Hi everyone!
I have been building SN 4078, and all has gone smoothly so far. The
radio is finished and works (except for the problem below) as do the SSB
and DSP options. I have been chasing one problem for a while however.
When I did the BFO test the BFO Low Freq came in as 4911.23 which is
ok. The high freq was only 4915.77, a bit short from the 4916.3 it is
supposed to be. I have replaced C173 and C174 with diffrent caps (same
value), confermed L33 is working properly and isn't shorted to
anything. I even removed it from its spot (kept it hooked up) and it
didn't make a sizeable change. The voltages at U11 pin six was 5.89 and
pin seven was 5.3 which are within tolerance. The DC voltages
everywhere else seem reasonable. The AC voltages anywhere I could
measure seemed reasonable. One intresting thing to note is the BFO
chrystals seem to be the wrong frequency. They are labled ECS V
4.9136-S Korea G3. This is diffrent then what the instruction manual
states they should be labled. The remaining chrystals on the board,
except the VFO, are ECS V 4.9136 -S Korea J3. A little diffrent labling
but same frequency. I have confirmed the rest of the chrystals on the
board are correct. I could be totally off track with the chrystal
idea... Can anyone confirm it or give me ideas as to what I might have
done wrong?
I love this radio, but when I transmit on the upper sideband it doesn't
suppress the carrier at all (lower sideband is fine). I believe this
problem is the result of the problem above since I couldn't set the USB
filters correctly.
Thanks
Craig
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