http://elecraft.85.s1.nabble.com/K3-To-zero-beat-or-not-to-zero-beat-tp7649117p7649135.html
> 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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