-----Original Message-----
I have light doubt that aroused yesterday night when I reached page 52 of
part II assembly. In the current manual to build S/N 4726 it instructs to
install 3 components on the bottom of the board (C91, RFC15 and C88). I
remember that when I build S/N 3279 there were only 2 components, C91 and
RFC15. As far as I understood from the information about the additions on
the hardware side, those were mainly related to the CW shaping envelope and
also the 2 diodes D40 and D41 to prevent RX overloading. I wonder if I
should have to add the 68pF capacitor C88 to the bottom side of the board on
my S/N 3279.
--------------------
These changes have to do with stability on 7182 kHz of the PLL. See page 5
of
http://www.elecraft.com/manual/k2a2binstr.pdf. C88 was added to improve
the stability, and is part of the A to B upgrade. You can add it to the old
K2 also, especially if you have gained access to 7.1-7.2 MHz in EA-land as
we have just been allowed to in LA-land.
73
Sverre
LA3ZA
http://www.qsl.net/la3za/
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