I recently assembled a QDX rev 6, its the third QDX built, I have a
reasonable amount of building experience including multiple QRP labs
kits.
What I have not been able to resolve, I've researched online
troubleshooting and followed through, but it hasn't helped.
When I do the self test (verified using external signal generator
and not the self testing) my image rejection is non-existance varying
from band to band from between -6 to +10 db.
So far, inspected transformer T2, removed and verified the
windings. Finally with a new core T2 was re-wound an installed. The
A-A, B-B, C-C connections have repeatedly been checked, and that area
of the board gone over a couple of times with a jeweller's loupe for
poor solder or bridges, no fault found. Inputs and outputs of IC4 have
had a cursory check, same for the surface mount components, no obvious
fault found.
Next troubleshooting steps should be?
Thanks,
Ron VE8RT
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Ron VE8RT <ve8rt@...>
