I wrote about this almost 10 years ago:
http://elecraft.365791.n2.nabble.com/Ref-Osc-Cal-Method-4-td2595451.html
Wes N7WS
On 2/22/2019 10:28 AM, Randy Farmer wrote:
A better method is to tune the receiver to the carrier frequency of the
highest WWV frequency you can hear. Then put the receiver in SSB mode and look
at the line out audio with a soundcard-based spectrum analyzer such as
Spectrum Lab (https://www.qsl.net/dl4yhf/spectra1.html). Check to see if the
500 Hz and 600 Hz tones are correct. If not, adjust the REF CAL to make them
right. Be sure to check on both USB and LSB; you may have to split the
(usually very small) difference between the two sideband responses.
73...
Randy, W8FN
On 2/22/2019 9:01 AM, Bob McGraw K4TAX wrote:
The method I've used to check my K3S, put the radio in CW mode, tune to each
WWV frequency and then press SPOT. The automatic SPOT function will bring
the radio to the WWV frequency +/- 1 Hz. The SPOT function matches the
receiver sidetone offset of the WWV carrier and the audio of WWV is not
applicable. If the display is other than the WWV frequency, then adjust
the REF CAL number to correct the error. You do need to check all of the
WWV frequencies you can receive to assure the accuracy holds on all bands.
Unfortunately we have come to believe that the digital readouts are absolute,
which indeed, they are not. They depend on the internal reference. If the
internal reference is incorrect, then everything else is likewise incorrect.
73
Bob, K4TAX
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