Safety Notice - Fmuser FM Radio Station, Television Statioin, low

Safety Notice - Fmuser FM Radio Station, Television Statioin, low 500W and 1KW

Analog TV Transmitter

User’s Manual


This product is the all solid-state Single-channel TV Transmitter, it adopts professional TV exciter, and it can use the single/duel exciter configuration, switching automatically.

This transmitter has a variety of linear and non-linear pre-correction function, carrier frequency offset, and precision bias (with external precision reference source) function.

It can prefabricate and control the half-power output, and it has remote control telemetry interface.

The power amplifier used LDMOS FET, the analog and digital are both compatible, and it used high-quality switch parallel power.

The power amplifier and power supply are both used hot-plug devices.

The power loss and standing wave of the one-time synthesis power combiner is small.

The module of power amplifier display the working parameters in real-time.

The whole machine has the protection of over-current, over temperature, over power and over-standing wave ratio.

The master touch screen displays the working parameters of the whole machine and the module of power amplifier (PA) in real-time.

The 1KW transmitter is installed in one 19inch chassis; it’s suitable for medium or small TV station.


● The whole machine is single-channel, image with audio together.

● The redundant configuration design can reduce the rate of inactive to zero.

The exciter redundancy design: the main exciter and its spare exciter can switch automatically (the spare exciter is optional). When the main exciter broke down, it can switch to the spare exciter uninterrupted.

The power amplifier redundancy design: multiple amplifiers integrated; the modules of PA are high-consistency. These two exciters are the spare one with each other and can exchange easily.

The power supply redundancy design: parallel current sharing power from multiple switching power supply; the computer can monitor power supply’s working condition and adjust its working condition automatically.

● The management and monitoring are intelligent and on network, it has the external PC interface.

● It has the technical data detection, monitoring systems and full-featured computer control software with auto-diagnostic function. All technical parameters can be read through the LCD display panel.

● Comprehensive protection measures can reduce the damage of equipments.

This machine has protection about no video; VSWR is too large, overheating, over-stimulus, missing phase protection and lightning protection. The switch has protection about overvoltage, over current, under voltage, over temperature, short circuit and lightning protection.

● All power supplies are switching power supplies; high efficiency, excellent regulator range, strong adaptable from the change of the external voltage.

● It adopts modular design concept.

● Hot-pluggable design: power amplifier and switching power are supporting the Hot-plug, it’s easy to debug and maintenance; improve the reliability.

● The fan is built-in the chassis, the transmitter has a compact structure and a beautiful shape.

Technical Specifications:

Overall performances:

1. Working frequency: UHF 13~48 Channel arbitrary choice

2. Output power: 500W/1KW

3. Output impedance: 50Ω

4. VSWR of output load impedance: ≤1.12

5. Inter-modulation distortion: ≤-50dB

6. Useless transmission: In adjacent channel≤-40dB

Out adjacent channel≤-60dB

7. RF output interface: Φ40

8. Power supply: Three-phase 380V Power Consumption


9. Shape size: 1070mm×667mm×955mm

10.Weight: 150KG

Image performance

1. Video frequency input level: 1V


positive polarity

2. Video frequency input impedance: 75Ω

3. DG: ±5%

4. DP: ±5°

5. Luminance nonlinear: ≤10%

6. Group delay: ≤±60ns

7. Signal-to-clutter ration of low frequency period interference: ≥50dB

Sound performance:

1. Audio input level: 0dBm±6dB

2. Audio input impedance: 10KΩ (imbalance)

600Ω (Balance)

3. Maximum frequency deviation: ±50KHz

4. Harmonic distortion: ≤1%

5. The amplitude frequency characteristics: ±1dB

6. Signal-to -clutter: ≥60dB

Please notice this

1. Read safety notice first

2. A 50 Ohm dummy load or antenna and cable must be connected before turning power on, Avoid water going into the connecters or the cable.

3. Exciter’s operating frequency must be set to the same frequency of the transmitter.

4. Please read System Control Logic section to understand how the system works.

5. Setting all parameters before turning on amplifier’s power (Please read the Power On Sequence section).


Safety Notice-----------------------------------------------------------------4

Special Reminds-------------------------------------------------------------4

1. Power on Sequence ------------------------------------------------------5

2. Control System Introduction ------------------------------------------7

3. Operation Instructions -------------------------------------------------10

Safety Notice

1.1 Please read the following safety points, in order to avoid accidents and prevent connectors to be broken.

1.2 Only the qualified maintenance workers can operate the device.


. . . . a. Use proper power cord. Other wise, it may cause the fire; b. Connect the machine to ground through a wire with resistance less than 4

Ohm to prevent from electrical shock. c. Use the proper fuse. d. Keep good ventilation.

1.4 Please don’t disassemble and repair by yourself when it’s broken down.

Please send to the professional service department to solve the problems.

1.5 Please don’t install the machine in the moisture place;

Please notice this:

connected, carefully keep away water into connecters and cable. whole display operation on the LCD display screen, completely realized the software, the operation is very simple and rapidly. Please ensure you have read through the following statement about the software’s use illustration before you turn on the equipment.

Safety Notice

1. Please read the following safety points, in order to avoid the accidents and prevent the connecting machines to be broken.

2. Only the qualified maintenance workers can operate the service.

3. P

. e. Use the proper wire. If not, it will cause the fire and the bodily injury; f. Ensure the machine connect the ground. Please confirm whether the machine has connected the ground, through the wire and the lead, to prevent the electric shock. g. Use the proper fuse. Please use the stipulated type and rating fuse. h. Provide good ventilation. This machine adopts the natural convective radiation. Fix it correctly to keep it radiating well.


. . . . .. .. . .. . . ... .. .. . . down.

Please send to the professional service department to solve the problems.


Please don’t assemble the machine in the moist environment;

Please don’t assemble the machine in the easy exploding environment;

Please don’t repair by yourself.

5. If you have any other questions, please connect with us.


This series TV transmitter is an excellent product that owns the highest and newest technology. The whole machine adopts the latest TV signal processing technology.



This series TV transmitter displays the operation parameters of the modulator on large LCD screen in real time Its particular

FOUR_KEY design, you can conveniently and fast modify, view the operation parameter and the statement of the transmitter in any time.

Technical Specifications

. Technical Specifications


AC220V±10% 50Hz


Heat Abstraction Forced Convection


Output Power: Adjustable Continuous to rate power


Output Impedance 50Ω


RF Output Linker Standard N-50Ω or 7/16

physical property


Temperature Range 5℃~+40℃


Relative Humidity <95%


Height Above Sea Level <4500m

Panel Function Description

I 、

Front panel picture

1 —Amplifer;








2REAR panel function description








1 — AC Socket for amplifer Fuse 5A

2 — RF input Port

3— RF Output Port

4 — AV Input

5 — AC Socket for modulator

6 — DC controling line

7— AC Connector 220V

8— DC Connector red=”+” black= “-”


PA Front panel function description

1 —POWER: power supply OK;

2—MODULATER: Modulater POWER supply OK

3—VOLTAGE: PA VOLTAGE over alarm;

4—CURRENT: PA Current over alarm;

5—V.S.W.R VSWR is 1.30light, 1.50 transmitter restart。

After restart three times,if the alarm condition do not unchain,

The transmitter will wait for checking.

6—RF : RF power over alarm.

7 —LCD display Screen

8 —key-press

UP and LEFT light cursor

9 —key-press


10 —key-press

DOWN and RIGHT light cursor

11—Power Switch

Special Tips

l Turn on RF power after setting all other parameters l CAN address of exciters and amplifier modules are set in factory, please do not change it. l The transmitter is AGC controlled when CAN AGE in exciter is ENABLED. l When REMOTE of CCU is enabled, all parameters of CCU can only be changed remotely. l RF SWITCH of CCU is a general switch. l To use period control on CCU, set period first, and then enable PERIOD

CONTROL and finally set RF SWITCH on. l Always disable exciter’s period control function.

1 Power On Sequence

1.1 Check all connections

l Combiner to dummy load or antenna l Amplifier modules to combiner l Divider to amplifier modules l Switcher to divider l Exciters to switcher l Main exciter to backup exciter l Audio to main exciter and backup exciter l Communication cables l CCU LOCKOUT to Exciter LOCKIN l Power cable

1.2 Turn on System Control Power

Check running status in STATUS display page. Make sure all modules are in normal status.

1.3 Set Exciter Parameters (Produced by this company)

Main and backup exciter parameters setting must be identical!!! l Frequency: must set to the same frequency as the transmitter allowed. l Modulation deviation: 75KHz l Pilot deviation: 7.5KHz l Audio Input: depends on audio source. l Audio Gain: adjust audio level according to its input level. Adjusted audio level should be around 0dBm. l Power Percentage: 0% l Period Control: disabled l Remote Control

“Remote = enabled” for power automatic control.

“Remote = disabled” for power manual control. l RF Switch: ON l If other manufacturer’s exciter is used, refer to operation manual they provided.

1.4 Set CCU parameters

l Turn off RF Switch: RF Switch = OFF l Power Percentage: 0%--100% l Period Control

If period control is needed, set three periods first and then enable Period

Control (Period Control =Enabled).

If period control is not needed, just disable Period Control (Period Control =


1.5 Turn on the Power Amplifier

l Turn on the Power Supply of the Amplifier PA l Turn on the RF Switch: RF Switch = ON

1.6 Adjust RF power

l For automatic control, just set power in CCU. l For manual control, increase exciter’s power slowly; meanwhile watch RF power and other information displayed on CCU’s LCD.

2 System Control Introduction

2.1 Main Control Function

l Data collection and display from 6 amplifiers which include voltage, current, temperature, running status, forward power and reflect power. l Combiner data acquisition and display which include temperature, forward power and reflect power. l Data collection and display from 2 exciters which include frequency, exciter working status, forward power and reflect power. l Amplifier modules and exciters on line detection. l RF power control and power supply control.

2.2 System Internal Network

Internal network is built through CAN bus. CCU, amplifier modules and exciters are connected on the CAN bus on which the CCU read information from amplifier module’s and exciter’s and control the exciter’s power to make the machine’s

Automatic Power Control work.

Each unit on the CAN bus have a unique CAN address and the setting rules are as below:

Exciter A: 1

Exciter B: 2

Power Amplifier Unit A: 3 (DIP switch)

Power Amplifier Unit B: 4 (DIP switch)

Power Amplifier Unit C: 5 (DIP switch)


If there is no corresponding unit or use the other manufacturer’s exciter, the corresponding CAN address is reserved.

If the exciter breaks off from the CAN bus, the machine’s Automatic Power Control can not work.

If an amplifier module breaks off from CAN bus, the central control unit will regard forward power and reflected power of the amplifier as zero. Consequently, CCU unbalance power control strategy will be deployed.

Other manufacturer’s exciter can be used but can not be connected on the internal

CAN bus network not matter there is a CAN interface or not due to the restriction of the internal communication protocol.

You can confirm if a unit is connected on the CAN bus through the status display page on CCU’s LCD.

2.3 (CCU) Remote Control

CCU has a RS232 interface that can connect to a computer for the remote control purpose. The remote computer can read the following datum: l Equipments’ type and profile, such as nominal power, frequency, number of amplifier modules, maximum power of amplifier module and number of exciters. l Machine’s forward power; reflect power; temperature and other working status. l Exciter’s operating frequency; forward power; reflect power and other working status. l Each amplifier unit’s forward power; reflect power; temperature; voltage; current and other working status.

The remote computer can do following controls: l RF Switch l Setting Power

We can provide software (not free) running on WINDOWS operating system for remote control; and also provide protocol in order for customer to embed our system in their remote control system.

Our company’s exciter can also be individually controlled remotely, but we strongly recommend using the remote control interface of CCU as the only remote control interface.

If other manufacturers’ exciter is used, remote system can not read the related information of the exciter through the CCU.

CCU’s parameters can not be changed locally when remote control is enabled

(refer to remote page operation).

2.4 Automatic Power Control & Manual Power Control

Automatic Power Control means to maintain a constant transmission power under normal working condition. In abnormal working condition, CCU tries to keep the output power as high as possible but the first thing is to keep the transmitter in safety condition.

Only with ZHC’s exciter, the Automatic Power Control function is able to work.

The Automatic Power Control function is enabled when exciter’s CAN AGC is set to enabled, otherwise the system is in Manual Power Control mode.

In manual power control mode, the output power is not controlled by CCU (CCU can not control exciter’s power). So, the machine’s output power would be fluctuated with the temperature or other factors change. In the abnormal working condition, the system will not automatically reduce its output power because the exciter’s power is out of control in manual control mode. In extreme case, the system will powered-off for protection.

2.5 RF Output Control

2.5.1 CCU RF Switch l When RF Switch is off, turn off RF power and power supply. l When RF Switch is on and Period Control is disabled, turn RF power on to setting power. l When RF Switch is on and Period Control is enabled, RF power is controlled by

Period Control function (see Period Control).

2.5.2 CCU Period Control

When RF Switch is on and Period Control is enabled, the control method is as follows:

The system reads current time through RTC and check whether current time is falling into any of the three periods. If yes, turn on RF power to its period setting power, else turn off RF power. A period is invalid if start time is greater than or equal to end time. Invalid time period is ignored in Period Control (Current time will never fall into an invalid period). If three periods are all invalid, turn RF power off for ever.

Invalid period is useful when only one or two period is needed.

It is suggested that disable Period Control before correcting date and time or changing period’s start and end time to avoid instantaneous undesired RF Switch on and off.

2.6 System Protection

AIn automatic control mode, if RF output power is not able to reach to setting

power, it may cause by:

l Combiner temperature is above 70. l Combiner’s reflect power is above the warning value (more than 2% of the machine’s nominal power). l Unbalance power (the power difference between the maximum output power and minimum output power from all the power amplify modules) above the warning value (more than 25% of Power Amplifier’s nominal power). l Power of individual amplifier module above the warning value (more than

2% of Power Amplifier’s nominal power). l One or more amplifier module is not on line.

AIn automatic and manual control mode, if RF output power reboot, it may

cause by:

l Combiner temperature is above 85. l Output power is too high (more than 5% of the machine’s nominal power). l Reflected power is too high (more than 4% of the machine’s nominal power) l Unbalance power is too high (more than 30% of the power amplifier’s nominal power). l Power of individual is too high (more than 5% of the power amplifier’s nominal power).

AIn automatic and manual control mode, if RF output power can not reboot

again, it may cause by:

l Three times failure of power reboot in 10 minutes. l Other hardware reasons.

AThe only way to run the system properly again is to turn off system control

power and amplifier’s power, and then turn on again.

3 CCU Menu Operation

3.1 General Descriptions

The CCU LCD display is divided into 4 functional pages: Main Page, Status Page,

Time Page and Remote Page. Touch screen is used to get through all functions.

Three hidden buttons is used to set and select parameters. When click on the displayed setting parameter, buttons are visible and setting parameter is displayed in reverse video indicating the parameter is in editing. Use UP and DOWN button to change parameter and ENTER to confirm and save it. Click any other area to cancel current editing and restore its old parameter value.

When click on display only item or title or any empty area, buttons are not visible and the system does nothing. So, distinguish whether the parameter is a setting parameter first. But not worry about this, because you can try to click anywhere on the LCD and setting parameters are also specified bellow in each page.

UP or increase, when press and hold for a longer time, it speeds up.

It’s very useful when using it to change wide range parameters.

ENTER, Confirm and Save edited parameter.

DOWN or decrease, when press and hold for a longer time, it speeds up.

3.2 System Boot up

During the system boot up, company logo is displayed until system boot up finish.

After system booting up, it enters to Main Page.


Power Forward: forward power, display only

Percentage: forward percentage setting, setting parameter.

Power Reflect: reflect power, display only.

Frequency: RF frequency, reading from working exciter, display only.

L:/ R: Audio bar, indicating modulating deviation, display only.

For TV transmitter, the main page is slightly different from this.


This page display running status of all components. Click on status block can enter to corresponding component page to see its detail information.

Different color of each component indicate its running status, it is defined as follow:


Normal status


Warning status


Critical status


Not online status l Normal status: system is running in good condition, RF output power keeps constant to setting power. l Warning status: component has some thing wrong (see parameter’s color in the component by clicking on the component block), RF output power remains but may not reach setting power. l Critical status: RF power will reboot. l Not online status: Indicate the component is absent or not connected properly or not powered on or severe communication error occurs. RF output power will drop or turn off.

3.4.1 Reboot Reason

Last Reboot Reason:

--No reboot

--Forward power is too high

--Reflect power is too high

--The temperature of combiner is too high

--Unbalanced power is too high

3.4.2 Combiner Working Status

Forward Power: Combiner Forward Power

Reflect Power: Combiner Reflect Power

Temperature: Combiner Temperature

Module forward power: The Forward Power of each amplifier

3.4.3 Exciter Working Status

Forward Power:Exciter Forward Power

Reflect Power:Exciter Reflect Power

Frequency: Exciter working frequency

On Air: ON---Exciter’s RF power turned on

OFF—Exciter’s RF turned off

L: Exciter left audio

R: Exciter right audio

3.4.4 Power Amplifier Working Status

Status: Working—Power Amplifier is working normally

Booting--Power Amplifier is booting

Blocked--Power Amplifier is on protecting status; Because of the self-protection, it would be rebooted and turns on the RF in 10 seconds when extremely case occurs. If the reboot failed 3 times consecutively, then the power amplifier would turn off the RF permanently until manually disconnect the amplifier’s power and then reconnect (cold reboot).

Absent-- Power Amplifier can not communicate with CCU.

Forward Power: Forward Power of the module

Reflect Power: Reflect Power of the module

Temperature: temperature of the module

Voltage: Amplifier’s power supply voltage, 48V/32V

Current: Each power amplifier unit has four amplifier modules; this column is used to display the current of these four amplifier modules.

3.5 Time & Period Control

Date: Set date or display date. The format is: YY/MM/DD DAY

Time: Set time or display time. The format is: HH:MM:SS

Time Control:

Enabled: Time Period Control is enabled.

Disabled: Time Period Control is disabled.

Period setting: There are three time period in one day, the format is as follow:

Start Time End Time Period Power (%)

Period1 HH:MM HH: MM 0%--100%

Period2 HH:MM HH: MM 0%--100%

Period3 HH:MM HH: MM 0%--100%

Comment: for detail information about time period control refer to System

Control section.

3.6 Remote control

Baud rate: Setting remote communications baud rate.

Address: Setting remote communications address.

Remote: Enabled — parameters can only be changed remotely.

Disabled—parameters can be changed only locally.

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