On 6 Mar 2006 22:08:15 -0800, "JonnyBNB" wrote in
.com:

My brother in law and I were tuning a new antenna for his Cobra 18 WX
ST and when we got the SWR as low as we could, tried it out. As he got
further away during a test run I encouraged him to speak up because he
wasn't getting decent modulation.


Are you sure the problem was lack of modulation and not lack of
carrier signal strength?


When he did the result was pulsating
oscillations that obscured his audio.


Motorboating? Sounds like it might be a power supply deficiency.


I'm an audio guy, but I mix rock concerts. The type of squealing I
usually deal with is some jerk guitar player wanting 130 dB SPL from
his monitor wedges. There's not any possibility for audio feedback in
this case, my rig was two miles away from his and he doesn't have
talkback.


I don't get too much monitor feedback, but then I work smaller rooms.
When someone cranks their monitor it usually messes up the room's EQ
and I have to dial in a compromise between the monitor and the PA.


At any rate, the question is, would replacing the audio amp chip do the
trick, is the part readily available, and is it anything a guy with
plenty of soldering experience couldn't tackle.


A new audio amp probably won't change anything. Check your power
supply. You should be getting a steady 13.6 - 14 volts to the radio
and it shouldn't change under full modulation. If the signal is weak,
make sure your antenna is installed properly (good grounds & cable).
Get a bigger antenna if necessary.







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