[Elecraft] KSB2-Filter Measurements

[Vic Rosenthal]

W3FPR - Don Wilhelm wrote:

> Comparing the K2 to any other rig outfitted with after-market filters is not
> really a fair comparison.  It does make me wonder how the K2 would do with
> similar after-market filters -- alas, those filters do not seem to exist.
> 
> With almost 5000 K2s out there now, I wonder if InRad is having second
> thoughts about providing filters for the K2 - it may require a non-SSB K2 to
> fit them in physically, and with the small market created by that simple
> fact, they may still not be interested. 

Actually, INRAD did make a prototype K2 CW filter -- 400 Hz with great shape 
factor.  I have one.  I first used a partial SSB board so that it could be 
switched in and out, but I could not get an acceptably low degree of blowby. 
Then I removed the SSB board and just hardwired the filter to the headers where 
the SSB board would go...still poor.  I tried lots of things with shielding and 
grounding but never succeeded in getting results as good as the standard CW 
filters with the KI6WX mod.

Just to be clear, this was NOT a problem with the filter, which looked great 
when tested stand-alone.  It had to do with interfacing it with the K2.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco