On Mar 6, 2:10 am, Ron Wanttaja wrote:
Hmmmm. I was fiddling with an ICOM IC-A5 a while back. I found that when you
used the radio-mounted PTT switch, *both* microphones were live...the one in the
headset, and the one on the radio itself. With the external PTT switch, only
the headset microphone was live.

that's an interesting point, I didn't check that in my test, but
opening both mics would make it a lot harder to xmit cleanly. I will
give it a try when I get home, plus it looks trivial to make your own
external PTT switch so I'll try that too.