I work in the Land Mobile Radio field. FCC licensed etc. PTT is required
for the LMR comm's. VOX might work if audio is buffered.

RST Engineering wrote:

You don't need PTT for ANY intercom function; you only need it when you need
to turn on the COM transmitter. You an airplane sparky?

Jim




--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P