[Elecraft] K2 Frequency Alignment

[Don Wilhelm]

Michael,

Turns out that I trust that method over most others.  In fact, that was what
I did on a K2 I was building when this discussion erupted - and my good
frequency counter was not functioning.
I used Spectrogram to show me the audio tone frequencies that WWV was
transmitting, judge the error and compensated accordingly.  All frequencies
that I could measure accurately were inside 20 Hz error - and that is about
the best one can expect with the DAC resolution provided by the K2.

All this discussion has made me think I might update my webpage
www.qsl.net/w3fpr with some of this information that has been flowing here
rapidly.  It will take a couple of weeks to wade through all the discussion
and come up with something understandable and reasonably concise, so please
be patient.  If anyone wants to contribute their favorite method to this
document, e-mail it to me privately (yes, I will give credit where credit is
due).  I will try to present a number of methods that one can chose from
depending on the equipment available.

73,
Don W3FPR

----- Original Message -----
I agree fully.  Another method involves measuring an unknown oscillator that
is at least stable.  Calibrate the K2, and check error against WWV and other
known standards.  Use the error to extimate exactly what the unknown must
have
been, and adjust C22 to display that frequency for the unknown oscillator.
Calibrate the K2, and check error against WWV again, repeat as needed.