 and April

7 of any given year, this rule will take effect. On Mondays, Thursdays, Fridays and Saturdays, the rule will not take effect. At 6:15 in the morning, the preset will change to Preset 1.

Scheduler Rule Example 2

From Date:

To Date:

March 3

April 7

Days: SUNDAY, unchecked.

From Time:

To Time:

Self Delete:

6:15:00

15:12:00

Repeat: 00:12:34

UNCHECKED

Preset: Preset

Translation: Every Sunday, Tuesday, and Wednesday between March 3 and April

7 of any given year, this rule will take effect. On Mondays, Thursdays, Fridays and Saturdays, the rule will not take effect. At 6:15 in the morning, and every 12 minutes and 34 seconds thereafter, until

15:12 in the afternoon, the preset will change to Preset 1.

Issue 6.0 2019-01-31 Page 2-67


Enabling the Scheduler

You can enable or disable the scheduler by clicking the

Scheduler

button in the

Date & Time section (see Figure 2.50

).

Figure 2.50: Enabling/disabling the scheduler

Top banner of the AUI

Scheduler field (toggles Off/On) or

When

Scheduler: ON

appears in green, the transmitter will follow the

Scheduler

settings.

When S cheduler: OFF

appears in red, the transmitter will stop following the schedule and the active preset will be the preset that was operating when the scheduler was disabled.

Page 2-68 Issue 6.0 2019-01-31


Status - viewing transmitter status

You can view the operational status of the transmitter using the

Status

Page (see Figure 2.51

).

This page shows current active alarms to aid in fault diagnosis.


•

“Viewing alarm details” on page 2-71

•

“Status button colour indications” on page 2-71

•

“Resetting alarms” on page 2-71

Figure 2.51: Transmitter Status Page

Issue 6.0 2019-01-31 Page 2-69


Viewing alarm details

The

Transmitter Status

page displays a table that lists the active alarm details under the following columns:

•

Device

- identifies the alarms by their originating device (e.g., Controller, Exciter A, etc.)

•

Alarm

- identifies the type of alarm (alarm name).

•

Level

- identifies the severity level of the alarm

= low (RF output not affected)

= medium (RF output may be reduced)

= high (RF output may be inhibited)

Status button colour indications

• When the

Status

button is red, one or more active alarms are indicating that the transmitter may be in an ‘off-air’ state.

• When the

Status

button is yellow, one or more active alarms are indicating that the transmitter is still ‘on-air’, but may be at reduced power.

• When the

Status

button is green, no alarms are being reported and the transmitter is operating normally.

Resetting alarms

When an alarm is present, use the

Reset

button ( Figure 2.52

), at the bottom of any AUI screen, to clear any latching alarms that are holding the transmitter in an “off-air” state. If the offending alarm has cleared, then the transmitter should resume operation.

Figure 2.52: Logs - Reset

Page 2-70 Issue 6.0 2019-01-31


User Accounts

The

User Accounts

page allows you to set up user accounts and assign different levels of access to the transmitter control operations (see Figure 2.53

). Any user may change their password, but only

Administrators

may add users and edit permissions.

You access the

User Accounts

page from the

Menu

page in the bottom panel of the AUI.


•

“Types of users” on page 2-73

•

“Changing the password” on page 2-74

•

“Removing an account” on page 2-76

•

“Setting autologin status (local only)” on page 2-76

•

“Removing an account” on page 2-76

Figure 2.53: User Accounts Page

In the

User Accounts

page, users are listed in a panel on the left side of the screen, operations appear along the bottom and settings appear in the center.

Issue 6.0 2019-01-31 Page 2-71


Figure 2.54: User Accounts Page Layout

Auto Login

Administrator

Full Control

View Only

Custom


Users

Permissions

Types of users

You assign a user type to identify the permissions available to that user. All users have permission to change their own username and password (see

Figure 2.54

) but there are other realms of permission. The AUI operates with the following user types:

• View Only : Can monitor equipment data only, with no administrative or control functions.

• Full Control : Can monitor and control equipment, with no administrative functions.

• Administrator : Can perform all functions. Only an Administrator can edit user information.

• Custom : Administrator can customize the user permissions by manually selecting the permission levels.

Page 2-72 Issue 6.0 2019-01-31


Adding a user

You must be an Administrator to use this function.

Procedure to add a user (see


):

1. Open the

User Accounts

page.

2. Press

Add

(bottom of the screen) to open a small window.

3. Beside Username , enter a name that identifies the new user, and press

OK

.

4. Select the new user to edit the settings.

5. Beside User Type , press the arrow to reveal a drop-down menu and select a type of user.

If you select Custom as the type of user, then go to the Permission section of the screen

and mark individual permissions (see “Changing permissions” on page 2-75 ).

6. Press

Apply

to confirm your entries and create a new user or press

Cancel

to ignore your entries and exit the small window without creating a new user.User

Changing the password

Any user can change their own password. You must be an Administrator to change another user’s password.

Procedure to change a password (see Figure 2.54 on page 2-73 ):

1. Open the

User Accounts

page.

2. Select a user from the “List of Users”.

3. Press

Change Password

(bottom of the screen) to open a small window.

4. Beside Old Password , enter the existing password.

5. Beside New Password , enter a new password.

6. Beside Confirm Password , retype the new password.

7. Press

Apply

to replace the old password with the new one and exit this menu.

Issue 6.0 2019-01-31 Page 2-73


Changing permissions

You must be an Administrator to edit this function.

All users have permission to change their own username and password (see

Figure 2.54

). You

can customize the permissions assigned to a user or simply pick a predetermined set of permissions based on the user type.

Procedure to change user permissions (see Figure 2.54

):

1. Open the

User Accounts

page.

2. Select a user from the “List of Users” to display the permissions for that user in the center of the “Permissions” window. The permissions associated with the selected user are identified with a checkmark.

3. Press on User Type to reveal a drop-down menu and select a new type of user.

4. If the user type in

Step 3

is

Custom

, set individual permissions. Under “Permissions”, place a checkmark beside each permission that you want to associate with the user.

The boxes work like a toggle - click in the circle to place a checkmark and click again to remove the checkmark. Choose one or more of the following options:

• Activate/Modify Preset - Allows the user to modify presets and change the active preset.

• Power Control - Allows the user to change the power setpoint of the transmitter.

• Manage Power Lockouts - Allows the user to modify and select the active power lockout.

• Delete Logs - Allows the user to remove log entries.

• RF On/Off - Allows the user to turn the RF output on and off..

• All Other Settings - Allows the user to adjust all settings not mentioned above, except for administrating user accounts.

5. Press

Apply

to assign the new permissions to the selected user.

Page 2-74 Issue 6.0 2019-01-31


Setting autologin status (local only)

You must be an Administrator to edit this function. This setting defines which account will be automatically entered on the local AUI. If no account is set for Auto Login , the login screen will appear when the local AUI boots. Remote users always require a login. There can only be one account that is set for Auto Login .

Procedure to change your auto login status (see Figure 2.54

):

1. Open the

User Accounts

page.


3. Beside Auto Login (Local only) , press the checkbox to activate this feature. When this feature is activated, the local user is automatically logged into the local transmitter with all the rights and privileges assigned to that user.

4. Press

Apply

to apply this change to the user.

Removing an account

You must be a Administrator to edit this function.

To remove a user account (see

Figure 2.54

):

1. Open the

User Accounts

page.


3. Press

Delete

to delete the user from the list.

Issue 6.0 2019-01-31 Page 2-75


User Settings

The

User Settings


) allows you to modify various custom user settings such as network settings and email notification settings.

Figure 2.55: User Settings Page


•

“Setting up the Network” on page 2-78

•

“Email Configuration” on page 2-80

•

“Notifications” on page 2-82

•

“Exgine Network Settings” on page 2-84

•

“SNMP Configuration” on page 2-86

•

“Critical Parameters” on page 2-88

•

“Time Setup” on page 2-89

•

“NTP Servers” on page 2-91

•

“Nautel Phone Home” on page 2-93

•

“Setting call sign/ID” on page 2-94

Page 2-76 Issue 6.0 2019-01-31


Setting up the Network

The

Network Setup


) allows you configure parameters for connecting the

AUI to your network. Modify network settings as follows:

Figure 2.56: User Settings - Setting up the Network

1. Open the

User Settings

page by pressing

Menu/User Settings

in the

Home

page.

2. Select the Network Setup option (left-side of the screen) to display related information and associated parameters in the center of the screen.

3. Enter the following parameters:

• Mac Address -

Displays a number that serves as unique network adapter identifier. This is set by the manufacturer and is displayed for informational purposes only. It may be necessary to use this number to allow the AUI to access your network.

• DHCP or Static IP -

Defines whether the IP Address, Subnet Mask, Default Gateway, Default

Nameserver and Alternate Nameserver will be provided manually (static IP) or automatically by the access point (i.e., a router) through DHCP. In either case, the access point must be configured with the correct settings, which match the settings on the AUI in order for the AUI to access the network. Your parameter selection affects other parameter entries. If Static IP was selected, enter the IP Address, Subnet Mask and Default Gateway.

Issue 6.0 2019-01-31 Page 2-77


• Subnet Mask Masks an IP address, and divides the IP address into network address and host address (normally set to 255.255.255.0)

• Default Gateway - Defines the address of the network access point.

• Default Nameserver - Address that identifies the DNS host

• Alternate Nameserver- Redirects the name server

• Port Number - Used to identify the senders and receivers of messages. Defaults to 3501.

NOTE:

If the transmitter is connected to the Internet via a firewall, and remote access is required, the port number for external incoming connections that are to be routed to the transmitter MUST be the same as the port number that the transmitter listens to on the internal network.

• Status Identifies the network status (Running or Not Running). Running indicates the transmitter is successfully connected to the network. Not Running indicates the transmitter is not communicating on the network, possibly due to a disconnected cable, incorrect network settings, a malfunctioning network device, etc..

4. Press

Apply

to accept your entries.

Page 2-78 Issue 6.0 2019-01-31


Email Configuration

The

Email Configuration


) allows you to configure email parameters (e.g.,

server name and port number).

Figure 2.57: User Settings - Configuring Email

Procedure to configure emails:

1. Open the

User Settings

page by pressing

Menu > User Settings

in the

Home

page.

2. Select the

Email Configuration

option (left-side of the screen) to display related information and associated parameters in the center of the screen.

3. Enter the following parameters:

• Email Server - The email server name depends on your network setup variables (see

“Setting up the Network” on page 2-78 ). If your network is set to

Static IP , then enter your outgoing mail server’s IP address. If your network is set to DHCP , then enter your outgoing mail server’s IP address or DNS.

NOTE :

The email server’s domain (e.g., “.com”, “.ca”, “.info”, etc.) must be two (2), three (3), four (4) or six (6) characters in length. Other character lengths are not accepted .

Issue 6.0 2019-01-31 Page 2-79


• Port Number - Enter the information that will identify the senders and receivers of messages. Typically, this is set to 25 for SNMP systems.

• Transmitter Name - Enter an identification for the transmitter/station (e.g.,

NX300_WXYZ). This name will be included in notification emails.

• Sender Email Address - Enter as a standard email address (e.g., [email protected]), This is the address that will appear in the “From:” line in any email notification received from the transmitter. It should be an email registered with the email server.

NOTE :

The sender email address’ domain (e.g., “.com”, “.ca”, “.info”, etc.) must be two

(2), three (3), four (4) or six (6) characters in length. Other character lengths are not accepted

.

• Authentication Required - If your email server requires authentication to send emails, click the check box and enter the appropriate Username and Password to allow this. If the check box is not selected, the Username and Password fields do not appear. Only TLS secured SMTP servers are supported.

• Username - Enter the username for your outgoing email server.

• Password - Enter the password or your outgoing email server.

NOTE

: The transmitter will automatically handle encryption if the associated mail server requires it.

4. When complete click

Apply

or click

Cancel

to restore the previous settings. Use the

Test

button to enter an email address to test your settings. Enter the email address destination for the test mail and click the

OK

button to send the test email or the

Cancel

button to return to the

Email Configuration

page.

5. Select a new User Settings option or press X to exit this page.

Page 2-80 Issue 6.0 2019-01-31


Notifications

The

Notifications

feature (see Figure 2.58

) provides a means for the transmitter to issue emails

or texts (SMS messages) triggered by user defined alarm events. If you use this feature, you

must also configure an email (see “Email Configuration” on page 2-80

).

Figure 2.58: Notifications

To configure the notifications feature, perform the following steps:

1. Pre-existing notifications are displayed in the Notifications list (e.g., “Audio Loss”).

Click

Add

to create a new item for notification, click

Edit

(after highlighting an existing item) to edit an existing item or click

Delete to erase an item.

2. When you click

Add or

Edit, the screen in

Figure 2.59

will appear. This screen allows you to add or edit a

Notification Name, Recipient Email, and define the alarm list by

Device type (Controller, Exciter A or B, Rack # or RF Module #). Add or remove alarms by moving them (using the >> and << arrow buttons) from the

Available

Alarms list to the

Selected Alarms list. An email is issued when any alarm in the

Selected Alarms list is active.

In the

Recipient Email field, you can enter a standard email address to initiate an email or you can enter a mobile phone number and SMS gateway to initiate a text (SMS message). The email-to-SMS text format is mobilenumber@mobile_gateway (e.g.,

Issue 6.0 2019-01-31 Page 2-81


[email protected]). Check with your mobile carrier to determine the proper gateway address for your area.

3. When complete click the

OK button to accept changes or the

Cancel button to discard changes and return to the

Notifications page.

Figure 2.59: Notifications Adding/Updating

Page 2-82 Issue 6.0 2019-01-31


Exgine Network Settings

The Exgine Settings page (see


) allows you to configure IP information for use with the Exgine option.

NOTE:

Nautel recommends that the following network settings be entered/vetted by a qualified

Network Administrator. If parameters are changed and the AUI is reset, record the new values to ensure you can log in after changes have been made.

Configure Exgine settings as follows:

1. Open the

User Settings

page by pressing

Menu > User Settings

in the

Home

page.

2. Select the Exgine Settings option (left-side of the screen) to display a list of pre-existing settings.

3. Enter the following parameters and select

Apply

.

• Protocol -

Selects the E2X protocol to use UDP or TCP. Match this setting to the exporter configuration.

• Exgine IP, Netmask and Gateway -

Configure the Exgine's IP network parameters as assigned by the local network administrator. If no gateway is used or assigned, enter 0.0.0.0

.

• Exporter IP -

Enter the exporter's IP address of the interface where the data stream is originating. It is used to filter E2X traffic in case multiple exporters are used in broadcast mode on a single LAN. 0.0.0.0 is also a valid configuration .

• E2X Port - The exgine expects E2X on port 9000. Some non-Nautel Exporters utilize port 11000 instead.

• Mac Address - Displays a number that serves as unique network adapter identifier. This is set by the manufacturer and is displayed for informational purposes only. It may be necessary to use this number to allow the AUI to access your network

Issue 6.0 2019-01-31 Page 2-83


Figure 2.60: User Settings - Exgine Settings


Page 2-84 Issue 6.0 2019-01-31


SNMP Configuration

The SNMP configuration page provides a user with a means to configure the SNMP agent and

to enable and configure associated traps (see Figure 2.61

).

Figure 2.61: User Settings - SNMP Configuration

Configure the SNMP agent as follows:

1. Enter the first five fields, noting the following:

• Agent Port : Enter the UDP port where the SNMP agent checks for requests. The default setting is 161. If your transmitter is behind a firewall, you must open this port to use SNMP.

• Read Community : Enter the password for the SNMP client application to allow acquisition of channel values. Provide confirmation of this password in the

Confirm field.

• Write Community: Enter the password for the SNMP client application to allow changing of channel values. Provide confirmation of this password in the Confirm field.

NOTE:

The passwords entered in the Read and Write Community fields must be identical with those used in your SNMP Client or MIB browser.

Issue 6.0 2019-01-31 Page 2-85


2. Click the Enable Traps check box to allow the SNMP agent to send trap notifications. and to display two additional fields associated with traps. Enter the two additional fields as follows:

• Trap Receiver IP : Enter the IP address of the computer to which the SNMP agent will send trap notifications. The computer must be running an SNMP application that is configured to receive traps. The SNMP agent will send trap notifications to at most one receiver.

• Trap Receiver Port: Enter the UDP port where the SNMP agent will send traps. The default setting is 162.

3. When complete click

Apply

or click

Cancel

to restore the previous settings.

Page 2-86 Issue 6.0 2019-01-31


Critical Parameters

This feature is available through the remote AUI only.

You can capture critical parameter data for the transmitter’s current state using the AUI’s

Critical Parameters

page (see

Figure 2.62

). To view this page, select

Critical Parameters

from the

User Settings

page. From this page, you can click

Capture Meters

(reads all meter values),

Capture Alarms

(reads all active alarms),

Capture Presets

(reads current preset) and

Capture

Settings

(reads current settings, e.g., active exciter, threshold settings, scale factors, etc.). Once you click the

Capture

button, you can click the associated

Copy

button to copy the data to your Windows clipboard. The data copies in a tab-delimited format and is ideally suited for pasting into an Excel spreadsheet. Click

X

in the upper, right corner to close this page and return to the home page.

Figure 2.62: User Settings - Critical Parameters

Issue 6.0 2019-01-31 Page 2-87


Time Setup

There is an internal clock on the transmitter that has a backup battery and maintains the accurate time and date even during power outages. The

Time Setup page contains editable fields for the date (month, day and year) and time (hours, minutes, and seconds), which is shown on the main screen of the AUI and used for stamping log entries. The clock operates in

24-hour format ( Figure 2.63

).

Set the time and date when the transmitter is first installed, and if the backup battery fails.

Figure 2.63: User Settings - Time Setup

The Time Setup option allows users to set the exact time and date information as well as regional and timezone settings for a transmitter location. All data received from the AUI server (i.e., logs) are time-stamped in UTC time. Setting the time zone information allows this timestamp to be adjusted for the user-specific time zone, and ensures the clock will adjust automatically for daylight savings time (if applicable).

Procedure to set up the time and date:

1. Select the

Time Setup

option from the left side of the

User Settings

page to open a related window on the right side of the page.

Page 2-88 Issue 6.0 2019-01-31


2. Enter the following Time and Date parameters and press

Apply

.

• Time - enter the hour (24-hour clock), minutes (up to 60), and seconds (up to 60).

• Date - select values from the drop-down menus beside Day, Month, and Year.

3. Enter the following location parameters and press

Apply

:

• Timezone - select the appropriate timezone from the drop-down menu

• Region - select the appropriate region from the drop-down menu

• Country - select the appropriate country from the drop-down menu

• Zone - select the appropriate zone from the drop-down menu

Issue 6.0 2019-01-31 Page 2-89


NTP Servers

You can configure one or more NTP (Network Time Protocol) servers to allow clock synchronization with all computers on the same network as the NX15/NX25. To view the

AUI’s

NTP Servers


), select

NTP Servers from the

User Settings options.

There are several functions available on this page - enabling NTP, monitoring NTP server status and managing servers.

NOTE:

The accuracy of the NTP synchronization is related to the distance to the server. For this reason, Nautel recommends that you choose servers in the same country as the equipment.

If this is not possible, attempt to get servers from the same continent.

NOTE:

The NTP clock synchronization polling interval varies between 64 and 1024 seconds. To minimize network traffic, the interval will change depending on how much error is accumulated between polling events and will be increased if the remote NTP server becomes unreachable. The polling interval is also randomized slightly to avoid the situation where a large number of requests are always arriving at the NTP server at the same time.

Figure 2.64: User Settings - NTP Servers

Enabling NTP

Verify that Timezone has been established under Time Setup

(see “User Settings - Time Setup” on page 2-89

) prior to enabling NTP. This is to ensure NTP time (which is always UTC) will properly offset for the region in which the transmitter is located and that the clock will adjust automatically for daylight savings time (if applicable).

Page 2-90 Issue 6.0 2019-01-31


Enable the NTP function by selecting the

Enable NTP

checkbox. Disable by de-selecting the

Enable NTP

checkbox. Click the

Apply

button to activate any change.

Monitoring NTP Servers

The

NTP Server Status

section displays tabular information on the NTP servers connected to the network. The table includes remote name, IP address, delay, offset and jitter.

•

Remote Name:

Displays the host name of the referenced time source. An asterisk

(*) in the first column marks the reference time source that is currently preferred by the NTP daemon. A ‘+” character in the first column marks high quality candidates for the reference time that could be used if the currently selected reference becomes unavailable.

•

IP

: Displays the IP address associated with the

Remote Name

. In some cases the

Remote Name

could be the IP address.

•

Delay:

Displays the round-trip delay (in ms) of the time queries.

•

Offset:

Displays the difference (in ms) between the reference time and the system clock.

•

Jitter:

Displays the magnitude of jitter (in ms) between several time queries.

Managing NTP Servers

The

Manage Servers

section displays the NTP server files that have been added. You can

Add to the list of NTP servers or

Delete

a selected NTP server from the list.

Issue 6.0 2019-01-31 Page 2-91


Nautel Phone Home

Phone Home is a system developed by Nautel that takes advantage of the vast amount of data collected by Nautel transmitters by proactively sending information to the cloud via the internet once a user enables Phone Home on their transmitter.

This data includes logs, alarms and meter readings which are then stored in a database and can be analyzed by Nautel staff if an alarm is reported by the transmitter. Since all data is pushed out to Nautel by the transmitter to the cloud, there is no need to reconfigure your firewall and potentially compromise your transmitters security. All data transfers are one way.

Nautel Transmitters are intelligent, collecting data on nearly every aspect affecting your transmitters performance. When this data is used by Nautel customer support staff for diagnostics purposes it cuts down on repair time and gets you back on air faster.

Nautel customer service technicians can use Phone Home to analyze data in real time, even accessing the live AUI, or to view the state of a customer’s transmitter at any time leading up to a fault.

This unique diagnostic approach allows Nautel support staff to take a trip back in time and review the events leading up to and during an alarm occurrence, giving customer service technicians valuable insight into how your transmitter is behaving before, during and after an alarm and how this behavior may be related to the alarm event.

Figure 2.65: Nautel Phone Home

Page 2-92 Issue 6.0 2019-01-31


Setting call sign/ID

The Call Sign/ID screen (see

Figure 2.66

) can be used to set a name that can be used to identify the transmitter on the AUI. This identification will be displayed on the top banner of the AUI page (e.g., “WABC”).

Enter the call sign or ID in the field and press

Apply

(maximum 15 characters in length). Press

Cancel

to clear the Call Sign/ID field.

Figure 2.66: User Settings - Call Sign/ID

Issue 6.0 2019-01-31 Page 2-93


System Settings page

You determine critical system configuration parameters using the

System Settings page (see

Figure 2.67

), which you access from the

Menu

page.


•

“Reboot” on page 2-96

•

“Upgrade software” on page 2-98

•

“Screen configuration” on page 2-97 (available on front panel AUI only)

•

“Exciter Clock Calibration” on page 2-99

•

“RF Monitor Level” on page 2-101

•

“Power Lockout” on page 2-102

•

“Power Thresholds” on page 2-103

Figure 2.67: System Settings Page

To use this page, select an item from the list on the left-side of the page to open related information on the right side of the page.

Page 2-94 Issue 6.0 2019-01-31


Reboot

The

Reboot


) allows you to reboot two items - the AUI and the active exciter.

Figure 2.68: System Settings - Reboot

Procedure to reboot the AUI or Exciter:

1. Select the

Reboot


System Settings


2. Reset the items by pressing the appropriate button.

• To reset the AUI (advanced user interface), press

Reboot AUI

.

• To reset the active exciter press

Reboot Active Exciter

.

After rebooting a component you may need to log in to the transmitter AUI once again (see

“Logging into the AUI” on page 2-3

).

Issue 6.0 2019-01-31 Page 2-95


Screen configuration

The

Screen Configuration


), available on the local AUI only, allows you to perform a calibration on the touchscreen and to configure a screen saver for the local AUI.

Figure 2.69: System Settings - Screen Configuration (local AUI only)

Procedure to calibrate the touchscreen:

1. Select the

Screen Configuration option on the left side of the



2. Press the

Touchscreen Calibration button. This will initiate a calibration screen, where you will be prompted to sequentially touch three targets from a position of normal use. Touch each target. After the third target, the calibration is complete and the screen display returns to the

Screen Configuration page.

Procedure to configure a screen saver:

1. Select the

Screen Configuration option on the left side of the



2. To enable a screen saver, press the

Screen Saver Enabled check box. This allows you to set the

Screen Saver Timeout

period (between 10 and 180 minutes; default is 10 minutes) by pressing in the

Minutes

field and entering, using the numeric keypad that appears, the desired timeout period.

3. Press the

Apply

button to activate the change. The screen saver is now enabled. If the timeout period lapses between local AUI screen touches, the AUI screen will switch to screen saver mode (black screen). Touch the screen to restore the last AUI page.

Page 2-96 Issue 6.0 2019-01-31


Upgrade software

The

Upgrade Software

page allows for uploading software upgrade files for various transmitter components (e.g., System Controller, AUI, etc). Navigate the page as described below. For more detailed information, see "Upgrading software", on page 4-1 of this manual.

Figure 2.70: System Settings - Upgrade Software

Select

Upgrade Software

from the left side of the


page to open a related window on the right side of the page. The page consists of the following sections and buttons:

• Current Version - indicates the current software version.

• Select Upgrade File - displays the upgrade files that are uploaded to the transmitter.

• Details - opens a window containing information about the installed software. If an upgrade file is selected, the screen will show a comparison between the installed version and the selected upgrade by component. Identical items are shown in green; different items are shown in red. You can also view the details of the previous upgrade by pressing the

View Last Upgrade

checkbox.

• History - displays a window containing a history of the upgrades to the software. Press the + button to expand the details of the software. You can save this information to disk as a txt file from the remote AUI.

• Start Upgrade - begins the process of upgrading the current software with the selected upgrade file.

• Manage Files (available through the remote AUI only) - opens a window displaying the files you can upload to upgrade the software. You can add or delete files from this list using the

Browse

,

Upload

and

Delete

buttons in the window.

Press

Done

when finished to exit the window and return to the

Upgrade Software

page.

Issue 6.0 2019-01-31 Page 2-97


Exciter Clock Calibration

The

Exciter Clock Calibration

page (see

Figure 2.71

) allows you to calibrate the internal clock

reference to an external 10 MHz clock by pressing the

Calibrate

button. Both exciters are calibrated at the same time. Note: typically, a value change is not required.

The exciter clock may also be synchronized to a reference source, either an external 10 MHz reference connected to A11A1J8 or a Nautel optional GPS sync PWB

, or a combiner, as applicable. The Combiner source option is applicable for combined systems only. The exciter reference will lock to the external source frequency within 10 mHz (0.01 Hz) using the

10 MHz sync input, to within 2 mHz (0.002 Hz) using the GPS sync card without an antenna, and to within the quality of the GPS system when using the GPS sync card with an antenna.

Figure 2.71: System Settings - Exciter Clock Calibration

If None (default) or 10MHz Sync Source is selected, no other settings are required.

If GPS Sync Card is selected, the Antenna Present drop-down field is also displayed (select Yes or No)

If Combiner is selected (for combined systems only), the Phase Offset field is also displayed.

Procedure to calibrate the exciter clock:

1. Select the



System Settings page to open a related window on the right side of the page.

2. Connect an external 10 MHz source to A11A1J8, verify a value near 10 MHz displays in both

External Clock Frequency

fields, and press

Calibrate.

Page 2-98 Issue 6.0 2019-01-31


Procedure to synchronize the exciter clock:

1. Select the



System Settings page to open a related window on the right side of the page.

2. Connect a source (10 MHz input or GPS sync).

3. Select a

Sync Source

from the drop-down list, noting the options are:

• GPS Sync Card: the exciter will operate with external Frequency and Phase sync; it will automatically revert to Frequency sync if the 1 kHz signal is not reliable, or to its internal frequency reference if the 10 MHz signal is not reliable. An additional

Antenna Present

drop-down menu will appear with this selection. If there is no

GPS antenna (select No), the GPS sync card’s receiver alarms are inhibited.

• 10 MHz Sync Input: the exciter will operate with Frequency sync, and it will automatically revert to its internal frequency reference if the external 10 MHz sync signal is not reliable.

• Combiner: for transmitters configured as part of a combined system. The exciter will operate with external Frequency and Phase sync, and it will inhibit its output if any of the necessary signals are not reliable. An additional Phase Offset field will appear with this selection. The user can enter a phase offset in 0.001 degree increments.

NOTE :

The remote AUI’s Scheduler button will not display when the Sync Source is set to Combiner. Use the associated combiner cabinet’s AUI Scheduler button to configure the system schedule.

• None: the exciter will work entirely with its internal frequency reference.

4. Select

Apply to activate the selection .

Issue 6.0 2019-01-31 Page 2-99


RF Monitor Level

The

RF Monitor Level

page allows you to set values for the

Gain at Full Power

(in dB) (see

Figure 2.72

) on the amplifier that drives the

RF Monitor

output. The RF monitor is factory set to provide a level of 5 V rms into 50 ohm (27 dBm).

The

Current Gain

value is shown for reference. Increase the gain to increase the RF monitor output level; decrease the gain to decrease the RF monitor output level. The transmitter will attempt to maintain this level at all power set points (see

Figure 2.72 on page 2-101 ).

NOTE:

You can achieve an RF monitor level of 5 V rms for power levels as low as 10% of rated power for NX25 or 17% of rated power for NX15. Below 10% (for NX 25) or below 17% (for

NX15) rated power, the maximum achievable RF monitor level may be lower than 5 V rms.

Figure 2.72: System Settings - RF Monitor Level

Procedure to set the RF monitor level:

1. Select the

RF Monitor Level




2. Observe the

Current Gain

value and its corresponding RF monitor level (measured).

Enter the new

Gain at Full Power

value to increase or decrease the RF monitor level.

3. Press

Apply

. Verify the measured RF monitor level is as desired. Readjust as necessary.

Page 2-100 Issue 6.0 2019-01-31


Power Lockout

The

Power Lockout

page (see

Figure 2.74

) allows you to set a high power limit for the

transmitter. There is provision to set up to eight different limits (which can be used to accommodate daytime/night-time patterns or different antennae), but only the selected limit is active. You can also select a high power limit using a digital remote input (see

Remote inputs on page 2-124

).

The transmitter power cannot increase beyond the active limit. For analog and hybrid modes of operation the displayed power limits represent carrier power. For DRM mode, the displayed power limits represent RMS power. If the active preset set point is greater than the active lockout limit, a

High Power Lockout

alarm will appear on the

Transmitter Status

page.

For basic transmitter operation, you must configure and enable at least one of the eight high power limits. Max Power Lockout 1 is factory set for the transmitter’s maximum output power.

Set up a power lockout as follows:

Figure 2.73: System Settings - Power Lockout

1. Select

Power Lockout




2. Select the desired

Active Power Lockout

( Max Power Lockout 1 through 8 ) from the dropdown menu

3. Enter the desired

Power Lockout

level for each of the eight lockout options, noting it will represent the maximum allowable power level.

Issue 6.0 2019-01-31 Page 2-101


4. Press

Apply

to activate the change(s) or press

Cancel

to abort.

Power Thresholds

The

Power Thresholds

page (see

Figure 2.74

) allows you to set two distinct low forward

power thresholds the transmitter. These thresholds are for monitoring purposes only. The transmitter will not shut back if these thresholds are crossed, but alarm notifications are generated for each of the two thresholds ( Low Forward Power Threshold 1 and Low Forward Power

Threshold 2 ) on the

Transmitter Status

page.

Figure 2.74: System Settings - Power Thresholds

1. Select

Power Thresholds




2. Enter the desired low power threshold level for each of the two options, noting the level represents the percentage of the normal operating setpoint. The default settings for Low Forward Power Threshold 1 and 2 are 50% and 25%, respectively.

3. Press

Apply

to activate the change(s) or press

Cancel

to abort.

Page 2-102 Issue 6.0 2019-01-31


Precorrection Settings page

You control various critical parameter functions using the

Precorrection

page (see

Figure 2.75

), which you access from the

Menu

page.

NOTE:

These settings will normally be generated at the factory, based on the desired modes of operation, and should not require user adjustment.


•

“Mag-Phase Delay” on page 2-105

•

“B+ Setpoint” on page 2-106

•

“AM-AM Correction” on page 2-107

•

“AM-PM Correction” on page 2-108

•

“Envelope Equalization” on page 2-109

•

“Configurations” on page 2-110

•

“Exciter Synchronization” on page 2-112

Figure 2.75: Precorrection Settings Page

To use this page, select an item from the list on the left-side of the page to open related information on the right side of the page.

Issue 6.0 2019-01-31 Page 2-103


Mag-Phase Delay

The

Mag-Phase Delay

page (see

Figure 2.76

) allows for setting the difference in delay between the magnitude (PDM) path and phase (RF drive) path in the exciter. Changing this delay can help to level out and minimize spectral regrowth, providing improved spectral performance and increased margin under the mask. Typically, the delay is set between 0 and 1 us. Use the spectrum analyzer instrument panel displayed in this section to verify applied changes are satisfactory.

The value is factory set and changes are not typically required unless the antenna (load) network has changed. Minor adjustments may be required to optimize IBOC or DRM spectral performance. If so, enter the Phase Delay value (between -10 us and +10 us) and press

Apply

.

Figure 2.76: Precorrection - Mag-Phase Delay marker tools to move the marker and display information

Page 2-104

Jump ahead backward one step forward one step zoom-in/ zoom-out close

Issue 6.0 2019-01-31


B+ Setpoint

The

B+ Setpoint

page (see

Figure 2.77

) allows you to identify the

B+ Setpoint

(nominally 400

V). This value does not normally require user adjustment.

Figure 2.77: Precorrection - B+ setpoint

Issue 6.0 2019-01-31 Page 2-105


AM-AM Correction

The

AM-AM Correction page (see

Figure 2.78

) allows you to load or capture a set of AM-AM correction curves. You can

Load

or

Delete

curves in this list; you can also capture a curve.

When you select

Capture

, the AM-AM Correction window is displayed. Press

Done

to capture the curve, type a name for the curve, then press

Save

(or

Cancel

).

CAUTION:

Making changes to the AM-AM Correction curves automatically places the transmitter in analog AM mode, with full-scale sine-wave modulation. To avoid undesirable output or possible antenna damage, it is highly recommended that you perform these calibrations while operating the transmitter into a test load.

Value changes are not typically required. Up to three curves can be saved in memory.

AM-AM curves correct for a type of non-linearity where a change in input amplitude does not cause a linearly proportional change in output amplitude. By applying a test signal and monitoring the output of the transmitter, the exciter will generate a table of values describing the required gain versus input signal level in an attempt to find the inverse curve to the AM-

AM non-linearity, and provide a more linear amplifier. Applying the proper AM-AM correction will result in lower audio distortion and better spectral performance in digital modes of operation.

Figure 2.78: Precorrection AM-AM

Page 2-106 Issue 6.0 2019-01-31


AM-PM Correction

The

AM-PM Correction


) allows you to load or capture a set of AM-PM correction curves. You can

Load

or

Delete

curves in this list; you can also capture a curve.

When you select

Capture

, the AM-PM Correction instrument panel is displayed. Press

Done to capture the curve, type a name for the curve, then press

Save

(or

Cancel

).

CAUTION:

Making changes to the AM-PM Correction curves automatically places the transmitter in analog AM mode, with full-scale sine-wave modulation. To avoid undesirable output or possible antenna damage, it is highly recommended that you perform these calibrations while operating the transmitter into a test load.

Value changes are not typically required.

AM-PM curves correct for a type of non-linearity where a change in input amplitude causes a change in phase. By applying a test signal and monitoring the output of the transmitter, the exciter will generate a table of values defining the required phase offset versus input signal level in an attempt to find the inverse curve to the AM-PM non-linearity, and provide a more linear amplifier. Applying the proper AM-PM correction will result in better spectral performance in digital modes of operation.

Figure 2.79: Precorrection AM-PM

Issue 6.0 2019-01-31 Page 2-107


Envelope Equalization

The

Envelope Equalization


) allows you to load or capture a set of

envelope equalization curves. You can

Load

or

Delete

curves in the list; you can also capture a curve. When you select

Capture

, the EQ Frequency Response window is displayed. Press

Done

to capture the curve, type a name for the curve, then press

Save

(or

Cancel

).

CAUTION:

Selecting the Wide Band Noise training signal (see Figure 2.80

) applies full-scale

white noise modulation. To avoid undesirable output or possible antenna damage, it is highly recommended that you perform these calibrations while operating the transmitter into a test load.

Value changes are not typically required.

Envelope equalization curves correct for the frequency response of the magnitude path, dominated by the response of the modulator filter. By applying a test signal and monitoring the output of the transmitter, the exciter will use an LMS (Least Mean Squares) algorithm to generate a filter in an attempt to find a complementary response to the frequency response of the magnitude path (out to approximately 70 kHz). Applying the proper equalization curve will result in a flatter frequency response, and improved spectral performance in digital modes of operation, where the frequency content of the magnitude signal can be significant, as far out as 100 kHz..

Figure 2.80: Precorrection Envelope Equalization

Page 2-108

Wide Band Noise

Current Input

Issue 6.0 2019-01-31


Configurations

The

Configurations page (see

Figure 2.81

) allows users to group the parameters that appear

within the Precorrection Settings menu.

Figure 2.81: Precorrection - Configurations

Edit button appears for local users in Local mode or for remote users in

Remote mode.

View button appears otherwise

(cannot edit in this case).

Once a configuration is created, it can be used in a preset. This allows the user to change the pre-correction settings based on the operating mode via the preset. Configurations are normally established at the factory, based on customer operating modes, and do not require adjustment.

Procedure to edit or create a configuration:

1. Select the

Configuration


Precorrection Settings


Issue 6.0 2019-01-31 Page 2-109


2. Any existing configurations (e.g., Default Config 1610 kHz) will appear in the list. The active configuration, if applicable, is highlighted in green. You can view or edit existing configurations by pressing

Edit

, if available. You can also create a new configuration by pressing

Add

or remove a configuration by pressing

Delete

. You must have

Administrator user account permission to edit, add or delete configurations.

3. If you press

Edit

(

View

) or

Add

, the

Configuration Details

window appears (see


). In this screen you can enter or select the appropriate parameters for your desired configuration, including Name, Mag-Phase Delay, B+

Level, AM-AM Curve, AM-PM Curve and EQ Curve. When you are finished editing or creating the configuration, press

OK

to save the configuration or press

Cancel

to return to the

Precorrection Settings

page. Your new configuration should appear in the

Configurations

list.

Procedure to add a configuration to a preset:

1. Select the

Presets

option from the

Menu

page to open the

Presets

page.

2. Press the

Load

button to select the preset that you want to edit.

3. In the

General

tab, select the

Configuration

field’s drop-down menu and select the desired configuration for that preset Press

Save

to overwrite the existing preset or

Save New

to create a new preset.

NOTE: you can edit a preset without making it active

(see

“Presets - editing operational settings” on page 2-50 ).

Page 2-110 Issue 6.0 2019-01-31


Exciter Synchronization

The

Exciter Synchronization


) displays correction curve and configuration settings stored on each exciter and allows users to synchronize the settings between exciters A and B.

When AM-AM correction, AM-PM correction and EQ curves and configurations are created, they are stored in the active exciter. It may be necessary to copy these settings to the standby exciter, or in some cases to an exciter that has been replaced.

Figure 2.82: Precorrection - Exciter Synchronization

Items in green indicate the correction curve or configuration is identical for both exciter.

Items in red indicate a difference or a correction curve or configuration that is on one exciter only.

Press

Sync A -> B

to copy settings stored on exciter A to exciter B.

Press

Sync B -> A

to copy settings stored on exciter B to exciter A.

Issue 6.0 2019-01-31 Page 2-111


Changeover page - changing exciter transfer settings

The

Changeover


), accessed from the

Menu

page, allows control of exciter auto-changeover.

Figure 2.83: Changeover Page

On this page, set the following exciter information:

•

Active Exciter

- indicates the exciter that is currently active.

•

Main Exciter

- indicates (in green) which exciter is considered to be the primary exciter. Select

A

or

B

. The default exciter is

A

if the

Standby Exciter

is set to

No

.

NOTE:

Changing the setting may change the active exciter.

•

Auto Changeover - indicates (in green) if automatic exciter changeover is enabled.

Select

Yes

if automatic changeover is desired or

No

if user selected changeover is desired.

NOTE:

you cannot change the setting if the

Standby Exciter

is set to

No.

•

Standby Exciter

- identifies whether or not a standby exciter is available. This is factory set and only requires adjustment if an exciter is removed or not functional.

Yes indicates that a standby operation is available or desired.

No

indicates that a standby operation is not available or desired.

Page 2-112 Issue 6.0 2019-01-31


Factory Settings

Values for critical parameters are set using the

Factory Settings


), which

you access from the

Menu

page. To use this page, simply select an item from the list on the leftside of the page to open related information on the right side of the page.

WARNING: Factory settings are established at the factory and should not require any adjustment. These settings affect critical system protections. Making changes to these settings may void your warranty. Contact Nautel before making changes.

For future reference, record a parameter value before and after making a change.


•

“Audio Inputs” on page 2-115

•

“B+ Calibration” on page 2-116

•

“Forward/Reflected Power” on page 2-117

•

“RF Symmetry” on page 2-118

•

“SWR Thresholds” on page 2-119

•

“Transmitter Type” on page 2-120

•

“Transmitter Frequency” on page 2-121

•

“PDM Settings” on page 2-122

Figure 2.84: Factory Settings Page

Issue 6.0 2019-01-31 Page 2-113


Audio Inputs

The

Audio Inputs


) displays the measured level of the Balanced Analog source (in dBm).

The balanced calibration field allows for establishing a reference from a known source.

WARNING: Factory settings are established at the factory and should not require any adjustment.

These settings affect critical system protections. Making changes to these settings may void your warranty. Contact Nautel before making changes.


Figure 2.85: Factory Settings - Audio Inputs

Page 2-114 Issue 6.0 2019-01-31


B+ Calibration

The

B+ Calibration page (see

Figure 2.86

) displays the measured B+ levels, the B+ Limit

Setpoint (high voltage alarm level; nominally 420 V) and a calibration box. The B+ calibration value allows you to enter a measured B+ voltage to calibrate the B+ based on an externally measured B+ level.




Figure 2.86: Factory Settings - B+ Calibration

Issue 6.0 2019-01-31 Page 2-115


Forward/Reflected Power

The

Forward/Reflected Power page (see

Figure 2.87

) allows the forward/reflected power to be calibrated based on the filter lag, the ideal PA impedance (magnitude and phase), the test load impedance and the measured RF current. Nautel sets these values at the factory. Value changes are not typically required unless you are performing a frequency change.




Figure 2.87: Factory Settings - Forward/Reflected Power

Attempting to turn off ( Disable) the SWR Protection will display the following WARNING , prompting you to confirm your selection.

Page 2-116 Issue 6.0 2019-01-31


RF Symmetry

The

RF Symmetry page (see

Figure 2.88

) allows entering RF symmetry values for exciter A or

B to attempt to minimize second harmonic content when operating on each exciter. Values are factory set and should not require adjustment.




Figure 2.88: Factory Settings - RF Symmetry

Issue 6.0 2019-01-31 Page 2-117


SWR Thresholds

The

SWR Thresholds page (see Figure 2.89

) displays the threshold values for

Peak Reflected

Limit

,

RMS Reflected Limit

,

Peak RF Current Limit

,

Peak Reflected Scale

and

Fast SWR Shutback

.

The peak reflected scale value has an associated calibration routine, which is initiated using the

Start button. Value changes and calibrations are not typically required.




Figure 2.89: Factory Settings - SWR Thresholds

Attempting to

Start

the peak

Reflected Scale Calibration

routine will display the following

WARNING , prompting you to confirm your selection.

Page 2-118 Issue 6.0 2019-01-31


Transmitter Type

The

Transmitter Type


) displays the selected transmitter type. The selection is based on the power capacity of the transmitter and is set at the factory during testing.




Figure 2.90: Factory Settings - Transmitter Type

Issue 6.0 2019-01-31 Page 2-119


Transmitter Frequency

The

Transmitter Frequency page (see

Figure 2.91

) displays the precise carrier frequency of the transmitter. Do not change the carrier frequency unless you are performing a frequency change procedure.




Figure 2.91: Factory Settings - Transmitter Frequency

Page 2-120 Issue 6.0 2019-01-31


PDM Settings

The

PDM Settings page (see

Figure 2.92

) displays the selected PDM settings. The selection is

based on the PDM configuration of the transmitter and is set at the factory during product testing.

PDM Phase Calibration may be required after replacing or moving RF power modules.

See the “Optimizing RF power module Performance” on page 1-55 of the NX15/NX25

Troubleshooting Manual for more information

.




Figure 2.92: Factory Settings - PDM Settings

Attempting to

Start

the peak

Minimization Routine

will display the following WARNING , prompting you to confirm your selection.

Issue 6.0 2019-01-31 Page 2-121


Remote I/O page

The

Remote I/O


), accessible from the

Menu

page, allows you to configure your remote input/output interface for the transmitter. Click X in the upper, right corner to close this page and return to the home page.

Refer also to the NX15/NX25 Pre-installation Manual for information on remote inputs and outputs and their factory default settings.


•

“Remote inputs” on page 2-124

•

“Remote outputs” on page 2-126

Figure 2.93: Remote I/O Page

Page 2-122 Issue 6.0 2019-01-31


Remote inputs

In the

Remote I/O

page, use the

Inputs

tab parameters (see Figure 2.94

) to configure up to 16 remote inputs that allow you to remotely control various operational characteristics of the transmitter.

Unless otherwise noted these inputs are only accepted by the transmitter if the

Remote/Local status (bottom panel of any AUI page) is set to

Remote

. That setting can only be selected by a local user using the front panel AUI.

Nautel sets remote input defaults prior to shipping. See the NX15/NX25 Pre-installation

Manual for details. If necessary, re-configure the remote inputs as follows:

Figure 2.94: Remote I/O Input Parameters

Input tab Exit page

Current logic level

1. On the left side of the page, select the desired remote input (1 through 16) from the list.

Note: you can configure remote inputs 1 through 16 for one of a variety of control inputs.

2. On the right side of the page, assign a name to the digital input by pressing the

Channel

bar and selecting one of the following options:

•

Not Assigned

- has no effect on transmitter operation, regardless of logic level.

•

RF On/Off

- tells the system to provide RF power, if possible (same as pressing the

RF

On

or the

Rf Off button on the AUI).

•

Reset

- causes a system reset.

Issue 6.0 2019-01-31 Page 2-123


•

Inc/Dec RF Power

- tells the system to increase (if possible) or decrease output carrier power.

•

Main Exciter

- selects the main exciter to operate the transmitter.

•

Auto Changeover

- enables (on)/disables (off) the automatic exciter changeover function.

•

Scheduler On/Off

- enables (on)/disables (off) the automatic mode scheduler.

•

Max Power Lockout 1 - 8

- selects the associated power lockout limit (1 - 8) as active

(functions regardless of local/remote mode).

NOTE

: If multiple inputs are activated simultaneously, the lockout of least power will be activated.

•

Preset:

(name) - selects the appropriate operating preset as active.

3. The

Level

bar displays the input’s current logic level (1 or 0).

4. Configure the active/inactive control for each of the 16 remote inputs. Press the arrow beside the

Control

bar to display the following drop-down menu options:

•

Rising Edge, Turn On/Reset/Set To A/Set To B

. Logic ‘1’ (high or rising edge) activates the input (or causes a reset, as appropriate).

•

Falling Edge, Turn On/Reset/Set To A/Set To B

. Logic ‘0’ (low or trailing edge) activates the input (or causes a reset, as appropriate).

•

Rising Edge, Turn Off

. Logic ‘1’ (high or rising edge) de-activates the input.

•

Falling Edge, Turn Off

. Logic ‘0’ (low or trailing edge) de-activates the input.

•

Falling Edge, Toggle

. Logic ‘0’ (low or trailing edge) de-activates the input; next logic ‘0’

(low or trailing edge) activates the input.

•

Rising Edge, Toggle

. Logic ‘1’ (high or rising edge) activates the input; next logic ‘1’

(high or rising edge) de-activates the input.

•

Rising Edge, Turn On/Set To B. Falling Edge Turn Off/Set To A

. Logic ‘1’ (high or rising edge) activates the input; logic ‘0’ (low or trailing edge) de-activates the input.

•

Falling Edge, Turn On/Set To B. Rising Edge Turn Off/Set to A

. Logic ‘0’ (low or trailing edge) activates the input; logic ‘1’ (high or rising edge) de-activates the input.

•

Active High, Increase

. Logic ‘1’ (high) causes a power increase or turns on the feature.

•

Active Low, Increase

. Logic ‘0’ (low) causes a power increase.

•

Active High, Decrease

. Logic ‘1’ (high) causes a power decrease.

•

Active Low, Decrease

. Logic ‘0’ (low) causes a power decrease.

•

Active High, Turn On

. Logic ‘1’ (high) activates the input.

•

Active Low, Turn On

. Logic ‘0’ (low) activates the input.

5. When the input settings are complete, press

Apply

to accept and activate these changes or press

Cancel

to cancel them and return to the previous settings.

6. To exit the page, press

X

(top right).

Page 2-124 Issue 6.0 2019-01-31


Remote outputs

Using the parameters from the

Outputs

tab (see Figure 2.95

), you can configure up to 16 remote outputs that indicate either the presence of various alarms or the status of operator controlled circuits.

Nautel sets remote output defaults prior to shipping. See the NX15/NX25 Pre-installation

Manual for details. If necessary, re-configure the remote outputs as follows:

Figure 2.95: Remote I/O - Output Parameters

Outputs tab Exit page

Current logic level

1. On the left side of the page, select the desired remote output (1 through 16) from the list. Note: you can configure remote outputs 1 through 16 for one of a variety of monitoring outputs.

2. On the right side of the page, assign a name to the remote output by pressing

Channel and selecting one of the following options:

•

Not Assigned

- No alarm or status parameter is monitored.

•

Remote Enabled

- Active logic level indicates the transmitter’s remote control is enabled. Inactive logic level indicates the transmitter is in local control only.

•

RF On/Off

- Active logic level indicates the transmitter’s RF power stage is on

(enabled). Inactive logic level indicates the transmitter’s RF power stage is off.

•

Active Exciter

- Active logic level indicates that exciter A is active. Inactive logic level indicates that exciter B is active.

•

Auto Changeover

- Active logic level indicates that the automatic exciter changeover function is enabled.

Issue 6.0 2019-01-31 Page 2-125


•

Main Exciter

- Active logic level indicates that exciter A is selected as the main exciter.

Inactive logic level indicates that exciter B is selected as the main exciter.

•

Scheduler On/Off

- Active logic level indicates that the automatic mode scheduler is enabled or disabled.

•

Various Alarms

- Active logic level indicates that the selected alarm is occurring. Any transmitter alarm can be selected as a digital output. Refer to the NX15/NX25 Troubleshooting Manual for a description of each alarm.

•

AUI Watchdog

- Active logic level indicates that a watchdog reset is occurring, due to an error in communication between the Controller and the single-board computer.

The reset is configured using the AUI’s

User Settings

page.

* Reset Immediately : Reset will occur immediately after a communications error.

* Disable Reset : No reset will occur.

* Custom Delay (default setting) : Reset will occur after a communications error, but after a user-defined delay. If selected enter the delay, in minutes (factory set to 2 minutes).

•

Max Power Lockout 1 - 8

- Active logic level indicates that a power lockout has been enabled, either through the AUI’s


page or by a remote digital input.

•

Preset: (name)

- Active logic level indicates that the associated preset is active.

•

Invalid Preset

- Active logic level indicates the current active preset is not a saved preset.

•

Remote Input

- Mimics the logic of the associated remote input selection. Example: If

Remote Output 5 is set to Remote Input, it will mimic the logic received on remote input pin 5. This is typically used for debugging remote inputs

.

3. The

Level

bar displays the input’s current logic level (1 or 0).

4. Configure the active/inactive control for each of the 16 remote outputs. Press the arrow beside the

Control

bar to display the drop-down menu options that are appropriate for the selected Channel.

Example: if the selected channel is

RF On/Off

, the drop-down options are:

•

Output Low When RF Off

- Logic ‘0’ (low) indicates the output is true (RF is off);

Logic ‘1’ (high) indicates the output is false (RF is on).

•

Output Low When RF On

- Logic ‘0’ (low) indicates the output is true (RF is on); Logic

‘1’ (high) indicates the output is false (RF is off).

5. Press the

Level

bar and select 1 or 0 as the logic level.

6. When the output settings are complete, press

Apply

to accept and activate these changes or press

Cancel

to cancel them and return to the previous settings.

7. To exit the page, press

X

(top right).

Page 2-126 Issue 6.0 2019-01-31


Audio Player

The built-in audio player (see Figure 2.96

) can use a file playlist, Livewire or Icecast as an audio

source. These sources must be configured before they can be used. This section describes how to configure audio player sources. To view the

Audio Player page, select

Audio Player from the

Menu

page options.

Using the audio player in the NX15/NX25 requires the installation of the optional USB sound card. This converts the streamed audio to a USB port on the single-board computer (SBC) to an

AES stream that can be connected to an AES input on the control card.

The

Audio Player

page has two selectable tabs:

•

“Playlist” on page 2-129

•

“Streams” on page 2-131

Figure 2.96: Audio Player page - Playlist tab shown

Issue 6.0 2019-01-31 Page 2-127


The playlist (or Icecast/Livewire stream) is typically used as an audio loss backup. For example, the user may operate with Preset 1 using one of the standard audio sources. Preset 1 can be configured to switch to another preset (e.g., Preset 2), which uses a playlist or stream, if

Preset 1 loses its audio.

Playlist/stream presets can also be activated by the Scheduler (see

“Preset Scheduler” on page 2-

65

).

Playlist

The

Playlist

tab (see

Figure 2.97

) displays the audio files and sequence that currently make up the playlist. Only audio files that are supported (e.g., .wav or .mp3 files) will be played. For

.mp3 files, using files with bit rates equal to or greater than 96 kbps achieves best audio results.

Also, you must have the optional USB sound card installed and activate a preset that has

Audio

Player/AES1 or AES2 selected in the

Analog Settings

->

AM Source

in the

Presets

page. There are three sections in the Playlist tab - Playlists, Playlist Contents and Available Files on USB.

NOTE:

You should not change an active (playing) playlist nor should you attempt to delete or move a song that is currently playing. To make changes to the playlist, the audio player must be off (inactive), or at least not being used as the active preset’s source.

The

Playlists section

is used for adding (

Add

button) and deleting (

Delete

button) playlists.

The

Playlist Contents section is used for inserting jumps (

Insert JMP

button) and deleting playlist contents (

Delete

button). The

Insert JMP

button allows the user to set up a playlist that can jump to an item in another playlist. You can drag files up and down the

Playlist

Contents

list and you can drag files from the

Available Files on USB

list to the

Playlist Contents list.

The

Available Files on USB section

is used for adding audio files to the playlist (

Add Files button) or refreshing the available files list (

Refresh

button). Audio files must be stored on an external USB device; they are not stored in the transmitter. Only the audio files stored in the root directory of the most recently connected USB device appear on the playlist. The list will be empty if no USB device is connected. The USB drive must be formatted with a FAT32 file system. Click the

Refresh

button to force an update of the list of files on the mounted USB.

NOTE

: MPEG Layer-3 audio coding technology licensed from Fraunhofer IIS and Thomson.

The audio player supports only one USB device at a time. If multiple USB devices are connected, only the most recently connected USB is recognized as the active USB drive. If multiple USB devices are connected and one is removed, both devices are unmounted.

Page 2-128 Issue 6.0 2019-01-31


The

Manage Files button, available on the remote AUI only, displays a pop-up window that allows the user to

Browse

for files and

Upload

them to the USB or

Delete

them from the USB.

You should not delete files that are part of more than one playlist.

Figure 2.97: Managing Playlist files

Issue 6.0 2019-01-31

Remote mode only

Page 2-129


Streams

The NX15/NX25 is capable of playing audio streams in either Icecast or Shoutcast format.

The audio player supports Icecast/Shoutcast playlists and IP addresses for audio streams. For an Icecast/Shoutcast playlist enter the URL for the station. For an audio stream, enter the

URL for that stream.

Figure 2.98: Audio Player page - Streams tab

Adding an Audio Stream

1. From the

Streams

tab (see

Figure 2.98

), click the

Add

button.

2. Use the drop-down menu to select the desired

Type

of audio stream (only

Icecast/

Shoutcast

is available.

3. Enter the appropriate information for the audio server (Name and URL). Make sure the NX15/NX25 can access the location.

4. Click

OK

to add the audio stream or click

Cancel

to discard changes.

Page 2-130 Issue 6.0 2019-01-31


Editing or Deleting an Audio Stream

1. From the

Streams

tab (see

Figure 2.98 on page 2-131 ), select the desired audio stream

from the list. Click the

Edit

button to modify the audio stream or the

Delete

button to remove the audio stream.

2. If you are editing an audio stream, enter the appropriate information for the audio server (Name and URL for Icecast/Shoutcast). Make sure the NX15/NX25 can access the location.

3. Click

OK

to either edit or delete the audio stream, or click

Cancel

to discard changes.

Using the ac disconnect switch

A key controlled ac disconnect switch box (see

Figure 2.99 on page 2-133 ) is provided with the

NX15/NX25 transmitter to ensure operator safety. The transmitter’s rear door must be closed and locked before ac power to the transmitter can be turned on. Similarly, ac power must be turned off before the rear door can be opened.

Opening the transmitter’s rear door

Follow these steps to gain access to the rear of the transmitter:

1. Move the ac switch to the

OFF

position. This allows the

SERVICE KEY

to be moved.

Turn the

SERVICE KEY

clockwise to the

OFF

position and remove the key from the ac disconnect switch box. When the

SERVICE KEY

is removed, the ac disconnect switch is locked in the

OFF

position.

2. Insert the

SERVICE KEY

into the key hole in the handle of the transmitter’s rear door and turn the key clockwise.

3. Open the rear door of the transmitter.

Applying ac power to the transmitter

Follow these steps to close the transmitter and apply ac power:

1. Close and latch the transmitter’s rear door. Turn the

SERVICE KEY

counter clockwise to lock the door. Remove the

SERVICE KEY

.

Issue 6.0 2019-01-31 Page 2-131


2. Insert the

SERVICE KEY

into the ac disconnect switch box’s key hole and turn the key counter clockwise to the

ON

position. Move the ac switch to the

ON

position to apply ac power to the transmitter.

Figure 2.99: Ac Disconnect Switch Operation

Key Panel Instructions

Service Key

(Shown in OFF position)

Safety Interlock Switch

(Shown in the ON position)

Box style may vary depending on ac input voltage. 200 A switch box shown.

Page 2-132 Issue 6.0 2019-01-31


Using the Keyed Controlled Access System (optional)

The NX15/NX25 high power transmitter can be equipped with a optional key controlled

interlock system ( Figure 2.100 on page 2-137 ) to ensure operator safety.

The transmitter’s rear doors must be closed and locked before ac power to the transmitter can be turned on. Similarly, ac power must be turned off before any of the access panels can be opened.

WARNING: DO NOT defeat (bypass) the keyed interlock system. Defeating the keyed interlock system will allow access to areas of the transmitter where dangerous voltages are present, and contact with exposed conductors carrying these dangerous voltages could cause serious injury or death.

This heading includes the following topics:

•

“Components of the key-controlled access system” on page 2-134

•

“Opening access panels” on page 2-135

•

“Applying Ac power to the transmitter” on page 2-135

•

“Guidelines (1): Ac power entrance panel” on page 2-136

•

“Guidelines (2): Antenna ground switch” on page 2-136

•

“Guidelines (3): Transfer case” on page 2-136

Components of the key-controlled access system

There are four (4) components in this key-controlled access system:

1. Ac Power Entrance (or Ac Disconnect Switch): requires the

SERVICE ENTRANCE KEY

to be turned on, after which the key cannot be released.

2. Antenna Ground Switch: requires the


to ground antenna.

Cannot be opened without a

TRANSFER CASE KEY

.

3. Transfer Case: requires the

TRANSFER CASE KEY

to release access lock keys. Will not release

TRANSFER CASE KEY

until all access lock keys are in the transfer case.

Issue 6.0 2019-01-31 Page 2-133


4. Access Lock Keys (quantity 2): required to open access panels throughout the transmitter system. Access panels must be closed and locked to release access lock keys.

Opening access panels

Procedure to gain access to the inside of the transmitter:

1. Turn off the ac disconnect switch or the ac breaker at the ac power-entrance panel (see

“Guidelines (1): Ac power entrance panel” on page 2-136 ). Turn

SERVICE ENTRANCE

KEY

(‘A’ key) counter clockwise and remove the key.

2. Insert the


(‘A’ key) into the antenna ground switch (see


) lock labelled

SERVICE

ENTRANCE KEY

and turn the key clockwise.

3. Close the

ANTENNA GROUND SWITCH

(see

“Guidelines (2): Antenna ground switch” on page 2-136 ) by pulling it down towards the top of the transmitter. Turn the

TRANSFER CASE KEY

(‘B’ key) counter clockwise and remove the key.

4. Insert the

TRANSFER CASE KEY

(‘B’ key) into the transfer case (see

“Guidelines (3):

Transfer case” on page 2-136 ), and turn it clockwise. The two access lock keys (‘C’

keys) will be released.

5. Remove an access lock key (‘C’ key) from the transfer case, and insert it into the appropriate access lock on the rear door or the filter panel behind the front door. Turn the key clockwise to unlock the access panel or rear door.

Applying Ac power to the transmitter

Procedure to close the transmitter and apply ac power:

1. Close all filter panels and rear doors. To release the access lock key (‘C’ key) in each panel or door, turn it counter clockwise and remove it from the lock.

2. Insert both access lock keys (‘C’ keys) into the transfer case (see “Guidelines (3):

Transfer case” on page 2-136 ),. Turn the

TRANSFER CASE KEY

(‘B’ key) counterclockwise and remove it from the transfer case.

3. Insert the

TRANSFER CASE KEY

(‘B’ key) into the


(see


) lock labelled

TRANSFER CASE

KEY

and turn the key clockwise. Open the


(2) by pushing it up away from the top of the transmitter.

Page 2-134 Issue 6.0 2019-01-31


4. Turn the


(‘A’ key) counterclockwise and remove it from


(see “Guidelines (2): Antenna ground switch” on page 2-

136

) lock.

5. Insert the


(‘A’ key) into the ac power entrance (see

“Guidelines (1): Ac power entrance panel” on page 2-136 ) and turn the key clockwise.

Move the ac disconnect switch or the ac power entrance’s breaker to the

ON

position.

Guidelines (1): Ac power entrance panel

Operation rules:

• With ac power entrance breaker in the “closed” (ON) position, the “A” key is sealed in the lock.

• When the breaker is moved to the “open” (OFF) position, the “A” key can be removed.

• When the “A” key is removed, the breaker is locked in the “open” (OFF) position.

Guidelines (2): Antenna ground switch

Operation rules:

• At the antenna ground switch, the “B” key is sealed in the lock and the switch is locked in the “open” (OFF) position.

• The action of inserting the “A” key into the antenna ground switch allows the switch to be moved to the “closed” (ON) position, grounding the RF feed to the antenna.

• With the switch “closed” (ON), the “B” key can be removed. When the “B” key is removed, the antenna ground switch is locked in the “closed” (ON) position and the

“A” key is sealed in the lock.

Guidelines (3): Transfer case

Operation rules:

• The “B” key is used to release the access-lock keys (“C” keys) from the transfer case.

• When a “C” key is removed the “B” key is sealed in the lock.

Issue 6.0 2019-01-31 Page 2-135


Figure 2.100: Keyed Controlled Access Sequence Diagram


ACCESS LOCK

KEY (rear door)

(quantity 1)

“C” IN

ANTENNA

GROUND

SWITCH

“A” IN

“B” OUT

Ac DISCONNECT

SWITCH

TRANSFER

CASE

“B” IN

2 “C’s” OUT

ACCESS LOCK

KEY (filter panel)

(quantity 1)

“C” IN

Page 2-136 Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual Routine maintenance

Section 3: Routine maintenance

This section provides instructions for performing routine maintenance on the NX15/NX25 transmitter. This section includes the following topics:

•


•

Replacing the air filter - see page 3-2

•

Performing on-air checks - see page 3-5

•

Replacing the Control/Interface PWB battery - see page 3-6

•

Inspecting lightning protection systems - see page 3-7


Scheduled maintenance consists of performing a visual inspection of the NX15/NX25 at scheduled intervals. The recommended minimum time between scheduled maintenance visits is three months. Local operating and environmental conditions may dictate more frequent visits, while in remote sites less frequent visits may be acceptable. Experience and system reliability will determine the most practical schedule for a specific installation.

Note:

A site located in a dirty area using open-air cooling requires more extensive cleaning than a site located in a clean area using closed-air cooling.

Cleaning

At a minimum, follow the cleaning procedures listed below.

1. Clean the air filter (if present), noting there is one in the rear door (see


). Remove the air filter by sliding it up and out of the retaining brackets, rinse it with water, spray both sides of the air filter with Handi-Koter filter coat (Nautel

Part # HQ59, located in the ancillary kit), then re-install the air filter. If the air filter becomes damaged, replace it as soon as possible. See

“Replacing the air filter” on page 3-2

.

CAUTION:

You must remove air filters before using the filter coat adhesive spray. The spray will contaminate the inside of the transmitter, cause accelerated dust/dirt buildup and compromise critical spacings for voltage breakdown.

Issue 6.0 2019-01-31 Page 3-1


2. Clean the NX15/NX25 using a vacuum cleaner and a soft-bristle brush to remove loose dirt. Clean, damp rags should be used to remove dirt that cannot be removed with a vacuum cleaner. Never use compressed air to clean the NX15/NX25.

Checking hardware

All hardware must be checked at least once a year. Thermal cycling from turning the NX15/

NX25 on and off will require more frequent checks.

• To prevent damaging the hardware, ensure that the proper sized tools are used. In most cases, hardware is metric.

• A mounting surface or terminal that has changed colour indicates a loose hardware connection.

• Multi-stranded cables installed on terminal strips must be retorqued (See Section 3,

“Wiring/connector lists” on page 3-1 in the Troubleshooting Manual for torque requirements).

Battery replacement

The NX15/NX25's Control/Interface PWB contains a battery backup circuit that provides a memory of alarm occurrences during ac power failure. See

“Replacing the Control/Interface

PWB battery” on page 3-6

.

Replacing the air filter

If the air filter becomes damaged or too dirty to clean, replace it as follows:

Interval

As required.

Parts and tools

Replacement air filter and filter coat spray.

Page 3-2 Issue 6.0 2019-01-31


Procedure

Take the following steps to replace an NX15/NX25 air filter:

1. Order a new filter, as necessary. You can order a standard sized filter from Nautel

(Nautel Part # HR111) or from the manufacturer (Research Products, EZ Kleen filter #

9151) or obtain one from any local supplier of HVAC supplies.

2. Order new filter coat spray, if necessary. You can order replacement filter coat from

Nautel (Nautel Part # HQ59) or from the manufacturer (Research Products Handi-

Koter adhesive spray bottle # 412) or obtain it from any local supplier of HVAC supplies.

3. Unpack the new filter and inspect it for damage.

4. Remove the old filter by sliding it up and out of the retaining brackets. See


.

5. Apply filter coat spray to both sides of the replacement filter.

CAUTION:

You must remove air filters before using the filter coat adhesive spray. The spray will contaminate the inside of the transmitter, cause accelerated dust/dirt buildup and compromise critical spacings for voltage breakdown.

6. Insert the new air filter into the brackets.

7. Dispose of the damaged air filter.

Issue 6.0 2019-01-31 Page 3-3


Figure 3.1: Replacing the Air Filter

Routine maintenance

Partial Rear View

NOTE:

Air flow direction is back to front

Page 3-4 Issue 6.0 2019-01-31


Performing on-air checks

You should check the on-air quality of the transmitter’s signal periodically. This check can be done locally at the transmitter site, or remotely from another location in the transmitter’s coverage area.

Interval

Every 12 months, or as required by law.

Parts and tools

• High-quality receiver compatible with the modulation scheme used on the transmitter.

Procedure

1. Monitor the transmitter signal to identify any problems:

• Use a high quality receiver to monitor audio quality.

• Check the spectral output of the transmitter using the AUI’s spectrum analyzer.

• Take a portable receiver to different locations in your coverage areas to identify any problems with the antenna pattern or areas of localized interference.

Issue 6.0 2019-01-31 Page 3-5


Replacing the Control/Interface PWB battery

Replace the battery on the Control/Interface PWB once a year, or whenever the

Controller -

Low Battery alarm appears (on the AUI or via digital output). Chemical leakage from an old battery can cause damage. Also, the Control/Interface PWB’s microcontroller may not retain its settings if ac power is turned off while the backup battery power is low. The battery should be replaced while ac power is applied to the transmitter.

Interval

Every 12 months.

Parts and tools

Replacement battery. 3 V lithium coin cell, 20 mm (Nautel recommends Panasonic Part #

CR2032).

Procedure

Perform the following steps to replace the battery:

1. Ensure ac power is being applied to the transmitter.

2. Open the front door of the control cabinet (A1).

3. Replace the battery in XBT1 on the control/interface PWB, noting the control/ interface PWB is located on the control/exciter panel (A1A11) behind the front door.

See Figures MD-5 and MD-6 in the Mechanical Drawings section at the end of the

Troubleshooting manual .

4. Close the front door.

5. Check for any alarms on the AUI. (See “Status - viewing transmitter status” on page 2-

70 .)

Page 3-6 Issue 6.0 2019-01-31


Inspecting lightning protection systems

You should inspect the lightning protection systems that are connected to your NX15/NX25 transmitter, ac power, RF feedline, antenna and tower periodically to ensure that your site, equipment and personnel are fully protected.

Interval

Every 6 months.

Parts and tools

Depends on your site, but may include a DVM, ladder, binoculars, and continuity tester.

Procedure

Perform the following steps to test the lightning protection systems:

1. Test the continuity between ground available at your lightning arrestor and ground available on various pieces of equipment connected to the transmitter. Ensure that there is no resistance (0 ohms).

2. Physically inspect the lightning arrestor to ensure that all connections are tight. Also look for any sign of scoring or burning (indications of possible damage from earlier lightning strikes).

3. Using binoculars, visually inspect the hardware on the tower. Look for charred, broken or frayed connections and corrosion.

Issue 6.0 2019-01-31 Page 3-7


Page 3-8 Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual Non-standard maintenance

Section 4: Non-standard maintenance

This section provides instructions for performing non-standard maintenance on the NX15/

NX25 transmitter. This section includes the following topics:

•

Upgrading software

•

Updating or Replacing Compact Flash Card - see page 4-4

Upgrading software

Periodically, enhancements or improvements to the operating system are identified and made available. Perform a software upgrade as follows:

Interval

As required.

Parts and tools

• Laptop (i.e., local computer for direct connection) or network computer with Windows and Internet Explorer Web browser

• CAT5 Ethernet cable

• Upgrade software (

*.tgz

file), provided via email, web download or flash card

Preliminary Checks

1. Determine the current software revision installed. Via the advanced user interface

(AUI) screen, go to

Menu

/

System Settings

/

Upgrade Software

. Select the *.tgz file in the Select Upgrade File list (should highlight in blue) and click

Details

. Note the current software revision for Audio Player, AUI, Controller, Exciter, Rack and PM.

2. Using a web browser go to ftp://www3.nautel.com/NX_Series/ and verify your software version is the latest. If necessary, download the latest *.tgz file to a laptop or network location.

Issue 6.0 2019-01-31 Page 4-1


Transferring Upgrade File

The following steps assume either the laptop will be used to connect directly to the transmitter

OR the transmitter and network computer are currently connected to the same network.

Transmitter IP Configuration

1. From the transmitter AUI, go to

Menu -> User Settings -> Network Setup

.

2. Record your current network settings (IP Address, Subnet Mask, Default Gateway).

3. If connecting to the transmitter directly with a laptop, you must set a static IP address.

This can only be done via the AUI. In the

Network Setup

page, set as follows:

– Press the Static IP radio button to disable DHCP

– IP Address: 10.10.10.2

– Netmask: 255.255.255.0

4. Set the transmitter to remote enabled.

Laptop IP Setup (to connect directly to transmitter)

The following steps assume the operating system is Windows XP. Adapt as required for computers with different operating systems.

1. On the laptop go to

Start Menu

/

Control Panel

/

Network Connections

/

Local Area

Network

.

2. In the Local Area Network Status, open the

General

tab and choose

Properties

. Scroll down and highlight

Internet Protocol (TCP/IP)

. Choose

Properties

.

3. In the Internet Protocol (TCP/IP) Properties window, select

Use the following IP address

.

4. Enter the following settings:

– IP Address: 10.10.10.1

– Subnet Mask: 255.255.255.0

– Default Gateway: 192.168.1.2

5. In the Internet Protocol (TCP/IP) Properties window, select

OK

.

Page 4-2 Issue 6.0 2019-01-31


6. In the Local Area Connection Properties window, select

OK

.

7. In the Local Area Connection Status window, select

Close

.

8. Close the Network Connections window.

Transfer Software Upgrade File to Transmitter

1. If using a laptop, connect the laptop network interface card to J1 of the SBC’s motherboard (A1U1) on the back of the control cabinet’s front door using a CAT5

Ethernet cable. Open Internet Explorer and search for 10.10.10.2. The transmitter login screen should appear.

2. If using a network computer, open Internet Explorer and search for the IP address recorded in Step 2 of

“Transmitter IP Configuration” on page 4-2 . The transmitter

login screen should appear.

3. At the transmitter login screen enter:

– User: “Nautel” or “****”, where **** is the user assigned user name

– Password: leave blank (default) or “****”, where **** is the user assigned password

4. Navigate through the AUI to

Menu -> System Settings -> Upgrade Software

, select the

Manage Files

button and press

Browse

. Locate the software update upload file list. Allow this operation to complete.

*.tgz

file stored on the laptop or network computer, and press

Upload

to load the file into the transmitter

Installing New Software

1. Set the transmitter to

RF Off

and for

Remote

control. If the transmitter is already in

Remote

control mode, turn off the transmitter using the AUI on the laptop. Perform the following steps remotely using the AUI on the laptop.

2. Go to the AUI

Menu -> System Settings -> Upgrade Software

screen and select the update

*.tgz file from the Select Upgrade File list (should highlight in blue) and press

Start Upgrade

.

CAUTION! Do not leave this page until the flash process is complete.

3. After a successful load (status is 100% complete and a message indicates a successful load), cycle the ac power (turn off, then on) on the NX15/NX25.

Issue 6.0 2019-01-31 Page 4-3


4. This completes the software upgrade. Restore the former network settings on the transmitter and laptop as required (see Step 2 of

“Transmitter IP Configuration” on page 4-2

).

NOTE! Make sure to clear the cache of every web browser used to remotely connect to the transmitter's AUI to ensure that the remote

AUI displays correctly after the software upgrade.

5. Login and repeat Step 1 of “Preliminary Checks” on page 4-1

to determine if the current version is the same as the upgrade version - this confirms the upgrade was successful.

6. If the upgrade was not successful, repeat Step 1 through Step 5 . If still unsuccessful, contact Nautel.

Updating or Replacing Compact Flash Card

A significant update to software functionality (i.e., upgrading from NX SW 2.8 to 4.7), or corruption of the existing file system, will require installation of a new image file prior to installing the new *.tgz file. A replacement compact flash card with pre-loaded software can be purchased from Nautel (part # 207-8707) or you can burn the IMAGE file on the existing compact flash card. Using a web browser go to ftp://www3.nautel.com/NX_Series/ and choose the most recent software release. Download the CF IMAGE file (*CF-img.zip) and information sheet on Burning Compact Flash Cards (IS13004*).

NOTE! Various settings (i.e.; User Accounts, Network Setup, Email

Configuration, Notifications, NTP Servers) and logged data will not be saved in the transmitter when you replace the compact flash card. If possible, record the information from the old compact flash as outlined in the above mentioned information sheet, so that settings can be reentered once the compact flash card has been replaced, and logged data is not lost if required.

It is also important to note that if a compact flash card has been replaced and the AUI fails to load, you may be required to change the BIOS boot option setting for the initial startup of the transmitter. Refer to IS18005* located in the same directory as the previously mentioned procedure ( ftp://www3.nautel.com/NX_Series/).

Page 4-4 Issue 6.0 2019-01-31


Touchscreen Calibration

A touchscreen calibration is required if a new image file has been burned onto the compact flash card, the card has been replaced, the touchscreen has been replaced, or the pointer is not aligning with touch inputs. To perform a touchscreen calibration, perform the following steps:

NOTE! The Screen Configuration menu is only visible in Local mode.

1. Connect a USB mouse into the single board computer (SBC) on the back of the control cabinet’s front door

2. Using the mouse, select

Menu

to display the

Main Menu

options. Select

System

Settings,

then

Screen Configuration

.

3. From the

Screen Configuration

page (see Figure 4.1 on page 4-5 ), click the

Touchscreen

Calibration

button.

4. Follow the on-screen prompts to calibrate the touchscreen by pressing on the X’s where instructed to do so.

Figure 4.1: AUI Touchscreen Calibration Menu

Issue 6.0 2019-01-31 Page 4-5


Changing the OS Password

The OS (operating system) password is a unique, factory set password that is recorded in the

Proof of Performance documents provided with the transmitter. It should not be necessary to change this password unless a new image file has been burned on the compact flash card (see

“Updating or Replacing Compact Flash Card” on page 4-4 ) or there has been a network

security breech and access to the transmitter is compromised.

To change the OS password, you will need to connect to the single board computer using SSH.

A common utility for Windows users to remotely connect is PuTTY, while Linux users can use ‘ssh’ from the command line. PuTTY is available at ftp://www3.nautel.com/Utilities/ puTTy/putty.exe

; if unable to open this link, use a search engine to find new URL.

Note: If the transmitter does not have Internet access, you can connect a laptop to J1 of the

SBC (A1U1) on the back of the control cabinet’s front door using a CAT5 Ethernet cable.

Follow the instructions for

“Transmitter IP Configuration” on page 4-2

and

“Laptop IP Setup

(to connect directly to transmitter)” on page 4-2

. Restore the former network settings on the transmitter and laptop as required after OS password has been changed.

Change the OS password as follows:

1. Connect to the transmitter IP address using your selected SSH client using Port 22.

2. Login with username root and the OS password recorded in your proof of

Performance documents.

3. At the prompt, type the command passwd . This is the Linux command to change your password.

4. Enter and confirm your new password.

5. Record your new password on the Proof of Performance document provided with the transmitter. If you would like Nautel to track your password for support purposes, please email [email protected] with your new information.

6. Close the console window.

NOTE! If a replacement CF (compact flash) card is purchased through

Nautel, the OS password will be programed with what we have on file for your transmitter. If no password is on file, a new unique password will be programmed and sent along with the CF card.

Page 4-6 Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual List of terms

Section 5: List of terms

This section defines some of the terms that are used in Nautel documentation.

ADC.

Analog to Digital Converter.

AES-EBU.

Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name of a digital audio transfer standard. The AES/EBU digital interface is usually implemented using 3-pin XLR connectors (the same type connector used in professional microphones). One cable carries both left and right-channel audio data to the receiving device.

B+.

The high voltage dc generated by the transmitter’s ac power supply for use within the transmitter. The B+ voltage is used to supply the transmitter’s modulators and other transmitter circuitry.

Cutback.

A reduction in RF output power, caused by a total power limit fault or the occurrence of three shutbacks within a five second period.

DAC.

Digital to Analog Converter.

DAM.

Dynamic Amplitude Modulation.

DCC.

Dynamic Carrier Control.

DRM.

Digital Radio Mondiale. A set of digital audio broadcasting technologies designed to work existing AM radio channels.

DSP.

Digital Signal Processing.

FPGA.

Field Programmable Gate Array.

HD Radio.

HD Radio is another term for In Band On Channel (IBOC) technology. HD Radio is a trademark of iBiquity Digital Corporation.

IBOC.

Nautel In-Band-On-Channel technology provides high quality digital audio over existing

AM radio channels.

IPM.

Incidental Phase Modulation

Latching alarm.

An alarm that, while active, keeps the transmitter in an ‘RF inhibited’ state.

This type of alarm (e.g., High SWR Shutdown) require a reset - locally or remotely - to attempt to restore transmitter operation.

Issue 6.0 2019-01-31 Page 5-1

NX15/NX25 Operations and Maintenance Manual List of terms

NE IBOC.

Nautel’s In-Band-On-Channel signal generator. See IBOC. Required for NX series

IBOC installations.

PDM.

Pulse Duration Modulation.

Preset.

A setting that controls power level, active exciter, and power scheduler status on a time-of-day and date basis. Exciters can be configured on a preset for a specific operating mode

(for example, Exciter A - conventional AM, and Exciter B - IBOC). The NX15/NX25 allows you to pre-program multiple presets.

Shutback.

A complete loss of RF output power, caused by any one of a variety of faults, including high VSWR, low B+ voltage, high RF current, RF drive failure, external interlock or spark gap.

Surge protection board.

An electrical panel that protects equipment from electrical surges in the ac power supply, antenna or site ground caused by lightning strikes.

VSWR.

Voltage standing wave ratio. This is an expression of the ratio of forward voltage to reverse voltage on the feedline and antenna system. An ideal VSWR of 1:1 provides maximum transmitter-antenna efficiency.

Page 5-2 Issue 6.0 2019-01-31

NX15/NX25 OPERATIONS AND MAINTENANCE MANUAL

Document: NHB-NX15-NX25-OPS

Nautel Limited

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Hackett’s Cove, NS Canada B3Z 3J4

Toll Free: +1.877.6NAUTEL (662.8835)

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Phone: +1.902.823.3900 or

Fax: +1.902.823.3183

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