"Jason Wagner" wrote in message ...
Found US Border Patrol tonight. I can only hear one side of the
conversation. Is this because they are on a trunked system, or because they
transmit and receive on different frequencies?

Thanks.

or they were talking on the same frequency but only one of the guys
was close enough for you to hear. the other person could have been
much farther away.

Its also much easier to hear someone far away in an aircraft than the
ground station he is talking to.