[Elecraft] K2 #61 XA to B in a day -- possible errata and manual comments

[Bill Acito W1PA]

Yep, took an XA through the full suite of updates...  lots of melted solder
and used solder wick on this past President's Day.

Anyways, things I noted on the trip (I did the full suite of mods):

1) UPGRADING THE ELECRAFT K2 to REV B (Ver E)
    Page 9 Left "Change C42 from .01 to 0.1" -- is C42 an added, back-of-the
    board cap on a XA Control Board? Couldn't find a C42 on the front.

    Page 9 Right "Locate RP5...create a tank with C33" --- on my control
board C33 is
    a maroon 103 or 102, and C32 is the 2.2uF that connects to pin 7 or 10
of RP5 --
    did the designators change on post XA boards, or did I find an error in
my
    original work?

2) IMPROVE TEMP STABILITY OF K2 (Ver H)

    L31 is removed and replaced as part of the X1, X2 removal...  but
immediately after,
    in  the PLL TEMP STABILITY mod, L31 is replaced again... there should be
a
    note in the BFO TEMP mod (page 3 left) to not re-install L31 if you are
also
    doing the PLL mod -- you'll do it there.
    The final, final version should be 12uH, correct?

    Also, same location, I assume the new X1 should be grounded (tie wire)
when installed?

3) K2 MODIFICATIONS FOR KPA100 USE (Ver A)

    The image on the back, lower right -- R18 is in a different location on
a XA board.


I'm not sure how many XA boards there were outside of the original 100 Field
testers, but I thought I would mention it.

Found the Transmit bandpass filter tuning much more sensitive than I
remember after the mods, but everything seems to be working.

Bill
W1PA  K2 #61