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Fast Scan ATV Information - WA2FNQ
http://www.wa2fnq.com/atv/atvdoc.htm
Subcarrier audio - The most common method of transmitting sound is by a subcarrier. The output of the subcarrier generator, such as the PC-Electronics FMA5, is a 4.5 MHz signal, which is frequency modulated by the audio. Again, 75-microsecond pre-emphasis is used and the deviation is set to +- 25 kHz with the input level control.
The Design Of The Brookdale ATV Repeater System Exciter
https://www.qsl.net/kd2bd/exciter.html
The ATV exciter described here can transmit audio in a variety of ways including broadcast standard subcarrier audio, "on-carrier audio", or a combination of both methods. Subcarrier audio is produced by frequency modulating the TA451 operating at on the audio subcarrier frequency with a peak deviation +/- 25 kHz.
ATV W6ORG - ATV Emissions - Ham TV
http://www.hamtv.com/atvem.html
Because of the sound subcarrier being +/- 4.5 MHz on each side of the video carrier, only 2 channels are available for ATV in any given area without overlap and interference. For this reason, 439.25 or 434.0 are chosen for the high end of the band, and 427.25, 426.25 or 421.25 MHz for the low end of the band.
The Design Of The Brookdale ATV Repeater System Exciter
https://www.repeater-builder.com/hamtronics/atv-exciter/brookdale-atv-exciter.html
The ATV exciter described here can transmit audio in a variety of ways including broadcast standard sub-carrier audio, "on-carrier audio", or a combination of both methods. Sub-carrier audio is produced by frequency modulating the TA451 operating at on the audio sub-carrier frequency with a peak deviation ± 25 kHz.
Ham TV - Amateur Television
With ATV you can have full duplex audio - while one transmits and talks on the ATV sound subcarrier, everyone else can watch and listen on their cable ready TV set (cable ch 58, 59, 60) or TV with our downconverter, and at the same time talk back on a two meter FM voice frequency (better interaction and eliminates the long winded).
ATV LOW COST GUNNPLEXER ATV - w1npp.org
http://www.w1npp.org/events/2010/2010-F~1/ATV/GUNNPL~1.PDF
eras, camcorders, and VCR’s to be set for the 4 MHz NBFM ATV or 11MHz WBFM ATV standards. The FMA5 sound subcarrier boards also have variable deviation (50 kHz is standard for FM ATV) pot as well as injection to the modulator (-10 dB is standard). To receive you can use another Gunnplexer and off set 70 MHz and use a surplus satellite TV receiver
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