[Elecraft] K2: BFO range problem on early S/N K2

[Allan Taylor]

Hi,

We are working on an older K2 (S/N 152) to fix apply some simple mods
and generally update things. After doing some straightforward mods
 (control board exclusively) we decided to touch up the filter/BFO
alignment as the perceived bandpass seemed to be tuned a bit low.
 It went very easily until we were working on the CW filter settings in
CW-REVERSE. There, anything we did refused to shift the bandpass
appropriately. We then did a BFO test from the manual. The desired range
is 3.5 kHz or higher, this rig came in at 2.83 kHz and is likely the source
of
our problem. Reading somewhat in the manual, a L33 is referred to. We
haven't
pursued that angle as yet. So... the big question for the K2 gang is this:

what is the most likely cause of a too-narrow BFO tuning range? I personally
suspect the BFO crystal(s), but what do I know.

For reference, I did not build this particular unit although I did build a
K2 of the
same S/N series back in 2000. This K2 has not been used much at all but
seems to work fine otherwise.  This K2 got a ride on three major raft trips
this
past summer (in a Pelican case!) but I doubt that is the source of the
problem.

Any ideas? Things to check??

-- 
73     Allan    K7GT