Bob,
Can you describe "noise burst" - is it more of a "tick", or if it is
longer, what is the approximate duration.
You will likely have to short the signal path at several points to
isolate it. One such point is the input to the product detector -
solder a jumper between pins 1 and 2 of T2. If it disappears, you will
have to look further toward the antenna - jumper from the base of Q3 to
ground (or between pins 3 and 4 of RP6).
OTOH, if it is still present with the jumper across T2, the next jumper
to install is between pins 2 and 3 of U3 (which should do the same as
when the K1 is muted).
73,
Don W3FPR
On 12/29/2015 12:35 PM, Bob wrote:
Thanks for the ideas, Mike!
Well I can rule out the Filter Board, as the noise is still there when the
Filter Board is removed.
I hoped I could remove the CPU to see if there was an issue there, but with
the CPU gone, the audio is eliminated (probably need to pull something high
or low to get the audio back).
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