There must be a Chip on the other side, to encode the signal for the receiver.That device is indeed a crystal, it appears to be for setting the local oscillator frequency for a CB receiver with a 455 KC IF (intermediate frequency). The brand is "NDK", a company that is still around. You may be able to recover a replacement from an old early 23 channel CB radio, but you may need to order one from a crystal company. That will cost about $10 if you are not in a rush.
From what I see of the circuit board it appears that it is a higher quality system, worth repairing. And it is probably a much better quality than anything made currently for the consumer market.
I think this is a good indication it twill work with 433 MHz:Sounds interresting. How do I know It will work with 433 mhz and how do I power it?
Still old technology and the old, un-encoded, 72Mhz was open to spurious opening from other sources.OK folks, connecting a circuit board receiver and a wall wart supply could possibly work, BUT the typical garage door opener installation would make that addition a pain. Replacing a broken crystal will allow using all of the original hardware mounted in it's original location with the same wiring and the same code. THAT lack of pain is sort of important. Even if the crystal cost a fair amount more it is the way to go, if the rest of that receiver is working.
OK, Max, but given the crystal frequency, 26.540, the transmitter is probably on the CB radio control channel "A". And we don't have much information on what part of the world the TS lives in. And some governments are not very patient with those who use unauthorized frequencies.Still old technology and the old, un-encoded, 72Mhz was open to spurious opening from other sources.
The old RC frequency!
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by Dale Wilson