Paul,
It can sometimes be transmitted through tight clamping of units
in the system, but this does not sound like that symptom. If your headset
earcups 'leak' then the acoustic feedback would be the cause. Tight earcups
tend to reduce that.
Is your system operated as 'VOX' - voice-operated transmission?
That is, do you have the sound of your voice open the transmitter, or do you
press a transmitt button? If the former, the sound from nearby will trigger
the transmitter open as well as the intercom. VOX is operated by two datum
voltages - a large one which triggers the transmission and a smaller one
below which the transmitter shuts off. Both of these voltages is set by a
pair of potentiometers usually somewhere moderately available to the
avionics bod who installs/repairs same. The same may apply to the intercom
unit.
We'll keep an eye open for your solution when it comes.
Cheers, Ferg
----- Original Message -----
From: "Paul McAllister" <paul.mcallister@qia.net>
Subject: Europa-List: Feedback problem with the radio
<paul.mcallister@qia.net>
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| Hi All,
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| I have an odd problem with my GX60 when trying to transmit. I found it
would start oscillating, it would start with an echo and then break into
full audio feedback, similar to as what a PA system does when the microphone
is too close to the speaker. I fooled with the problem for the longest time
and I finally narrowed it down to my LightSpeed headsets. I called
LightSpeed and sure enough they knew about the problem. They invited me to
send the headsets back and they would fit a new shielded battery box. They
came back and they "sorta" worked, but unfortunately they would still do it.
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| A this point I resigned myself to using my Telex 3500's. These always
seemed to work, but today they started to exhibit the same problem... now I
am in a bit of a quandary on how to trouble shoot this problem. I do not
have an audio panel at this time, I am using the internal intercom in the
GX60.
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| Does anyone have any ideas where to head with this.
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| Paul
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