Television Channel Modulator TVCM-2

Transcription

1 1 Television Channel Modulator TVCM-2 Contents CONTENTS...1 FRONTPANEL TVCM ACHTERPANEEL TVCM INTRODUCTION...4 FUNCTION OVERVIEW...5 DESCRIPTION OF MENUSTRUCTURE TVCM Home status display... 9 TET LABEL TV CHANNEL...9 SPECIFICATIONS TVCM AUDIOMODULATOR...11 AUDIO...11 IDENTIFICATION VIDEOMODULATOR RF UPCONVERTOR POWER SUPPLY GENERAL...13 Hulst The Netherlands, All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Hulst The Netherlands.

2 2 FRONTPANEL TVCM-2

3 3 BACKPANEL TVCM-2

4 4 Introduction This televisionmodulator was designed with in mind that no compromises should be made concerning electrical specifications. Combined with a large variety of connecting possibilities this modulator is very universal for a wide application area. The coverage of the whole band from 47 to 862 MHz keeps logistics at the operator s side easy. Just one piece of equipment wich does the job. Remote control is hardware prepared (RS485) and software dependent on what is used at buyers side. SNMP will be implemented in our remote controlled version.

5 5 Function overview The best impression is given by creating an overview of the user functions. standard option Aux. Video & audio input Auto detect main video absence 1) Automatic main -> aux or IF switchover When main video fail Aux IF input IF loop through Nicam stereo sound specify when ordering Audio ledbar monitoring L&R ch. Adjustable mod. Depth on front Adjustable pict/sound ratio on front Audio level adjust L&R on front RF outputlevel adjustable on front 20 db range error status led on front Master slave ref. frequency configuration for HRC concept specify when ordering 2 external inputs for forced aux / main switchover for aud.&vid. and IF Remote control hardware prepared RS 485 bus Remote control software contact us Whitelimiter specify when ordering LCD adjustment 1) if videodetect is false and main input is seleted automatic switchover to aux is performed for audio and video. If Aux in is choosen via the menu than the videodetect has no influence on this choice.

6 6 Description of menustructure TVCM-2 DISPLAY KEY COMMENT TVCM-2 REVISION.Y display after power-up during 3 seconds RF FREQ:,YYY MHz Alternating status line home display CONFIGURE <press key> announcement of configuration menu RF FREQUENCY :,YYY MHz increment/decrement frequency in 25 kc/s steps. autoscroll when key longer pressed RF OUT : ENABLE enable or disable RF output GAIN CONTROL : AGC toggles between AGC and MGC RF LEVEL CORR :,Y db Execute 0.5 db steps db/nom.

7 7 DISPLAY KEY COMMENT IF SOURCE : INTERNAL Toggles between internal and external IF input AUDIO MODE : STEREO toggles between mono dual stereo AV-SOURCE : MAIN toggles between main and aux AV source Second source: A /V aux toggles between A/V aux and IF aux LCD contrast increment/decrement contrast display < > Edit text? : no < > Edit text? : yes toggles between editing or not editing a text label CONFIG EIT <press key> end of menu returns to home display

8 8 Text Editor rev.0.6 2nd line? : Arrow Text Editor rev.0.6 2nd line? : Charset selecting way of charactersetting < > ^ < > «+>?ABCDEFGHIJKLMNO shifts through charactertabel and press to place character on first line Save text? : yes toggles between saving or not saving textlabel CONFIG EIT <press key> end of menu returns to home display

9 9 The home status display is showing the frequency permanent on the upper line While several parameters are alternately displayed at the lower line as shown below. Home status display RF FREQ:,YYY MHz STEREO A/V main Or: Main - aux input indicator for audio and video Stereo mono - dual indicator RF FREQ:,YYY MHz IF int AGC AGC MGC indicator Internal external IF source indicator Or: RF FREQ:,YYY MHz Text label TV channel

10 10 In the modulator several parameters are monitored, and if false, presented as the following alarmtext on the display. (This displaytext has the highest priority.) Display meaning ALARM no video input No video, or 1,2V<V in <0,7V pp (app.) is present On the video main input. ALARM RF output level The outputlevel deviates more than +/- 3 db /nom. Level. ALARM audiopll 33,1 unlock The audio PLL 33,1 MHz is out of lock ALARM audiopll 33,4 unlock The audio PLL 33,4 MHz is out of lock ALARM upconverter unlock One of the RF upconverter PLL s is not locked

11 SPECIFICATIONS TVCM AUDIOMODULATOR AUDIO Inputs Impedance Levels Level input range AF bandwidth AF flatness Preémphasis 5-P LR symmetrical MAIN and AU 600 Ω typ. +6dBm sym for 30kHz deviation -5dBm to +9dBm (adjustable on front) 40 15kHz better than ± 0.4dB 50µsec MODULATOR Carrierfrequency channel 1 IFout Carrierfrequency channel 2 Ifout picture/sound carrier ratio Modulation MHz (±200Hz) eqvt. to 352 Fh (Fh locked) MHz (±200Hz) eqvt. to Fh (Fh locked) channel 1: -13dB; channel 2: -20dB FM for both channels Soundmodulation Channel 1 Channel 2 Mono Mono Mono Stereo (L + R)/2=M Right Dual sound Left Right Deviation at 500Hz /+6dBm 600Ω input 30kHz 30kHz Distortion at 500Hz and 30kHz dev. < 0.2% < 0.2% Channel separation stereo 500Hz/30kHz dev.(with video) mono 500Hz/30kHz dev.(with video) dual 500Hz/30kHz dev.(with video) Signal to noise ratio stereo Identification Pilot carrier frequency Modulation Identification frequency Mono Stereo Dual sound Synchronisation 500Hz/30kHz dev khz (±5Hz), eqvt. to 3.5 Fh (Fh locked) AM 50% modulationdepth on channel 2Deviation of transmitter carrier 3kHz (on mono) None 117.5Hz eqvt. to Fh/ Hz eqvt. to Fh/57 pilot carrier and identification frequencies are phase-locked with horizontal frequency, Fh TVCM-2

12 12 2. VIDEOMODULATOR Video parameters measured with Tektronix VM700 +VITS201 and R&S EMFP on IF out. Video inputs main and AU Video impedance inputs TV standard Videolevel input IF frequency IF output IF output level IF output return loss IF impedance IF Loop-through and IF aux inputs IF inputs IF input level 2 x BNC asymmetrical 75Ω or 1800 Ω switchable on rear panel PAL B/G 1Vpp ± 60mV MHz (±200Hz) BNC 50Ω Typ.100dBµV peak sync. >20dB 50Ù asymmetrical output/inputs 2 x BNC 50Ω 100dBìV (±1dB) Modulationdepth 90% Videobandwidth Groupdelay 50Hz 5MHz ± 0.4dB better than ± 30nsec MHz Peak differential gain < 2% Peak differential phase < 2º Bar Tilt (rec 569) < 1% Luminance non lineairity < 3% 2T Pulse K-factor ± 1% S/N ratio weighted (rec 567) = > 68dB TVCM-2

13 13 3. RF UPCONVERTOR Output Impedance Output frequency range Stepsize max. output level (sync peak) Output level attenuator range Phase noise at f 10kHz Output returnloss Spectral purity Intermod. at 5.5MHz of RF carrier Noise out of channel BNC 75 Ω (50Ω / SMA or BNC on request) MHz 25kHz 117dBµV@75Ω ; typ. 20dB -88dBc/Hz >16dB >15dB > 65dB > MHz > dBµV out > dBµV out -78 dbc in 1 MHz refered to 117dBµV 4. POWER SUPPLY Input Mains voltage Power consumption Internal voltages 3-pole Eurodin socket 230Vac ±10% Hz 50VA 8/12/24 Volt Fuses primair: 500mAT secundair: 2AT (24V) 1A (8/12V) 5. GENERAL Operating ambient temperature Warm up time Dimensions Weight +5 to +45 C 15 minutes 1 height unit 19 x 47 cm deep 9.5 Kg TVCM-2