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How to convert the TV in my boombox?
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N2IXK:
With a schematic, it should be relatively easy to find a point after the video detector to inject your composite signal.  A standard composite video signal is around 1 VPP into a 75 ohm load, with negative going sync pulses. You may need to invert or level shift your input signal to match the circuitry in the monitor.
optonox:
I should update this with:

There is no BNC connector input in this boom box.

The only video input option is "antenna in" which I am assuming is if I plug in one of those satellite dish looking antennas.

Is there any devices that take component video in and output an RF signal (transmit the RF signal, not over coax)?
james_s:
I wouldn't expect a BNC, they were only used on pro gear.

"Antenna" would have traditionally been a telescopic whip, a pair of "rabbit ears" or a rooftop Yagi, ie the classic outdoor TV antennal. Satellite dishes were rare in that era.

What you describe is called an RF modulator. Any RF modulator can transmit over the air if you connect it to a suitable antenna instead of using a direct cable from the modulator to the antenna jack. The professional ones are typically higher power but even a cheap one will work at close range. It's not going to be as powerful as a real TV transmitter but it's not legal to transmit at high power anyway. Look for brands like Holland or Blonder-Tongue, surplus professional broadcast gear.
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