On 6-Sep-2005, "three-eight-hotel" wrote:

So it appears as though I am transmitting fine (without side-tone
though), but I am receiving nothing. Sometimes everything will work
normally for 30-45 minutes before these symptoms start to appear. The
last few threads of the original post were leading me to believe that
this could be a COAX issue between the radio and the antenna... Does
this still seem like a possibility?

Unlikely. The same antenna is used for both transmit and receive, and would
have no effect on sidetone in any case.


The radio has been run up on a bench for 4-5 hours and supposedly,
everything is within specifications. (I also threw a working radio in
my plane and was able to encounter a failure with it). The antenna is
brand new and was replaced during this troubleshooting process.

Does anybody have an idea of what the issue is? I would really like to
have it narrowed down to one or two possibilities before I go back to
the mechanic and start taking things apart. My semi-shotgun approach
has already cost me a fair amount of money and I am no better off today
than I was when we started this process.

My first guess was a problem in the intercom, but since you bypassed it
without effect that eliminates that possibility.

Most likely, based upon your troubleshooting results, the audio output from
the radio is intermittent. However, since the same problem was observed
using another radio, this suggests two possibilities. One is the connector
in the radio mounting tray. The contact for audio output (which carries
both sidetone and receive audio) could be intermittent. The other
possibility (unless you have eliminated it in your troubleshooting, which is
quite likely) is that your headset is defective and that there is nothing
wrong with the radio.

First, eliminate the headset if you have not done so already. If it is OK,
I'd focus on the tray connector.

-Elliott Drucker



--
-Elliott Drucker