David,
Q14 is supposed to be a 2N4124, but you said you had a ZVN4424A from the
Q14 location. That would mean that you either received an extra
ZVN4424A in your kit or you found you were short when you got to the
installation of Q4 and ordered one from parts.
Normally the parts are picked correctly, so if you have one in the wrong
place, there is also another in the wrong place too - that is what I was
suspecting.
OK, back to your problem - from your description, it would appear that
the T/R switch is not properly isolating the receiver input. Check the
orientation of all the diodes against the parts placement diagram at the
back of the manual.
My assumption is that you are hearing the receiver signal (overloaded)
instead of the sidetone. At very low STL settings, the sidetone is not
very loud.
73,
Don W3FPR
On 3/20/2013 8:06 PM, David L DuPuy wrote:
Don, my apologies. That was a sloppy typo. It was Q14 I changed (not
Q4). Exactly where we thought the problem was, between MIX and BUF.
Sorry, my fault. Q4 is indeed a ZVN4424A. And Q14 is a 2N4124. David
AC4BN
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