DB Elettronica Telecomunicazioni CTX 5 Manual de usuario

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

Pag. 1/86

CTX 5/10/20

5W/10W/20W

Analog TV Exciter

UHF Band

User’s Manual Release 1.2

DB ELETTRONICA TELECOMUNICAZIONI SpA

Riviera Maestri del Lavoro 20/1 – 35127 Padova

Ph. +39 049 8700588 – E-mail: sales@dbbroadcast.com

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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INDEX

1INTRODUCTION....................................................................................................................................................3

2TECHNICAL SPECIFICATIONS.........................................................................................................................7

2.1TECHNICAL FEATURES....................................................................................................................................... 7

3UNPACKING...........................................................................................................................................................9

4INSTALLATION AND SWITCHING ON PROCEDURE .................................................................................9

5MENU MAP...........................................................................................................................................................11

6FRONT PANEL MENU........................................................................................................................................15

6.2CONFIGURATIONS MENU .................................................................................................................................. 15

6.3STATUS MENU .................................................................................................................................................. 19

6.4SYSTEM MENU ................................................................................................................................................. 20

7FREQUENCY CHANGE......................................................................................................................................21

8AUDIO AND VIDEO MODULATOR BOARD .................................................................................................24

9PRECORRECTION AND UP CONVERTER BOARD ....................................................................................42

9.2FRONT PANEL TRIMMERS ................................................................................................................................. 43

10OSCILLATOR AND MIXER...............................................................................................................................60

115 WPS FINAL AMPLIFIER MODULE (DRIVER)...........................................................................................63

12DISPLAY MODULE.............................................................................................................................................72

13WEB MODULE.....................................................................................................................................................76

1410 MHZ REFERENCE OSCILLATOR..............................................................................................................78

15SWITCHING POWER SUPPLY BOARD (MODEL RS 150-24).....................................................................80

16AUXILIARY SWITCHING POWER SUPPLY BOARD NR 1 (MODEL 001-000070-00)............................82

17AUXILIARY SWITCHING POWER SUPPLY BOARD NR 2 (MODEL 0104-010) .....................................85

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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1INTRODUCTION

This new technology exciter has the function to modulate the video and audio signals referring to

the analog standard (PAL, NTSC or SECAM) and to convert the IF signal generated internally into

the RF signal at the transmission frequency.

The input video and audio signals are first of all modulated to generate the IF signal that is pre-

corrected by a 12 slopes precorrection board and converted into the RF signal.

The changing of the transmitted frequency is easily possible from the front panel working on the

unit directly by software commands that modify the PLL local oscillator settings. It is possible to

set whatever frequency inside the IV-V band only setting the desired channel using the front panel

buttons, with a precision of 1 Hz thanks to the high precision oscillator present on the up-converter

module.

It is also possible to have any locking to a 5MHz or 10 MHz external standard oscillator, in order to

obtain a high necessary stability ratio (precision offset). The standard setting is for a 10 MHz

external reference but it is possible to change the setting for accepting a 5MHz input as indicated in

the following paragraphs.

All the main parameters of the unit, including the data related to the audio and video input signals,

their processing and the output can be monitored in the front panel and also via WEB with a remote

control through web browser: an internal board allows the unit to be connected to a LAN using a RJ

45 interface in order to have access to all the functioning parameters of the unit and to send

commands working on a web page in a common web browser (Internet Explorer 6+) without the

installation of any special software.

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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Front View

CTX - TV EXCITER

WARNING

ALARM

MADE IN ITALY

BROADCAST

Rear View

FUSE 3.15T

115-230 Vac ENABLE

ADJ

50/60Hz

RFMON. RFOUT IF IN IF OUT

EXTFWD

RF REM

RFIN RFOUT

INPUT OUTPUT

OUT

VIDEO

LAN

RS485

CTRL OUT

FWD

DC OUT

REDUCTION

AUDIO 2 AUDIO 1

INPUT OUTPUT

10MHz

1. Front panel leds (ON, WARNING, ALARM)

2. LCD display

3. Front panel buttons (up, down, left, right, OK)

4. External access to the trimmers for the parameters adjustment

5. Mains plug

6. Fuse

7. RF Output N connector (5 W output from the RF amplifier stage)

8. IF Input (for an external IF signal)

9. IF Output (to give the IF internally generated to another equipment)

10. Audio 2 input/output connectors

11. Audio 1 input/output connectors

12. Video input/output connectors

13. LAN port (RJ 45 interface)

14. RS 485 port

15. CNTRL OUT port (it gives NC, NO and common contacts)

16. Enable connector (to enable the unit to function – to be connected to the control logic unit in case it is present

on the equipment)

17. 10 MHz external reference connectors (input and output)

18. RF OUT connector – output of the modulation board with 0 dBm level

19. RF IN connector – input of the RF amplifier stage @ 0 dBm in case of external modulation

20. RF REM REDUCTION connector – for the derating function in case of control logic unit present on the

equipment

21. EXT FWD connector – monitor FWD signal in case of external AGC

22. FWD DC OUT connector – DC voltage proportional to the RF output power of the CTX exciter

1 2

6 7 8 9 10 11 12 13

14151617181920212223

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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Internal top view

1. Web interface board (001-000092-00)

2. Audio/Video Modulator (0001-000109-00)

3. 2nd audio option

4. Final amplifier part

5. Switching Power supplies (RS 150-24)

6. Display board (001-000113-00)

7. Switching power supply board nr 1 (001-000070-00) for the generation of the +/- 15V, +5V

8. Switching power supply board nr 2 (0104-010) for the generation of +15V

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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Internal bottom view

9. Pre-correction and Up converter boards (001-000114-00)

10. External reference oscillator 5/10 MHz (001-000112-00)

11. Oscillator and Mixer (001-000081-00)

12. Band Pass filter

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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2TECHNICAL SPECIFICATIONS

2.1 Technical Features

•All analog TV standards available

•Very compact size, modular design: increases reliability and simplifies maintenance

operation.

•Common amplification sound and vision carriers.

•High performance linearity corrector.

•Very high MTBF.

•Full band coverage without adjustment.

•Synthesized local oscillator facility.

•Mono/Stereo/Dual sound version available.

Environmental data

Environment temperature operating range 0°C to +50 °C.

Maximum allowable relative humidity

95%

Power supply

165 ÷ 280 VAC, single phase

50/60 Hz ±2%

Power factor > 0.9

Input/output Connectors

Audio input (1) XLR-31, 600Ω

Video input (1) BNC, 75 Ω

Modulated RF output N, 50 Ω

Dimensions and weight

Standard 19” 2U – 482x500x90H mm –10kg

Operating frequency range UHF – Band IV & V (470-860MHz)

TV Standards B, G, D, K, M, N, I

Output power 5Wps (CTX 5/U), 10Wps (CTX 10/U), 20Wps (CTX 20/U)

1) Video Input 75 ohm – BNC

Input return loss > 35dB (0,25 ÷ 6MHz)

Video input level 1Vpp ± 6dB adjustable

DC restoration circuit at black porch

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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2) Video modulation parameters

Amplitude / frequency response ± 0,5dB (within the video band)

Differential gain at nominal power < 4%

Differential phase at nominal power < ± 2°

2TK factor < 1,5%

Group delay PV 0.75/5 MHz < ± 30nS (within the video band)

Sync pulse compression at nominal power < 3%

In-band intermodulation

(ref. to nominal power with 3 tones method Vc –5dB; Sc –10dB; Cc –17dB) < -60dB

Off-band spurious radiation < -60dB

S/N ratio (weighted) > 60dB

External reference frequency input 5 or 10MHz

Local oscillator stability (0 – 50 °C) < 2.5 ppm/year

(with optional high stability) < 0.5 ppm/year

L.O. frequency resolution 50kHz steps (standard version)

1Hz steps (with DDS precision offset option)

1) Audio Input XLR, two double inputs (stereo, A1, A2)

Input impedance 600 Ohm or 10 kOhm (balanced or unbalanced)

Input level 6dBm ± 6dB for ± 50kHz frequency deviation

2) Audio modulation characteristics

Modulation FM (F3) with maximum deviation ±50kHz

Pre-emphasis 50μs or 75μs

Amplitude / frequency response 30Hz ± 15kHz ± 0,5dB

Harmonic distortion < 0,1% (30Hz ÷ 15kHz by ± 50kHz deviation)

Intermodulation d2< 0,3%, d3 < 0,5% between 15kHz and

100kHz at ± 50kHz total deviation

S/N ratio > 65 dB

Separation between channels > 75 dB

Common mode rejection ratio of audio inputs (balanced mode) > 56 dB

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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3Unpacking

The equipment becomes the property of the customer when the equipment is delivered to the

carrier. Carefully unpack the transmitter. Perform a visual inspection to determine that no apparent

damage has been incurred during shipment. All shipping materials should be retained until it is

determined that the unit has not been damaged. Claims for damaged equipment must be promptly

filed with the carrier or the carrier may not accept the claim.

The contents of the shipment should be as indicated on the packing list. If the contents are

incomplete, or if the unit is damaged electrically or mechanically, notify both the carrier and DB

Elettronica.

4Installation and switching on procedure

CAUTION: Before turn the equipment on, ensure that all RF Loads, RF cables and connectors are

properly connected. To prevent damage to the amplifiers, it is essential that either the feeder and

antenna system or the dummy load have a good in band return loss.

Failure to observe the above caution and also the installation instructions of this amplifier may

cause damages to the amplifiers for which DB Elettronica cannot be considered responsible.

nPREVENTION OF ACCIDENTS

When it is used in normal applications and within the parameters defined in the technical

specifications, this equipment does not endanger health and safety, provided that normal operating

and engineering safety practices are observed and that it is used only by authorized, trained and

qualified personnel.

oTHERMIC AND ENVIRONMENTAL CONDITIONS

- A too high environmental temperature (in any case not higher than 45°C) shall cause a non-

adequate rack cooling putting the equipment in hard working conditions.

- An air conditioner should be installed to keep the room temperature constant even in case of

external temperature variation.

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.

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pSWITCHING ON PROCEDURE

•Connect an audio generator to the audio inputs of the unit with a 0 dBm signal of test;

•Connect a video generator on the video input of the unit with a black signal (0% field) as test

signal;

•Connect a dummy load of at least 50 W on the RF output of the unit in case the CTX is used

as stand alone, or connect a dummy load properly dimensioned at the total output of the

transmitter in case the CTX is a driver unit;

•Connect the CTX to the mains (220 VAC ± 10%, 50/60 Hz) and switch on it: the output

power level set in the factory is 0 W. Wait up the message STATUS OK appears on the

display;

•Set the unit to ALC mode (CONFIGURATIONS MENU -> OUTPUT OPTIONS -> AGC

MODE);

•Increase the output power up to the desired level (depending on the fact that the unit is used as

stand alone or as driver for a transmitter) setting the value in the menu CONFIGURATIONS

MENU -> OUTPUT OPTIONS -> RF OUTPUT (AGC);

•If you have at your disposal a signal demodulator, connect it to the RF MONITOR

connector (of the CTX unit if it works as stand alone otherwise the one of the transmitter)

and adjust the SYNC value up to have the 100% sync in the output of the unit;

•Adjust the Video level up to have 1Vpp;

•Adjust the deviation of the unit to optimize the transmission: normally it is factory set

depending on the standard (50 Hz for the PAL and SECAM standards, 25 Hz for the NTSC);

•Check the voltages on the page STATUS MENU -> VOLTAGE INFO and verify that all

the values are correct;

•The setting of the unit is complete: switch off the unit, disconnect the dummy load from the

output and connect the output to the antenna system. Disconnect the audio and video

generators and connect the signal that will be transmitted on-air. Switch on the unit again and

check that all the parameters are ok and the unit shows the message STATUS OK on the first

page of the menu.

NOTE: in case the frequency is not at the correct value, it is possible to adjust the value of the 10

MHz external reference using the trimmer on the rear panel up to have the right frequency value.

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