[K3] [Elecraft] It have to work better!

[Julius Fazekas n2wn]

Hi Alex,

What is the mod/problem found??

73,
Julius
n2wn


Alexander Ponomarenko-5 wrote:
> 
> 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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