First, I said (in part):

...

"If you're not using full duplex, you blindly keep transmitting and creating interference for the rest of the users."

Then skriostof@... said (in part):

Not OK. If you're not using full duplex, you LISTEN to see if someone

answers your call. It is possible to successfully operate without

full-duplex.

Not quite. Repeating my situation of three people making a call after the previous conversation ends.

You are operating full duplex: You start transmitting, and hear a hetrodyne, and stop transmitting within a second. Another person successfully makes a call because the hetrodyne ends.

You are not operating fulll duplex: You start transmitting and speak the callsign of the person you are calling followed by your own callsign before you unkey. No one is heard because of the hetrodyne.

Jim Walls K6CCC