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Tests with low power video transmitter circuits

Transmitting analogue video is not much more complex than transmitting AM or FM audio. All you need is a video source and an old TV to receive it. These videos show my experiments with various simple transmitter arrangements. None of my tests have so far included sound. That's a little more complex. But if you're curious simple TV transmitters that do include sound are on the web. Sound is basically wideband FM that is offset by a certain amount (here in Australia 5.5 MHz) from the video carrier.

These videos show my experiences with simple low power video transmitters on VHF frequencies.

Video transmitter with crystal oscillator modules

Crystal oscillator modules are an easy way to get VHF signals. You can often find them in old computers. Here I use one with a few extra parts to transmit video.


Video transmitter with a modified FM bug

Some countries used to transmit broadcast TV in the lower part of the VHF spectrum. As low as 45 MHz in the UK and Australia. Australia was unusual in that we also had TV in the middle VHF area (around 100 MHz) where most countries had their FM broadcast band. It took years for us to introduce FM broadcasting and clear this section of TV stations. But it does mean that old Australian TVs have channels (3, 4 & 5) in the FM range. This makes it easy, if you have an FM wireless microphone or 'bug', to modify it to transmit video. If you're in another country you will need to change the bug's frequency. This should be fairly easy in the Americas where an extra turn or two on the bug's coil will get you down into the TV channel 2 to 6 range below 88 MHz. Anyway enjoy this video on transmitting video with am FM bug.



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