[Elecraft] KPA100 Update

[Vic Rosenthal]

Roy Morris wrote:
> I have one of the older KPA100s and have done all the mods and
> upgrades.  However, I have seen a recommendation to change C80 and
> C81 from 4700 to 5600.   I have not seen these cap changes in the
> errata sheets.  My KPA100 works well on all bands, 160 thru 10
> (including 60 meters) with full output on all bands.  Are the new
> KPA100 kits supplying the 5600s or are these just changes if there is
> a problem with 15 and 17 meter low output?  

As I understand it, there is no reason to make this change if you do not 
have low output on 20/17 meters.

The gain of the KPA100 varies over the frequency range, and dips 
somewhere near the 30/20/17 meter bands.  On some KPA100s this dip is 
deep enough to make it hard for the driver to supply enough drive for 
full output.  There's been a lot of discussion about the exact cause of 
this dip, but according to Elecraft this change fixes a problem caused 
by capacitors that are at the low extreme of their tolerance range.

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