[Elecraft] Audio Improvements on a K2

[Don Wilhelm]

Robert and gang,

One thing in addition to the SSB Flattening Mod that helps for many K2s is
to remove C180 (the 10 pf cap in the 2nd xtal filter circuit).

I have not seen this mentioned much lately, but Wayne Burdick began
suggesting it as early as November 1999, and I saw it mentioned in a post
reporting information from Gary Surrency in mid-February this year. (I am
curious why it is still included - but then Wayne and Eric have been busy
with other things too!)

Note that after removing C180, L34 should be re-peaked.
Also if you install the SSB Flattening Mod and want to do some additional
'tweaking', one can experiment with the value of the 120 pf capacitor that
is added with the mod - I recall I ended up with something like 115 pf in my
K2, but then I just finished building a K2 for another ham and 120 pf worked
out really great so YMMV.

73,
Don Wilhelm  - Wake Forest, NC   W3FPR home page: http://www.qsl.net/w3fpr/
  QRP-L # 485   K2  SN 0020   mailto: w3fpr@arrl.net

*** Life is what happens when you're making other plans -- Mike Cross  ***

----- Original Message -----

> Thankyou to all who sent me e-mails on this topic.  I will certainly do
the
> filter 2nd mod.  I looked at it and the associated schematic.  Essentially
> doing a little switched in filtering.
>
>