Hi for all K3-users,
Some weeks we searched for the reason of bad K3's sound and high level IMD.
We tried to replace resistors on the "line-out board". But it is
ineffectual.
Fortunately, Vlad UN7GZ has found out the problem.
Vlad has analysed the K3-scheme and has found some discrepancy on the
RF-board.
This problem in poor-quality assembly.
I also have made necessary corrections on my K3. The result are impressing!
Now I hear the sound is much more better (like my K2).
You can see all of these results:
here is plot BEFORE "modification" (you can see terrible "spur" near 12kHz)
http://forum.cqham.ru/download.php?id=32620
here is plots AFTER "modification":
http://forum.cqham.ru/download.php?id=32621
http://forum.cqham.ru/download.php?id=32651
http://forum.cqham.ru/download.php?id=32650
And of course you can read about it here in Russian:
http://forum.cqham.ru/viewtopic.php?t=17137
All these results is equal for ALL of K3-outs (both phones-outs and
line-out).
73!
Alex UR5LAM
RU-QRP-Club#0103
K3/100F #0568
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