Does an intercom interfer with this? If I shut my intercom off, I get no
sidetone. I've got an old Collins. That leads me to believe that the radio
is not providing any - whether blocked by the intercom or by design or
failure of the radio, I'm not sure. With the intercom on, I get sidetone
which I presume is being generated by the intercom.

When you use the handheld mic and speaker, clearly there shouldn't be any
feedback. I could believe that the headset output doesn't provide sidetone.
Why bother with the expense and extra parts?

--
-------------------------------
Travis
Lake N3094P
PWK
"mikem" wrote in message
oups.com...
On Apr 8, 3:20 pm, (Gary R.) wrote:
... is it a function of this early radio that it has no
sidetone---or a wiring problem?

I have flown older Cessnas that had the 300 series NavComs, and they
had sidetone.
Sidetone is generated inside the COM by sampling the audio from the
transmitter modulator
and routing it out through the "headphone" output pin, so you should
hear it when you transmit.
Either the radio has an internal problem, or possibly the "sidetone
level adjust" pot got turned down.
Most COMs have a "sidetone level adjustment", usually visible only
when the radio is out of its tray...