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Encrypted RF Signal?

I have a requirement for an rf transmitter/receiver setup where the receiver is to respond only if a certain code is transmitted or if the transmitted signal is encoded/encrypted in a manner that only a receiver with the matching circuit/hardware can receive it. I would appreciate it if you can direct me to resources/circuits/hardware that can address this requirement.

Thank you.
 

davenn

Moderator
I have a requirement for an rf transmitter/receiver setup where the receiver is to respond only if a certain code is transmitted or if the transmitted signal is encoded/encrypted in a manner that only a receiver with the matching circuit/hardware can receive it. I would appreciate it if you can direct me to resources/circuits/hardware that can address this requirement.

Thank you.


CTCSS is another very common method
 
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