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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