Let's do a little more process of elimination.

You say you are keying the hand mic but speaking through the headset
mic. How do they hear you when you both key and speak through the hand
mic?

Does the com audio sound okay over the cabin speaker?

In other words, try taking your headset and all of that associated
circuitry out of the equation for a minute. If everything is A-Okay
using the hand mic and cabin speaker, then you know that the radios are
fine.

Next, try using the headset plugged directly into the mic and headphone
jacks, assuming those are accessible to you. You will not get a
sidetone (hear yourself talking on transmit), but you should be able to
do a radio check. You might have to borrow an external PTT switch to do
this. If this works okay, then you know your headset if fine.

At this point, the problem would be somewhat narrowed down to the
intercom, the audio panel, or the various connections between them (and
the PTT switches).

You can do at least this much for free. Then if you still have a
problem, you can reevaluate the situation as to if you want to spend
more money with the same radio guys.

Best regards,

Steve Robertson
N4732J 1967 Super III

--- In musketeermail@yahoogroups.com, "jm8995" <jm8995@y...> wrote:
> On both radios, ATC reports scratchy, distant and hard to hear
> transmissions. Both PTT are now in op. I use the mid console mic to
> key the transmission but do not speak through the mike, only my
> headset. I hear a constant feeback through my headset that changes
> witth power in flight. Is this a radio problem or an intercom, PTT
> and related problem.
>
> I hate to give these guys more money. Is there something that I can
> check first?
>
> Jeff




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