VSB-70 Fast-Scan ]V Transceiver •• OperatIng Manual
FOREWORD Congratulations on your purcha~e of the VSB-70 Fast-Scan Television Transceiver. It will provide you with excellent quality live amateur television transmitting and receiving capabilities. ', To fully enjoy the benefits of the VSB-70, please read this manual carefully before operating the transceiver. If you have qu~stions, I 'encourage you to contact an AEA authorized dealer or one of our technical support representatives at: Advanced Electronic Applications, Inc. P.O. Box C2160, 2006-196th S1. S.
~ ·~,~;:,~~#?::~~;:t~~!~:·> , "i" •• '"" ", I~RdDU~TlON 1. INTRODUCTION The AEA model VSB-70 is a Fast-Scan Television (FSTV) transceiver that operates on the amateur 420 to 440 MHz band. The transmitter features two local oscillator crystaJ-controlled channels a'rid an output of one watt PEP on sync peaks. Receive operation can, transceive or use variable tuning. In transmit, baseband NTSC video and audio·are converted to Vestigial Sideband (VSB) video with the FM audio subcarrier in the 70 cm band.
r FRONT PANEL DESCRIPTION 2. FRONTPANELDESCRWTION _~ Advanced Electronic Applicalions. Inc. 0 00 ••• • - VIDEOGAIN XTAL D!j&)fI30{l@ 0 AUDIOGAIN Fastscan TV Transceiver RXTUNE- VFO Figure 1 Front panel controls, indicators and connectors are described below and illustrated in Figure 1: NAME .. control. the transceiver on the rear panel when transmittinq. 60 mA. mode when keyed. 12V F1/F2 crystals.
oter eceiver ::::~!l;,;t~~~':-J>': REAR PANEL DESCRIPTION 3. REAR PANEL DESCRIPTION • +-1> ' • RF AlTN ANTENNA POWER .' • •• , Model VSB-70 TV AUDIO IN . ••• VIDEO IN +13.6 VDC Advanced Electronic Applications, Inc. Figure 2 The VSB-70 rear panel connectors are listed below and illustrated in Figure 2: NAME . , -. db. occurs due to a 28 mast mounted the is adjustment reduced to about 16of gain turning RF gain ATTN is typically the adjustment db. fully CCW.
-~ ::..~ " ~ "...• "',:;". '! . .c ..•+:". INSTALLATION 4. INSTALLATION Unpack the VSB-70 carefully. Check for signs of damage. If any damage is noted, contact your dealer or the freight company. Keep any cartons and packing materials for the ~ealer's inspection. COrl~ider keeping the container and packing materials in case the unit must be shipped in the future. The VSB-70 is designed to transmit and receive in the 420 MHz to 440 MHz range. These instructions are for installation.
.... ;.'/~;~:}~~~/-' CHANNELSELECTION 5. •' .. t:,_:,;:,:~~,~ _ CHANNEL SELECTION VSB-70's are shipped with two local oscillator crystals installed. The crystals will provide operation at 434.00 MHz (F1) and 439.25 (F2) with channel 3 enabled for receiving and monitoring tra,nsmissions. You may be in a service area that requires selecting the other channel. If you have a local TV channel 3 or 4, choose the unused channel.
· TRANSMIT MODE OPERATION figured forThe other local oscillator crystals are purchased for optional TXlRX frequencies and TV channels. To install a crystal, complete the following: 1. Remove the power cord, then remove the top cover. 2. Use page 12 to locate the crystal socket (Y1 or Y2) and the corresponding ADJUST (F1. or F2) on the circuit bQ~rd.. 3. Install the new crYstal in th~ socket as desired. 4. Connect a video camera, Camcorder or VCR t~ the appropriate connector. 5.
8. Press RECEIVE/XM1T push-button switch to select transmit mode (latched In, red LED lights). 9. Begin transmitting. On your television receiver, check for video and audio signal quality and strength. 10. Adjust VIDEO GAIN AND AUDIO GAIN controls for signal quality and strength ... If you are using a Bird or equivalent power meter which ,reads average RF power, it will read 0.6 watts minimum with a black video source. This is the equivalent of one watt PEP on sync peaks. 7. RECEIVE MODE OPERA TION 1.
· ·~1.~~~~Bfg··' .~."'."", , ...""""._~,,: .":-;,"~':.1-.;~< , I .... TRANSMITTER SYSTEM DESCRIPTION DESCRIPTION Video and audio signals may be input from a video camera, Camcorder or VCR. Video and audio signals (baseband) from a video camera or Camcorder are input via a standard 1O-pin Canon connector on the front panel of the VSB70. Camera or VCR signals are input as separate video and. audio signals to the VIDEO IN and AUDIO IN jacks on the rear panel.
RECEIVER DESCRIPTION' RF signals present at the antenna connector on the rear panel are switched to the double tuned low-noise GaAsFET preamplifier. The preamplifier has been optimized for gain, thermal noise and image rejection. As a result, the receiver conversion noise figure is better than 1.5 dB in the 430 MHz band. The RF signal is then down-converted to a channel 3 or 4 IF by mixing with a user-selectable LO.
•:,"'~,;::.-',~~~.-.~:~. I ~. ~ " . ,,.. ,..~", .•..;..~ SYSTEM DESCRiPTION SYNC STRETCHER AND ZERO VIDEO GAIN SYNC ADJUSTMENTS Two internal controls adjust the sync signal characteristics. Adjusting R98 CCW (conter-clockwise) will increase the level of the synchronization pulse to compensate for compression of the signal in external amplifierS.
I •• l ~."'.~, f.i"·".' d;~~~;" ~,. ",,~~ .••. r•.,.. ,.J~~. ,;:', B""·1l., ~~~i" ~;l - 1:" ., •• Ii" .II "1 HIC " c;.l;-] - LJI •• e'" en ... 1~ ,,.,. .,. 41, ~'I' ,, p"". .... ,. "" hen Jlo-h , .. ...enf..~ 1";;.4 ~...~ <>- IZ.5V ~ e.~ --- * ~ll,0'''' AUtfIO
~•• ';'1.'1. ~d '.~:-t~.i. ;: ...• , f " ,r- PARTS PICTORIAL . r· 10. PARTS PICTORIAL Fl CRYSTAL Rl.
" "-':' ~';~I':' ;,.,. .•.. (.~ CAMERA. CAMCORDER or VCR ~, VESTIGIAL SIDE BAND FILTER ,.'.,' 6Z ItHZ 430 HIXEIl DIPLEXER DJPLEXER BAND PASS FILTER ~ •••• ~ ,'-~ .:':~"~'" \to CJ ·I:.~,: . .. ' ..;'. '.-.•. I~-·~·o-;c.; .... ~~.~;:~ : "' ~ \. ~( .cae ItHZ ~ ~~~~;' .- 31Z Q ; :-j'- '~-;,l 11HZ TO TELEVISION . ~~~ '5: ,,' , q3 ~ o RECEIVER 11HZ .....,J CO t • ,... ,... ::.,'!, . ~: - ... ' 01 I I" IDSCILLATOR~ COPYRIGHT BY AOVANCED ELECTRONIC APPLICATIONS.
, r" \ --, ..... 12. WARRANTY LIMITED WARRANTY ADVANCED ELECTRONIC APPLICATIONS, INC. warrants to the original purchaser that this product shall be free from defects in material or workmanship for ninety days from the date of original purchase. In order to obtain warranty service: 1) Complete and mail the warranty registration card within 10 days to Advanced Electronic Applications, Inc.
