[Elecraft] K2 4 MHz reference oscillator calibration

[Ben Hofmann KB1AHR]

I need to calibrate the reference oscillator in my K2.
 Don't have any test equipment so I'll need to do it
against WWV at 10 MHZ using the N6KR method.

I'm a little confused as to how to zero beat the WWV
carrier as it instructs me to.  The instructions say
to zero beat the carrier precisely, or adjust the VFO
for best quality on a voice signal.  So, assuming
these are both happening at the same time (if they're
going to produce the same result) if I have the voice
tuned correctly (using USB or LSB mode), I can't hear
the carrier, so how can I zero beat it?  What am I
trying to zero beat the carrier against anyway?  Also
isn't the voice reception dependent on the BFO setting
of the filter?  My filter settings are not yet
optimized, I was planning on doing that after doing
the reference oscillator.  I'm confused about all
these points.

I've also read AB9GV's notes on W3FPR's web page, and
I think they just confused me even more.

Can anyone shed some light on this for me to make it a
little more clear?

Thanks.

-Ben  KB1AHR