R.V.R. Television ATVST-CNV TV Transmitter User Manual

Below you will find brief information for TV Transmitter ATVST-CNV. The ATVST-CNV is a TV Transmitter that provides 5W or 10W output power and features a precorrector for improved signal quality.

PDF Download

Document

BLUE VIDEO

(mod. ATVST-CNV)

User Manual

Volume 1

Manufactured by Italy

File Name: 03_ATVST-CNV_ING_1.2.indd

Version: 1.2

Date: 11/12/2008

Revision History

Document History

Date Version

07/12/2007 1.0

01/07/2008 1.1

11/12/2008 1.2

Reason

First Edition

Internal or external adjustment addendum

VHF version integration

Editor

P. Tassin

E. Montagna

ATVST-CNV - User Manual

Version 1.2

R.V.R. Television

Via del Fonditore 2/2c - 40138 - Bologna (Italia)

Telephone: +39 051 6010506

Fax:

Email:

Web:

+39 051 6011104 [email protected]

www.rvr.it

Printed and bound in Italy. No part of this manual may be reproduced, memorized or transmitted in any form or by any means, electronic or mechanic, including photocopying, recording or by any information storage and retrieval system, without written permission of the copyright owner.

ATVST-CNV

3.1 Treatment of electrical shocks

3.2 Treatment of electrical Burns

4.2 Composition

5. Installation and confi guration procedure

6. Front and Rear Panel Description

8.1 ALC

8.2 Display/Precorrector

8.3 IF Modulator Board

8.4 Up converter board

8.5 RF amp unit

8.6 Power Supply Unit

10.1 Operation for the change of channel

10.2 Calibration for the fi lter of channel

11.1 Operation for the setting of pre-corrector

33

41

32

22

23

5

19

3

2

1

User Manual Rev. 1.2 - 12/11/08

ATVST-CNV

Rev. 1.2 - 12/11/08

This page was intentionally left blank

User Manual

ATVST-CNV

IMPORTANT

The lightning fl ash with arrowhead, within a triangle, is intended to alert the user of the presence of dangerous voltage that may constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the equipment.

• General Warnings

This equipment should only be operated, installed and maintained by “trained” or “qualifi ed” personnel who are familiar with risks involved in working on electric and electronic circuits.

“Trained” means personnel who have technical knowledge of equipment operation and who are responsible for their own safety and that of other unqualifi ed personnel placed under their supervision when working on the equipment.

“Qualified” means personnel who are trained in and experienced with equipment operation and who are responsible for their own safety and that of other unqualifi ed personnel placed under their supervision when working on the equipment.

WARNING: Residual voltage may be present inside the equipment even when the ON/OFF switch is set to

Off. Before servicing the equipment, disconnect the power cord or switch off the main power panel and make sure the safety earth connection is connected.

Some service situations may require inspecting the equipment with live circuits. Only trained and qualifi ed personnel may work on the equipment live and shall be assisted by a trained person who shall keep ready to disconnect power supply at need.

Operation of this equipment in a residential area may cause radio interference, in which case the user may be required to take adequate measures.

The specifi cations and data contained herein are provided for information only and are subject to changes without prior notice. R.V.R. Television disclaims all warranties, express or implied.While R.V.R. Television attempts to provide accurate information, it cannot accept responsibility or liability for any errors or inaccuracies in this manual, including the products and the software described herein.

R.V.R. Television reserves the right to make changes to equipment design and/or specifi cations and to this manual at any time without prior notice.

• Notice concerning product intended purpose and use limitations.

This product is a radio transmitter suitable for frequencymodulation audio radio broadcasting. Its operating frequencies are not harmonised in designated user countries.

B e f o r e o p e r a t i n g t h i s e q u i p m e n t , u s e r m u s t obtain a licence to use radio spectrum from the competent authority in the designated user country.

Operating frequency, transmitter power and other characteristics of the transmission system are subject to restrictions as specifi ed in the licence.

R.V.R. Television shall not be liable for injury to persons or damage to property resulting from improper use or operation by trained/untrained and qualifi ed/unqualifi ed persons.

WARNING: The equipment is not water resistant.

Any water entering the enclosure might impair proper operation. To prevent the risk of electrical shock or fi re, do not expose this equipment to rain, dripping or moisture.

Please observe local codes and fi re prevention rules when installing and operating this equipment.

WARNING: This equipment contains exposed live parts involving an electrical shock hazard. Always disconnect power supply before removing any covers or other parts of the equipment.

Ventilation slits and holes are provided to ensure reliable operation and prevent overheating; do not obstruct or cover these slits. Do not obstruct the ventilation slits under any circumstances. The product must not be incorporated in a rack unless adequate ventilation is provided or the manufacturer’s instructions are followed closely.

WARNING: This equipment can radiate radiofrequency energy and, if not installed in compliance with manual instructions and applicable regulations, may cause interference with radio communications.

WARNING: This equipment is fi tted with earth connections both in the power cord and for the chassis.

Make sure both are properly connected.

User Manual

La R.V.R. Television warrants this product to be free from defects in workmanship and its proper operation subject to the limitations set forth in the supplied Terms and Conditions.

Please read the Terms and Conditions carefully, as purchase of the product or acceptance of the order acknowledgement imply acceptance of the Terms and Conditions.

For the latest updated terms and conditions, please visit our web site at WWW.RVR.IT. The web site may be modifi ed, removed or updated for any reason whatsoever without prior notice.

The warranty will become null and void in the event the product enclosure is opened, the product is physically damaged, is repaired by unauthorised persons or is used for purposes other than its intended use, as well as in the event of improper use, unauthorised changes or neglect.

In the event a defect is found, follow this procedure:

1 Contact the seller or distributor who sold the equipment; provide a description of the problem or malfunction for the event a quick fi x is available.

Sellers and Distributors can provide the necessary information to troubleshoot the most frequently encountered problems. Normally, Sellers and Distributors can offer a faster repair service than the Manufacturer would. Please note that Sellers can pinpoint problems due to wrong installation.

2 If your Seller cannot help you, contact R.V.R. Television and describe the problem; if our staff deems it appropriate, you will receive an authorisation to return the equipment along with suitable instructions;

3 When you have received the authorisation, you may return the unit. Pack the unit carefully before shipment; use the original packaging whenever possible and seal the package perfectly. The customer bears all risks of loss (i.e., R.V.R. shall not be liable for loss or damage) until the package reaches the R.V.R. factory. For this reason, we recommend insuring the goods for their full value. Returns must be sent on a C.I.F. basis (PREPAID) to the address stated on the authorisation as specifi ed by the R.V.R. Service Manager.

Rev. 1.2 - 12/11/08

1 / 44

ATVST-CNV

Units returned without a return authorisation may be rejected and sent back to the sender.

4 Be sure to include a detailed report mentioning all problems you have found and copy of your original invoice (to show when the warranty period began) with the shipment.

Please send spare and warranty replacement parts orders to the address provided below. Make sure to specify equipment model and serial number, as well as part description and quantity.

Television

Via del Fonditore, 2/2c

40138 BOLOGNA ITALY

Tel. +39 051 6010506

All personnel engaged in equipment installation, operation and maintenance must be familiar with fi rst aid procedures and routines.

3.1 Electric shock treatment

3.1.1 If the victim is unconscious

Follow the fi rst aid procedures outlined below.

• Lay the victim down on his/her back on a fi rm surface.

• the neck and tilt the head backwards to free the airway system (Figure 1).

• Do not stop chest compressions while giving artifi cial breathing.

• Call for medical help as soon as possible.

3.1.2 If the victim is conscious

• Cover victim with a blanket.

• Try to reassure the victim.

• Loosen the victim’s clothing and have him/her lie down.

• Call for medical help as soon as possible.

3.2 Treatment of electric burns

3.2.1 Large burns and broken skin

• Cover affected area with a clean cloth or linen.

• Do not break any blisters that have formed; remove any clothing or fabric that is stuck to the skin; apply adequate ointment.

• Administer adequate treatment for the type of accident.

• Get the victim to a hospital as quickly as possible.

• Elevate arms and legs if injured.

If medical help is not available within an hour, the victim is conscious and is not retching, administer a solution of table salt and baking soda (one teaspoon of table salt to half teaspoon of baking soda every 250 ml of water).

Have the victim slowly drink half a glass of solution for four times during a period of 15 minutes.

Stop at the fi rst sign of retching.

Figure 1

• If needed, open the victim’s mouth and check for breathing.

• If there is no breathing, start artifi cial respiration without delay (Figure 2) as follows: tilt the head backwards, pinch the nostrils, seal your mouth around the victim’s mouth and give four fast rescue breaths.

Do not administer alcoholic beverages.

3.2.2 Minor burns

• Apply cold (not ice cold) strips of gauze or dress wound with clean cloth.

• Do not break any blisters that have formed; remove any clothing or fabric that is stuck to the skin; apply adequate ointment.

• If needed, have the victim change into clean, dry clothing.

• Administer adequate treatment for the type of accident.

• Get the victim to a hospital as quickly as possible.

• Elevate arms and legs if injured.

Figure 2

• Check for heartbeat (Figure 3); if there is no heartbeat, begin chest compressions immediately (Figure 4) placing your hands in the centre of the victim’s chest (Figure 5).

Figure 3 Figure 4 Figure 5

• One rescuer: give 2 quick rescue breaths after each 15 compressions.

• Two rescuers: one rescue breath after each 5 compressions.

2 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

The package contains:

1 ATVST-CNV

1 User Manual

1 Mains power cable

The following accessories are also available from Your R.V.R. Dealer:

• Accessories, spare parts and cables

RVR Elettronica’s exciter ATVST-CNV is designed for to match important parameter in broadcast world.

Infact principal demand of broadcasting corporation is rudgness and reliability.

The transmitter ATVST-CNV has been built in a 19”standard rack 1U, 550 mm depth.

The equipment is inside modularised, designed for an easy maintenance and service due to a failure of one module of the system. Final power amplifi er is located on rear panel, performed by forced air cooling.

The power supply unit is fi tted in a box for servicing and can be easily removed in case of failure.

The frontal board identifi ed as ALC PRECORRECTOR It integrate function of

MOTHER BOARD, ALC PRECORRECTOR and CPU.

The ALC PRECORRECTOR with an analogical signal present on its 15 pin connector type D can control the output power of an external power amplifi er within ±1dB.

An high performance 16 bit microcontroller is “supervisor unit” of all Exciter.

Complete information of many measurement are shown on LCD display. Infact operative channel, direct power to load, refl ect power from load, voltage supply, temperature of heat sink and video/sync level are measurement selectable with rotary encoder on front-panel

A RS232 standard interface is available for remote controll of transmitter. All information can be send to remote PC for monitoring main functions.

User Manual Rev. 1.2 - 12/11/08

3 / 44

ATVST-CNV

In standard confi guration, ATVST-CNV exciter is composed by:

ALC

Controller of all Exciter- RS 232 interface – Analog measurement acquisition.

Interconnection with other board.

Display/Pre-corrector

User interface and standard predistorsion unit for pre-correction fi nal power.

IF modulator module

Vision/audio IF carrier generator and modulator.

UP converter module

High performance mixer for frequency conversion IF to RF channel

Frequency synthetizer PLL oscillator with very low phase noise.

RF amp unit

Power RF amplifi er 5 W o 10W.

Directional Coupler

For direct/refl ect power measurement.

Switching supply unit

Power converter with thermal and short circuit protection. Low ripple and noise. Mains voltage from 100 to 250 Vac (47-63Hz).

Additional precorrector

As alternative to resident precorrector in Prec. ALC. Furnish more performance for RF amp 10W.

General performance:

• Internal Modular System.

• Forced air cooling.

• Precorrection with three slope control on front panel.

• Predisposition to professional precorrector, it furnish more performance at

10W.

• Synthesized oscillator with 25Hz step (precision 1Hz).

• The principal function are regulated from frontal panel by rotary encoder.

4 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

5. Installation and confi guration procedure

The equipment features an LCD with two lines by 16 characters that displays a set of menus.

5.1 Transmitter Maintenace

5.1.1 Installing and Switching-On Operations

√ Verify that the equipment earth cable is correctly connected either to a chassis ground point or to other earthing point. Connect the cable to the earth clamp placed in the equipment back side.

√ Verify by a tester that the power supply voltage is into the request tolerance and that is V=110 or 220 VAC +/- 20% and F= 50-60Hz. Connect the feeder cable to the standard Europa socket , placed in the equipment back side.

√ Connect either a transmitting antenna or a load of 20W 50 ohm. to the RF output connector.

On the DISPLAY LCD will appear all the function, controls, measures and the failure (if present).

IF THE EXCITER OPERATES CORRECTLY, THE FOLLOWING SITUATIONS

WILL BE PRESENT:

All green leds on, all leds red off, PREC OFF led on, EXT 5MHZ led on (if is present).

5.1.2 Preliminary Checks by Diplay Module

Unpack the exciter and immediately inspect it for transport damage. Ensure that all connectors are in perfect condition.

SIGNAL NOMINAL VALUE

VIDEO 700mV

PUD Depending the power request during the order

PUR 0,10W

TEMP 54°C

IF LEV 0dbm

DEV 50KHz

+7V 7V

+15V 15V

-15V -15V

+26V +26V

CONDITION O %

r 5%

Standard r 1 r 10%

> +26V

In Fault (Economy, OL not Lock

External disable etc.)

User Manual Rev. 1.2 - 12/11/08

5 / 44

ATVST-CNV

5.2.1 ATVST-CNV Transmitter Function

ATVST-CNV Start, fi rst screen for 5 sec.

Default screen (after 2 minuts return in Default screen).

Turn the rotatory switch to scroll to the next screen.

6 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

5.2.2 Menu

Push rotatory switch for to enter to the function, or turn counter-clockwise for scroll.

User Manual Rev. 1.2 - 12/11/08

7 / 44

ATVST-CNV

5.2.3 Measure Level Selection

Push to rotatory switch to enter. There are some measure:

8 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

5.2.4 Power Level Selection

If the ALC is MANUAL: turning the knob you can change the power output.

5.2.5 Power Level Selection

If the ALC is AUTOMATIC: turning the knob you can change the power output.

5.2.6 Precorrector On/Off Selection

Push the rotatory switch to enter: indicates the state of Precorrector.

User Manual Rev. 1.2 - 12/11/08

9 / 44

ATVST-CNV

5.2.7 Setting Selection

Push to rotary switch to enter to the menu.

10 / 44

Rev. 1.2 - 12/11/08 User Manual

5.2.8 Video Setting Selection

Regulation of video settings.

ATVST-CNV

5.2.9 Video Level Selection

Video level regulation.

5.2.10 White Clipper Selection

Set by default to 751mV.

User Manual Rev. 1.2 - 12/11/08

11 / 44

ATVST-CNV

5.2.11 Group DLY On/Off Selection

Insert Group delay function (ON or OFF)

5.2.12 Sound Settings Selection

Regulation of audio settings.

12 / 44

Rev. 1.2 - 12/11/08 User Manual

5.2.13 Audio Level Selection

Input audio level regulation.

5.2.14 IF Audio Level Selection

5.2.15 IF Audio ON or OFF Selection

ATVST-CNV

User Manual Rev. 1.2 - 12/11/08

13 / 44

ATVST-CNV

5.2.16 Preemphasis ON or OFF Selection

5.2.17 CH Selection

Channel frequency regulation. Turn for change channel, press to select OFFSET, turn for change OFFSET, enter for ESC.

14 / 44

Rev. 1.2 - 12/11/08 User Manual

5.2.18 ALC MODE Selection

Indicates power control (AUTOMATIC or MANUAL).

ATVST-CNV

5.2.19 IF Source INT/EXT Selection

External IF channel selection.

5.2.20 APL ON/OFF Selection

APL function ON / OFF.

User Manual Rev. 1.2 - 12/11/08

15 / 44

ATVST-CNV

5.2.21 Economy On/Off Selection

Economy function ON / OFF.

5.2.22 Timer Selection

In this menu you can select the date and time to switch the IF input between internal and external.

16 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

5.2.23 Time Selection

Rotating the knob we can regulate the parameters. Push to confi rm.

5.2.24 Date Selection

Rotating the knob we can regulate the parameters. Push to confi rm.

5.2.25 Set IF Ext Selection

Rotating the knob we can regulate the switching hours. Push to confi rm.

5.2.26 Set IF Int Selection

Rotating the knob we can regulate the switching hours. Push to confi rm.

User Manual Rev. 1.2 - 12/11/08

17 / 44

ATVST-CNV

5.2.27 Set IF Int Selection

Rotating the knob we can regulate the switching hours. Push to confi rm.

5.2.28 Status Alarms Selection

In this screen it visualizes the list of the possible alarms.

18 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

6. Front and Rear Panel Description

This section describes the components found on the front and rear panel of

ATVST-CNV.

Figure 6.1: 5/10W UHF SYNT. TV TRANSMITTER - FRONT VIEW

[1] AIR FLOW

[2] LO LOCK

[3] ALC LOCK

Air grille.

Green LED - When is lighted LO is coupled.

Green LED - When is lighted ALC is ON, when is blinking ALC is working.

[4] FAULT

[5] A.P.L.

Red LED - When is lighted is in failure.

Red LED - When is lighted not there is Video signal (Average Power

[6] CONTRAST

Limit).

Display contrast trimmer.

[7] BIAS, PHASE, LEVEL Trimmer for equipment precorrection (standard precorrection).

[8] PREC. OFF

[9] IF

[10] RF

[11] VIDEO PRES

[12] GROUP DELAY

[13] ECO

[14] WHITE CLIP

Yellow LED - When is lighted the PREC is OFF.

SMB Male - IF Monitor 0dBm.

SMB Male - Outlet RF Monitor.

Green LED - Input Video present, is lighted when the video is present.

Green LED - When is lighted inserted Group Delay correction.

Green LED - When is lighted the A.P.L. is over of 2 minuts.

Green LED - When is lighted white level is over predefi ned

[15] DISPLAY

[16] ROTATORY ENCODER threshold.

Display LCD 2 raws, 16 characters.

Scroll menù for read the measure, outlet regulation, inlet Video level, Carrier level, Sound IF, etc..

[17] LO

[18] SWITCH ON OFF

SMB Male - LO Local oscillator monitor

Power supply switch.

User Manual Rev. 1.2 - 12/11/08

19 / 44

ATVST-CNV

6.2 Rear

Figure 6.2: 5/10W UHF SYNT. TV TRANSMITTER - REAR VIEW

[1] MAINS

[2] AIR FLOW

[3] IF IN

[4] RF IN

[5] VIDEO IN

[6] LEFT

[7] RS232

[8] FUSE MAINS

[9] 5 MHZ IN

[10] 5 MHZ OUT

[11] RIGHT

[12] TELEMETRY

[13] RF OUT

Connectors for 100-240 V 50-60 Hz mains power supply.

Air grille.

BNC Male - IF external input.

RF Input (Repeater confi guration).

BNC Female - Video input.

Mini XLR 3 pin audio connector - Audio input left channel.

DB9 Female - RS232 connector.

Mains power supply fuse.

BNC female - External 5Mhz input.

BNC female - 5Mhz output.

Mini XLR =3 pin audio connector - Audio input left channel.

DB15 Female - IN / OUT Telecontroller signal.

N-type - RF ouput connector.

20 / 44

Rev. 1.2 - 12/11/08 User Manual

6.3.1 RS232

Type: Female DB9

1 NC

2 SDA

3 SCL

4 NC

5 GND

6 NC

7 NC

8 NC

9 NC

6.3.2 Left / Right

Type: Female mini XLR

1 GND

2 Positive

3 Negative

ATVST-CNV

User Manual Rev. 1.2 - 12/11/08

21 / 44

ATVST-CNV

General

Frequency range

Output power

Power supply

Power consumption

Operating temperature

5 W power amplifi er

10 W power amplifi er

Power stability

Harmonics suppression

Video connector

Audio connector

Enabling IN/OUT ed ALC connector

RS 232 connector

Video

Input level

Differential gain

Differential phase

Group delay

Level frequency response

Signal to noise ratio

Audio

Input level

Level frequency response

Harmonic distortions

Signal to noise ratio

470÷860 MHz (UHF version)

170÷230 MHz (VHF version)

5/10 Watt

90-230 Vac 50-60 Hz

50 VA / 80VA / 160 VA

0 ÷ +45 °C

IMD (-8; -10; -16 dB)

-56 dB @ 2 W (pre-correction off)

IMD (-8; -10; -16 dB)

-65 dB @ 2 W (pre-correction on)

IMD (-8; -10; -16 dB)

-52 dB @ 10W(pre-correction off)

IMD (-8; -10; -16 dB)

-60 dB @ 10W(pre-correction on)

± 0,5 dB

<- 60 dBc (with output fi lter)

BNC female

Mini XLR

15 pin tipo D

9 pin type D

1 Vpp / 75Ω

< 5%

< 5°

± 50 nS

± 0,5 dB

<-60 dB (weighted)

0 dBm ± 6dB / 600Ω (optional 10 KΩ)

± 0,3 dB

(30Hz±15Khz)

< 0,4 %

> 65 dB

(30Hz±15Khz not weighted RMS with deemphasis)

Protections

Max VSWR

Max Idc

Max Temperature

Max output power

22 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

The fi gures below provide an overview of ATVSC-CNV.

To antenna

Directional

Coupler

Audio Right Video In Audio Left

P.A

Stereo Coder

(Optional)

Video/Audio

Modulator

Up converter

+15V -15V +5V +26V

A.L.C

Power supply

Mains

Display +

Pre-Corrector

Optional Precorrector

Figure 8.1

Following is a brief description of the different module functions; all diagrams and board layout diagrams are included in the “Technical Appendix” Vol.2.

Brief functional description of main unit in Exciter ATVST-CNV.

Functional Description:

• Analog and digital acquisition of all signal measurement and readout on LCD display. Setting (with I2C bus protocol) frequency of PLL local oscillator for operative channel .Detecting of functional failure and inhibit of RF power amplifi er in critical situation.

• Remote communicationwith RS 232 interface .

• Microcontroller : pic 18F8620 Microchip 16 bit.

• Clock processor : 19.66 MHz.

• Data speed of RS 232 : 9600 Bps

• Video analog processorfor complete predistortion video signal.

User Manual Rev. 1.2 - 12/11/08

23 / 44

ATVST-CNV

• Luminance predistortion 0->100%.

• Phase variation of luminance signal. ALC function with programmable attenuator in feedback mode with rf directional coupler.

• Automatic or manual commutation (through timer) on external IF.

8.1.1 CPU- Function

The function CPU is realized by MICROCONTROLLER PIC 18F8620 from the

MICROCHIP (U12). This processor realizes all the measures, the signalings and the necessary controls to the correct operation of the apparatus, besides the CPU communicates with the outside through a serial port RS232 (U15).

The CPU also manages the visualization on the display (2 lines for 16 characters) and the ROTARY SWITCH. It is implement the software operational of the

AUTOMATIC LEVEL CONTROL on the outout power.

Here are present all the signals of measure, and there are the 2 peak detectors that respectively measure the PUD RF and PUR RF. Besides the connector is present for the remote controls and the indications.

8.1.2 5MHZ Function

The 5MHZ RF contains the necessary circuits to recognize the presence or less than a external 5MHZ or a HIGH STABILITY BOARD (Rif. 5MHZ TXCO OPTIONAL).

The automatic commutation gives priority to the presence of the external 5MHZ ; in lack of this, the inside reference is selected (Optional). If both are not present, the led 5MHZ, present on the outside it will be off.

8.1.3 PWS Function

In this board is present the Power Connector (J10); It goes to the powers necessary to the operation of the board. The powers will be distributed to the various DIN connectors 52x2 of the function MOTHER. There are 2 regulators that stabilize the + 5VD and +5VA and the -5VA. The +15V is fi ltered only.

8.1.4 Mother Board Function

The Mother Board function is the “interconnection ” for 3 module (UP Converter,

IF Modulator, Stereo Modulator), and unit of Exciter.

There are three 52x2 F Eurocard connector with two minicoaxial connector (Not used).

Mother board includes also ALC rectifi er amplifi er and control logic for 5 MHz

TXCO optional High Stability oscillator.

24 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

Provides user interface, consists of display, led and rotatory switch. It furthermore includes standard precorrector composed of 9 adjustments divided into three cells.

The precorrector is composed from N° 3 cells for the distorsion, where for each they are available the regulation of BIAS, phase and amplitude. The insertion and the disconnection of precorrector can be done selecting the menù from the rotatory switch.

The precorrector function is realized through a circuit to diodes commonly used that it produces the necessary precorrection to according to of as the diodes are polarized.

Functional Description:

• Video if carrier generator.Audio if carrier generator.Video and Audio modulation.

Analog processor for sync extraction.

• Video and sync level acquisition.

• White and black clipping block.

• Group delay correction .Audio preenphasis correction. Video-audio intercarrier

PLL logic.

• Video Carrier frequency : 38.9 (PAL B,G) / 45.75 (NTSC M) MHz

• Audio Carrier frequency : 33.4 (PAL B,G) / 41.25 (NTSC M) MHz

• Audio input impedance : 600 Ohm @ 1 KHz

• Video input impedance : 75 Ohm

• IF output level : 0 dBm ( typical) –50 Ohm

8.3.1 Vision Function

The signal Video enters through the Connector MCX (J1) and it goes to the varying gain amplifi er (U29) LMH6504. The output of amplifi cation goes to the circuit DC

RESTORE (U23) EL4093. The output of DC RESTORE drives the circuit WHITE

CLIPPER (U24) AD8036. The signal so essay is modulated to 38.9 MHZs by the circuit U26 MC1496 (Balanced Modulator). The signal so gotten is fi ltered by the fi lter SAW (FLT1) that it eliminates the lateral band and it realizes the vestigial modulation (VSB) .The fi lter SAW attenuates around 30dB, so to output fi lter, has been inserted an amplifi er (U27) AG30363.

The regulations of the threshold of the WHITE CLIPPER and the input Video

Gain are realized by the electronic trimmer (U25) AD5242, that it is checked by the CPU.

User Manual Rev. 1.2 - 12/11/08

25 / 44

ATVST-CNV

In this board the circuits are inserted also: Synchronisms detector (U21) LM1881, circuit for indication of the happened WHITE CLIPPER (U20) LM393, and synchronism level measure circuits ,and the Video level signal (U22).

The relay K2 inserts or it disconnects the Precorrector of Group Delay.

8.3.2 Sound Function

The Audio signal (balanced) enters from the audio connector (CM2) and it goes toward the operational amplifi er (U18B) LF353. This Amplifi er brings unbalanced audio signal. The output level is regulated by the electronic trimmer (U19) AD5242 piloted of the CPU. The operational circuits U18A, and U16A implement the preenphasy function. The circuit U16B drives the VCO (Q2) SST310, for to effect the modulation FM. This integrated in stereo confi guration accept in input audio signal of the stereo channel (S1), this with the purpose to effect the correct coding of the stereo signal.

The VCO constituted by Q2 and by the diodes VARICAP DV1, DV2, DV3, DV4, and of the Buffer Q3 is hooked through a PLL to the frequency video 38.9 MHz so that to center on the standard frequency 33.4 MHZs (system PAL B/G). In this way the difference between the carrying IF Video and IF Audio remains always

5.5MHZ. The operational amplifi er U13 realizes the fi lter PLL of the VCO. The output signal of the VCO (Q3) SST310 passes through a diodes attenuator pin D2,

D3 HSMP3814, and it is fi ltered and envoy to the connector 52x2. The attenuation of the audio signal is realized by the CPU through the electronic trimmer (U19)

AD5242. The relay K1 commanded by the CPU allows the insertion or the exclusion of the preenphasy.

The operational circuit U17A measures the deviation level, while U14B checks the state of “LOCK” PLL of the vco circuit.

8.3.3 Logic Function

In the Logic is present U9 EPM3164. It is a programmable logic that realizes all the necessary digital functions to effect: DC RESTORE, PLL SOUND and hookup of the VCTXO 38.9MHZ with the external 5 MHZ (if present).

8.3.4 Group Delay Function

The circuit GROUP DELAY is composed from N.° 6 circuits cells ALL PASS, whose resonance frequencies are opportunely been calculated for realizing the curve of group delay precorrection according to the various standards (PAL B/G, D/K etc.); the values in the scheme, are to the standard PAL B/G.In particularly U7 is an amplifi er that has been inserted after the fi rst group of 3 cells of delay with the purpose to adjust the output gain and equalizer the band.

26 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

8.3.5 PWS Function

The connector is brought with all the various signals, measures, commands and controls and power supply. Besides the regulators are present to stabilize the

+5VD, +5VD, +3.3VD, -5VA. The +15V is alone fi ltered.

8.4 Up converter board

Functional Description:

• Up-converting (frequency traslation) of IF Audio - Video carriers to UHF band

( ie: operative uhf channel).

• IF level input : 0 dBm typical – 50 Ohm

• Frequency synthetizer PLL Local Oscillator

• RF level output

• Internal LO Monitor

: 13 dBm typical – 50 Ohm

: 10dBm typical – 50 Ohm

• RF synthetizer PLL generator for local frequency source in up-convert process.

• Fine and coarse tuning function with internal high performance pll.

• Out-locking detector for inhibit RF amplifi er in no-locking condition.

• Internal high stability TXCO for very low drift frequency (long term stability).

• Very low phase noise VCO for high spectral purity (short term stability).

8.4.1 UP CONV Function

In the output it is present connector RF OUT MCX, the input signals IF IN and other Control Signals originate from connector DIN 52x2.

IF IN signal is fi ltered by LOW Pass Filter and envoy to the Mixer U11 ELCM-25MH that it effects the Up Converter using the signal LO IMP coming from the VCO. In the board the are present stadiums amplifi ers RF, U12 and U13, among which a diodes attenuator pin D2 has been inserted, D3 HSMP3814. The output of U13 goes toward the connector MCX (J5) and it represents RF Output. The output level is checked by the CPU through the CTRL-ALC signal.

8.4.2 VCO Function

The VCO is a component of purchase (U16) MW0512. The output goes to a divider

6dB, they output are respectively amplifi ed by U15 and U17 AG403-86. The circuit of PRE-SCALER, (setted to divides for 10), it allows the function of PLL.

User Manual Rev. 1.2 - 12/11/08

27 / 44

ATVST-CNV

8.4.3 Logic Function

The integrated circuit U6 EPM3064 is a programmable logic that realizes the functions of PLL for the hookup to the various frequencies of channel (UHF, VHF).

Its reference is an oscillator VTCXO 38.9MHZ that it can be hooked to the external

5MHz (if it present). The circuit U7B is the fi lter of the PLL.

8.4.4 Logic Function

The integrated circuit U1 AD9952 is a DDS (Direct Digital Sinthesis). It is a fractional digital divisor, it is as frequency generator of reference for hooking the PLL to the frequency of channel volute. The resolution of this integrated allows to effect the

Precision Offset in the case is present the reference external 5MHZ.

The frequencies produced by such component are equal to the frequency to the channel frequency to divide 10.

8.4.5 PWS Function

The connector is brought with all the various signals, measures, commands and controls and power supply. Besides the regulators are present to stabilize the

+3.3VD, +5VD, The other tensions are alone fi ltered.

8.5 RF amp unit

Functional Description

• Final RF Power Amplifi er is need for power amplifi cation of rf signal.

This unit give a gain of 30 dB over 470-860 (UHF vers.) / 170- 230 (VHF vers.)

Mhz broadcast band. Input and output impedance matching is very good for

Rf semiconductor are LD-mos transistor , with high gain, Low intermodulation distortion and low thermal resistance.They are ideal for ultralinearity application. The supply voltage is +32V with a current of 1,2 Amp in quiescent mode for Class A 5W e 300mA in quiescent mode for Class A/B 10W.

Two type of RF amplifi cation are available: 5W and 10W.

The performances for 5W module are:

• Power gain : +30dB

• Band frequency

• Power output

• IMD(-8,-10,-16)

: 470-860 (UHF vers.) / 170- 230 (VHF vers.) Mhz

: 5 W p-sync – 50 Ohm load

: -56dBc@2W p-sync (senza precorrettore)

28 / 44

Rf signal is connected to “input” pin of input hybrid coupler IB1. Two signal of identical amplitude ,but quadrature phase are connected to input matching network formed by microstrip line TL1-TL2 and C1-C2-C5. TL5 is a ¼ λ stub for matching

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

impedance and also connect Gate pin of TR1 to “ gate polarization circuit”,formed by IC1 and other passive components. In particular ,supply voltage (+28 Vcc) is fi ltered and reduced to 12V by IC1. then a resistor divider ,formed by R8,R5 and

Resistive trimmer R6 is used for select the quiescent drain current for LD-mos

TR1. This value is around 600mA.

Drain pin of TR1 is connected to output matching network.This is formed by microstrip line TL3,TL4 and capacitors C15-C16. TL4 is a ¼ λ stub for matching impedance and also connect Drain pin of TR1 to supply voltage (+28V) with a

Low Pass Filter formed by L1-C11-C12. Power resistor R10 is need for current sensing and for reduced Q factor of stub TL5.

The other RF path, formed by TR2 is identical ! The two quadrature signal are combined in output hybrid coupler IB2.The power signal is available to pin “out” of

IB2. In mismatching out situation, refl ected power go into inbalance power resistor

, connected to “load” pin of IB2.

The performances for 10W module are:

Power +30dB

• Band frequency

• Power output

• IMD(-8,-10,-16)

: 470-860 (UHF vers.) / 170- 230 (VHF vers.) Mhz

: 10 W p-sync – 50 Ohm load

: 54dBc@5W p-sync (senza precorrettore)

8.6 Power Supply Unit

Functional Description

• Switching power supply is a power conversion unit. High effi cency conversion device are used. Is full range with power supply from 90 to 230VAC.

Circuital confi guration is “non isolated” Forward- (Buck type)- Operative frequency of

70 KHz is used for reducing magnetic an capacitive loss in components .

Magnetic-loss in ferrite-core are low for used frequency and magnetic-fl ux sweep density.

Fast recovery diode are used for more effi cient conversion.

Monolithic IC are used.This switching regulator offer also thermal protection and overload protection. TO220 case of all regulator are mounted in

There is a monolithic temperature sensor for temperature monitoring of main heatsink.

Functional Description

• Directional coupler is used for measurement level of Direct

Power and Refl Power.

This information is send to CPU-Display unit, for easy readout of

Forward and Reflected power on LCD display. The directional coupler

User Manual Rev. 1.2 - 12/11/08

29 / 44

ATVST-CNV

is frequency equalizer over 470-860 (UHF vers.) / 170- 230 (VHF vers.)

Mhz broadcast band. Is directivity is more better than 20 dB and insertion loss on main line is more lower than 0.05 dB.

All the directional coupler is made with microstrip line technology, for very reliable application.

T h e r e i s a c o p l a n a r m i c r o s t r i p f o r a u x i l i a r y o u t p u t ( R F monitor), connected to bnc connector (50 Ohm impedance).

Coupling level for this monitor signal is around –50 dB.

The Rf input is sma connector (RF IN) and is the input of RF fi nal amplifi er.

The Rf output power signal is available to N connector (RF out).

As alternatives to precorrettor provided on the card when used ALC RF amplifi er from 10W.

It allows you to make a correction more effectively and achieve a level of intermodualzioni good over the whole frequency range.

By connecting internal 2 connectors excludes the precorrettore front integrated and include that with additional adjustments placed on the side of the modulator.

Standard

Precorrector

Figure 8.2

Optional

Precorrector

30 / 44

Figure 8.3

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

The function of precorrection is realized with the technique I and Q. The signal is divided into two components and distorted through diodes pin. At the end of the distortion process the I and Q components are summed and put out. The distortion type control is implemented by 12 trimmer seats on the side of equipment. These trimmers are organized into four cells, each one has three settings (Bias, Phase and Gain). Each cell works in a certain range of input signal, in particular one cell working on White level, one on Gray level and one on Black level, the fourth is used to perform a compression on the black level.

User Manual Rev. 1.2 - 12/11/08

31 / 44

ATVST-CNV

ATVST-CNV is made up of several modules connected through connectors to facilitate maintenance and replacement (if needed).

The fi gure below shows a top view of the equipment and component locations.

[2] 5/10W Amplifi er

[3] Filter

[6] IF Modulator Board

[7] Up Converter Board

Figure 9.1

32 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

10.1 Operation for the change of channel

10.1.1 Introduction

The procedure about change of channel must be performed by qualifi ed and experienced staff. Moreover, since some calibration must be executed, you must work within an equipped laboratory.

The operations to be performed can be summarised in the following three steps

• Set the new channel on the display.

• Adjust the reading power.

• Calibrate the pre-corrector.

The calibration of fi lter and the selection of channel must follow the table of frequencies in conformity with the standards in use. It is important, before you start, checking the standard of exciter; this is possible during the start-up operation after that the machine is switch-on.

10.1.2 Tools

• One calibrated wattmeter to measure 10Wps.

• One dummy load (20W).

• One video signal generator.

• Cables and various tools.

10.1.3 Procedure

1 Verify the standard of the exciter.

This is important to defi ne what table in the appendix must be taken into account.

User Manual Rev. 1.2 - 12/11/08

33 / 44

ATVST-CNV

2 Setup.

POWER

METER

BLUE VIDEO

VIDEO GENERATOR

(in according to the standard)

Spectrum Analyzer

3 Disabled the ALC function.

Enter into SETTING

⇒ ALC MODE ⇒ set MAN

4 Set the output power to 0.

POWER LEVEL

⇒ PUD MLC 0.0W

5 Switch-off the equipment, then remove the cover.

P/N T0981-11

C1 C2 C3 C4 C5 C6

P/N T0982-11

Filter of channel

P/N T0994-11

34 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

The calibration of this fi lter must be done setting the instrument with markers as indicated in tables of appendix (for details see chap. 10.3).

7 Switch-on the equipment and set the channel.

SETTING

⇒ CH SETTING ⇒ TX CHANNEL xx

OFFSET xx

8 S e t t h e o u t p u t p o w e r t o 1 0 % a n d c h e c k t h a t t h e s i g n a l present

POWER LEVEL

⇒ PUD MLC 0.0W

9 Adjust the reading power.

• Switch-off and switch-on holding down the encoder for 5 seconds.

• Set the output power to 10W.

POWER LEVEL

⇒ turn the encoder clockwise to increase the power.

• Select the INSTALLATION menu to make the calibration.

INSTALLATION

⇒ CALIBRATION ⇒ PUD ⇒ Set 10W.

• Select ESC to store the settings.

10 Enabled the ALC function.

Enter into SETTING

⇒ ALC MODE ⇒ set AUT

11 Before connecting the equipment to an amplifi er or to the antenna, you must adjust the output power to 0W.

Warning: before connecting the exciter with a system, check that the output power is set to 0W. The power level must be adjusted successively based on the amplifi cation system.

12 Calibrate the pre-corrector.

In any operation for the change of channel is necessary to adjust the precorrection to optimize the intermodulations.

10.2 Calibration for the fi lter of channel

Network analyzer

S21 S11

C1 C2 C3 C4 C5 C6

P/N T0982-11

OUT

Attenuator 10/20dB

Before connecting the fi lter with the instrument is necessary to perform the procedure of normalization to eliminate undesirable effects of cables. This consists of two points:

User Manual Rev. 1.2 - 12/11/08

35 / 44

ATVST-CNV

• Normalization of S11

• Normalization of S21

It is also need to set the instrument with the following setting:

• Central frequency, MK1, MK2, MK3 (for details see chap. 8.3).

• Span at 100MHz.

• S11 at 10dB/div.

• S21 at 10dB/div.

Input

Adapter

Tuning lines

Output

Adapter

Notch

Freq.

C1 C2 C3 C4 C5 C6

P/N T0982-11

Filter Channel (UHF Version)

Input

Adapter

Tuning line 1

Tuning coupler 1

Tuning line 2

Tuning coupler 2

Tuning line 3

Output

Adapter

Filter Channel (VHF Version)

36 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

PAL B,G CH46

Plot PAL B,G of Filter Channel (UHF Version)

User Manual

NTSC M CH45

Plot NTSC M of Filter Channel (UHF Version)

Rev. 1.2 - 12/11/08

37 / 44

ATVST-CNV

10.3 Tables

10.3.1 Standard M-NTSC UHF

655,25

663,25

671,25

679,25

687,25

695,25

703,25

711,25

719,25

583,25

591,25

599,25

607,25

615,25

623,25

631,25

639,25

647,25

video freq.

MK1

471,25

479,25

487,25

495,25

503,25

511,25

519,25

527,25

535,25

543,25

551,25

559,25

567,25

575,25

791,25

799,25

807,25

815,25

823,25

831,25

839,25

847,25

855,25

727,25

735,25

743,25

751,25

759,25

767,25

775,25

783,25

CHANNEL

mid freq

658,00

666,00

674,00

682,00

690,00

698,00

706,00

714,00

722,00

586,00

594,00

602,00

610,00

618,00

626,00

634,00

642,00

650,00

474,00

482,00

490,00

498,00

506,00

514,00

522,00

530,00

538,00

546,00

554,00

562,00

570,00

578,00

794,00

802,00

810,00

818,00

826,00

834,00

842,00

850,00

858,00

730,00

738,00

746,00

754,00

762,00

770,00

778,00

786,00

660,75

668,75

676,75

684,75

692,75

700,75

708,75

716,75

724,75

588,75

596,75

604,75

612,75

620,75

628,75

636,75

644,75

652,75

audio freq.

MK2

476,75

484,75

492,75

500,75

508,75

516,75

524,75

532,75

540,75

548,75

556,75

564,75

572,75

580,75

796,75

804,75

812,75

820,75

828,75

836,75

844,75

852,75

860,75

732,75

740,75

748,75

756,75

764,75

772,75

780,75

788,75

f. min

654,00

662,00

670,00

678,00

686,00

694,00

702,00

710,00

718,00

582,00

590,00

598,00

606,00

614,00

622,00

630,00

638,00

646,00

470,00

478,00

486,00

494,00

502,00

510,00

518,00

526,00

534,00

542,00

550,00

558,00

566,00

574,00

790,00

798,00

806,00

814,00

822,00

830,00

838,00

846,00

854,00

726,00

734,00

742,00

750,00

758,00

766,00

774,00

782,00

694,15

702,15

710,15

718,15

726,15

734,15

742,15

750,15

758,15

622,15

630,15

638,15

646,15

654,15

662,15

670,15

678,15

686,15

notch freq

MK3

510,15

518,15

526,15

534,15

542,15

550,15

558,15

566,15

574,15

582,15

590,15

598,15

606,15

614,15

830,15

838,15

846,15

854,15

862,15

870,15

878,15

886,15

894,15

766,15

774,15

782,15

790,15

798,15

806,15

814,15

822,15

f. max

662,00

670,00

678,00

686,00

694,00

702,00

710,00

718,00

726,00

590,00

598,00

606,00

614,00

622,00

630,00

638,00

646,00

654,00

478,00

486,00

494,00

502,00

510,00

518,00

526,00

534,00

542,00

550,00

558,00

566,00

574,00

582,00

798,00

806,00

814,00

822,00

830,00

838,00

846,00

854,00

862,00

734,00

742,00

750,00

758,00

766,00

774,00

782,00

790,00

38 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

10.3.2 Standard B,G PAL UHF

CHANNEL mid freq

767,00

773,00

779,00

785,00

791,00

797,00

803,00

809,00

815,00

821,00

827,00

833,00

839,00

713,00

719,00

725,00

731,00

737,00

743,00

749,00

755,00

761,00

665,00

671,00

677,00

683,00

689,00

695,00

701,00

707,00

611,00

617,00

623,00

629,00

635,00

641,00

647,00

653,00

659,00

557,00

563,00

569,00

575,00

581,00

587,00

593,00

599,00

605,00

473,00

479,00

485,00

491,00

497,00

503,00

509,00

515,00

521,00

527,00

533,00

539,00

545,00

551,00

765,25

771,25

777,25

783,25

789,25

795,25

801,25

807,25

813,25

819,25

825,25

831,25

837,25

711,25

717,25

723,25

729,25

735,25

741,25

747,25

753,25

759,25

663,25

669,25

675,25

681,25

687,25

693,25

699,25

705,25

609,25

615,25

621,25

627,25

633,25

639,25

645,25

651,25

657,25

555,25

561,25

567,25

573,25

579,25

585,25

591,25

597,25

603,25

video freq

MK1

471,25

477,25

483,25

489,25

495,25

501,25

507,25

513,25

519,25

525,25

531,25

537,25

543,25

549,25

769,75

775,75

781,75

787,75

793,75

799,75

805,75

811,75

817,75

823,75

829,75

835,75

841,75

715,75

721,75

727,75

733,75

739,75

745,75

751,75

757,75

763,75

667,75

673,75

679,75

685,75

691,75

697,75

703,75

709,75

613,75

619,75

625,75

631,75

637,75

643,75

649,75

655,75

661,75

559,75

565,75

571,75

577,75

583,75

589,75

595,75

601,75

607,75

audio freq

MK2

475,75

481,75

487,75

493,75

499,75

505,75

511,75

517,75

523,75

529,75

535,75

541,75

547,75

553,75

min. freq max freq

764,00

770,00

776,00

782,00

788,00

794,00

800,00

806,00

812,00

818,00

824,00

830,00

836,00

710,00

716,00

722,00

728,00

734,00

740,00

746,00

752,00

758,00

662,00

668,00

674,00

680,00

686,00

692,00

698,00

704,00

608,00

614,00

620,00

626,00

632,00

638,00

644,00

650,00

656,00

554,00

560,00

566,00

572,00

578,00

584,00

590,00

596,00

602,00

470,00

476,00

482,00

488,00

494,00

500,00

506,00

512,00

518,00

524,00

530,00

536,00

542,00

548,00

770,00

776,00

782,00

788,00

794,00

800,00

806,00

812,00

818,00

824,00

830,00

836,00

842,00

716,00

722,00

728,00

734,00

740,00

746,00

752,00

758,00

764,00

668,00

674,00

680,00

686,00

692,00

698,00

704,00

710,00

614,00

620,00

626,00

632,00

638,00

644,00

650,00

656,00

662,00

560,00

566,00

572,00

578,00

584,00

590,00

596,00

602,00

608,00

476,00

482,00

488,00

494,00

500,00

506,00

512,00

518,00

524,00

530,00

536,00

542,00

548,00

554,00

811,00

817,00

823,00

829,00

835,00

841,00

847,00

853,00

859,00

865,00

871,00

877,00

883,00

757,00

763,00

769,00

775,00

781,00

787,00

793,00

799,00

805,00

709,00

715,00

721,00

727,00

733,00

739,00

745,00

751,00

655,00

661,00

667,00

673,00

679,00

685,00

691,00

697,00

703,00

601,00

607,00

613,00

619,00

625,00

631,00

637,00

643,00

649,00

notch freq

MK3

517,00

523,00

529,00

535,00

541,00

547,00

553,00

559,00

565,00

571,00

577,00

583,00

589,00

595,00

User Manual Rev. 1.2 - 12/11/08

39 / 44

ATVST-CNV

845,00

851,00

857,00

863,00

869,00

875,00

881,00

887,00

843,25

849,25

855,25

861,25

867,25

873,25

879,25

885,25

847,75

853,75

859,75

865,75

871,75

877,75

883,75

889,75

889,00

895,00

901,00

907,00

913,00

919,00

925,00

931,00

842,00

848,00

854,00

860,00

866,00

872,00

878,00

884,00

10.3.3 Standard M-NTSC VHF

CHANNEL mid freq video freq.

audio freq.

notch freq.

f. min f. max

MK1 MK2 MK3

177,00

183,00

189,00

195,00

201,00

175,25

181,25

187,25

193,25

199,25

179,75

185,75

191,75

197,75

203,75

221,00

227,00

233,00

239,00

245,00

174,00 180,00

180,00 186,00

186,00 192,00

192,00 198,00

198,00 204,00

207,00

213,00

205,25

211,25

209,75

215,75

251,00

257,00

204,00 210,00

210,00 216,00

848,00

854,00

860,00

866,00

872,00

878,00

884,00

890,00

10.3.4 Standard B,G PAL VHF

CHANNEL mid freq video freq.

audio freq.

notch freq.

f. min f. max

177,50

184,50

191,50

198,50

205,50

212,50

219,50

226,50

MK1

175,25

182,25

189,25

196,25

203,25

210,25

217,25

224,25

MK2

180,75

187,75

194,75

201,75

208,75

215,75

222,75

229,75

MK3

214,15

221,15

228,15

235,15

242,15

249,15

256,15

263,15

174,00 181,00

181,00 188,00

188,00 195,00

195,00 202,00

202,00 209,00

209,00 216,00

216,00 223,00

223,00 230,00

40 / 44

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

11.1 Operation for the setting of pre-corrector

11.1.1 Introduction

The calibration of the pre-corrector must be performed by qualifi ed and experienced staff.

The ATVST-CNV can be supplied with two types of pre-correction card, they called respectively “standard pre-corrector” and “optional pre-corrector”.

11.1.2 Tools

• One spectrum analyzer.

• One dummy load.

• One video signal generator.

• Cables and various tools.

11.1.3 Procedure

1 Verify the type of pre-corrector installed.

Check on the right side of the equipment if are present 12 trimmer, this identifi ed that is installed the “optional pre-corrector”. Otherwise is installed the “standard pre-corrector”.

Satandard pre-corrector Optional pre-corrector

User Manual Rev. 1.2 - 12/11/08

41 / 44

ATVST-CNV

2 Setup.

Spectrum Analyzer

TV analyzer

Power

Amplifier

(optional)

RF IN

VIDEO GENERATOR

(in according to the standard)

RF IN

BLUE VIDEO

3 Enabled the ALC function.

Enter into SETTING

⇒ ALC MODE ⇒ set AUT

4 Enabled the ALC function.

Enter into PRECORRECTOR

⇒ set ON

5 Verify that the setted power is the same of working power.

6 Adjust the pre-corrector (see chap 11.1.3.1 or 11.1.3.2 based on the own pre-corrector).

11.1.3.1 Adjust “optional pre-correction”

This pre-corrector consists of 4 cells, each of which has 3 settings. Each cell acts on a specific video signal level, while the settings define the

The cells, from 1 to 3, introduce an expansion distortion, while the cell 4 introduces a compression distortion.

1 2 3 4

42 / 44

Each cell has three settings: bias, phase and level.

With the trimmers of bias and level is possible adjust the type of distorition, while with the trimmer of phase is possible to compensate for the phase.

Rev. 1.2 - 12/11/08 User Manual

ATVST-CNV

1 2 3

Bias

Phase

Level

For the cells 1, 2 and 3:

The adjustment of BIAS is nothing when the trimmer is fully rotated clockwise.

The adjustment of LEVEL is nothing when the trimmer is fully rotated counterclockwise.

The adjustment of PHASE is nothing when the trimmer is centrally located.

For the adjustment of each cell is recommended to operate as follows:

• With nothing BIAS and nothing PHASE enter the LEVEL slowly (turn the trimmer clockwise).

• Rotate the BIAS trimmer counter-clockwise up to see the fi rst effects.

• Adjust the PHASE.

For the cell 4:

The adjustment of BIAS is nothing when the trimmer is fully rotated clockwise.

The adjustment of LEVEL is nothing when the trimmer is fully rotated counter-clockwise.

The adjustment of PHASE is nothing when the trimmer is centrally located.

For the adjustment of this cell is recommended to operate as follows:

• With nothing BIAS and nothing PHASE completely turn the LEVEL trimmer clockwise.

• Rotate the BIAS trimmer counter-clockwise up to see the fi rst effects.

• Adjust the PHASE.

11.1.3.2 Adjust “standard pre-correction”

This pre-corrector consists of 3 cells, each of which has 3 settings. Each cell acts on a specific video signal level, while the settings define the

All the cells introduce an expansion distortion.

Bias

Phase

Level

User Manual Rev. 1.2 - 12/11/08

43 / 44

ATVST-CNV

For the cells 1, 2 and 3:

The adjustment of BIAS is nothing when the trimmer is fully rotated clockwise.

The adjustment of LEVEL is nothing when the trimmer is fully rotated clockwise.

The adjustment of PHASE is nothing when the trimmer is fully rotated counterclockwise.

For the adjustment of each cell is recommended to operate as follows:

• With nothing BIAS and nothing PHASE enter the LEVEL slowly (turn the trimmer counter-clockwise).

• Rotate the BIAS trimmer counter-clockwise up to see the fi rst effects.

• Adjust the PHASE.

44 / 44

Rev. 1.2 - 12/11/08 User Manual

Hello! I am an AI chatbot specifically trained to assist you with the R.V.R. Television ATVST-CNV TV Transmitter User Manual. I have thoroughly reviewed the document and can help you locate the exact information you need or explain the content in clear and simple terms. Whether you’re looking for guidance on specific features, troubleshooting steps, or general usage, feel free to ask your questions. The more details you provide about your concerns or needs, the more accurately and effectively I can assist you!

Show related prompts

Assistant typing

Assistant terminated

Key features

5W or 10W output power
Precorrector for improved signal quality
Synthesized oscillator with 25Hz step
Low noise
Low cost
Modular design
Forced air cooling
RS232 interface for remote control
LCD display for monitoring operation
Automatic level control (ALC)

Frequently asked questions

The ATVST-CNV has a selectable output power of 5W or 10W.

The ATVST-CNV features a standard precorrector with three slope controls on the front panel. Additionally, an optional precorrector is available to enhance performance at 10W.

The ATVST-CNV has an LCD display that shows operating channel, power output, reflected power, voltage supply, temperature, and video/sync levels. You can also use the RS232 interface for remote control and monitoring.