[Elecraft] K3- To zero beat or not to zero beat

[Wes]

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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