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
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