First let me thank Don (w3fpr) and Garry (ab7my) for their excellent support
and guidance for the resolution of this problem.
As posted earlier, I had a disappearance of my Tx SSB signal after
installing the adaptor to the K2 with normal RX and normal CW Tx. Had spent
some hours looking at the different boards without finding the culprit and
finally started chasing the SSB signal with the oscilloscope to see where it
was blocked.
That signal was going fine all the way past the crystal filter, exiting the
C5 cap after the T1 transformer but then could not be found at the cathode
of D14 !!!!
That's very strange indeed I thought, since the C5 is supposed to be
connected to the cathode of D14 ?!?!?
And here came the realization that I had done the STUPID mistake of
installing the D14 cathode 90deg away from its normal pad, to a similar pad
reserved for the R10.....Of course, at a later construction step I had
realized that one of the R10 pads was occupied, but I thought it was normal
and had soldered it there anyway (another stupidity).
Anyway, I can go on and on about how this should never had happened, but it
only took a 90deg rotation of this diode without even removing it from the
board to fix this.
Now I have full SSB output and are 1/2 way done with my K2 100W amplifier
board before I have everything up and running.
Already built the NB, AF filter and successfully passed the first alignment
test of the 100W board....
The above story is a good example of what happens when you stay up too many
hours building your K2. But as you know, when you start you can not easily
contain yourself from continuing building. It is addictive !!!
73 to all,
Marinos, ki4gin
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