[Elecraft] K2 w/KSB CW reverse BFO

[k6se@juno.com]

KD5NDB wrote:

"The first thing is to make sure the K2 is on frequency you can check
that by looking at WWV with Spectrogram looking for the 500 and 600 Hz
tones on alternating minutes (you may need to wait a little, the tones
are not on all minutes of the hour). Use USB or LSB mode. Set up a marker
at 500 and 600 Hertz on the Spectrogram display. When you have the tones
on the spectrogram markers, read the VFO frequency and write it down.
Connect the frequency probe to TP3 in  FCNTR mode and adjust C22 on the
control board to change the indicated frequency by the amount needed to
make the VFO correct."
==========
Although you can make the VFO frequency readout accurate (ignoring the
K2's temperature drift problem), I was told by Elecraft that if C22 on
the control board is not adjusted so that the 4.000 MHz oscillator is
exactly 4.000000 MHz that the K2's built-in frequency counter will not be
accurate, and that it should be adjusted that way and we should accept
any VFO frequency readout error which might occur as a result.  With the
4.000 MHz oscillator adjusted properly, the BFO frequency readouts will
be accurate when setting up the filters (as well as any other frequency
measurements done with the built-in frequency counter).

In fact, the #1 choice of setting C22 in the K2 manual is to set if for
exactly 4000.0000 kHz [and ignore any VFO frequency error].

73, de Earl, K6SE