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I'm in the process of planning a UHF CB radio repeater. And I've heard there are ones around that transmit a voice message/warning on their input frequency (as well as standard output channel ident) to warn/nag people against using the input in simplex mode without knowing/caring.

  1. How would this be done, and how would your diplexer/cavity setup affect this?

  2. I'm guessing it would mean you are blocking your repeater input while this happens?

  3. Does this feature exist in commercial off the shelf products?

Marcus Müller
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Hayden Thring
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    Hello Hayden, and welcome to ham.stackexchange.com! – rclocher3 Nov 17 '20 at 00:21
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    For people in the US reading this question, the OP lives in Australia, where UHF CB is a thing, and where the rules are different than they are in the US. – rclocher3 Nov 17 '20 at 00:23
  • never seen or used a CB repeater, but I don't think it needs to receive on what you call its input frequency while it's transmitting that warning, so there's no need for a diplexer: just shut down your receiver for the time. – Marcus Müller Nov 17 '20 at 13:31

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