[Elecraft] Systematic error in spots as heard by K3

[Pete Smith N4ZR]

I agree, Rich - I had used the Elecraft calibration procedure with WWV 
to make sure it's dead zero-beat, when I first noticed this phenomenon.  
Done at 10 MHz before, this time at 15 MHz,  which seemed to be slightly 
different, so now we'll see how the spots sound.  Could be all it was - 
more precise calibration at the higher frequency.  I hope so.

Wish I didn't have such a tin ear hi.

73, Pete N4ZR
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On 7/28/2022 11:20 PM, Richard Ferch wrote:
> k3wyc said:
>
>> ... The spotted frequency should be the suppressed carrier frequency ...
> I don't think so. Most modern CW rigs that I am aware of, including the K3,
> display the actual transmitted frequency on the dial, not the SSB
> suppressed carrier frequency.
>
> That is why the spotted frequency should not depend on the choice of
> sidetone if the rig is tuned to the signal correctly. If the displayed
> frequency on the dial was the suppressed carrier frequency, then spotted
> frequencies would depend on the sidetone, but that is fortunately not the
> case with most modern radios. The microprocessor in the radio takes care of
> the offset calculation.
>
> If someone has a rig without adjustable sidetone and they prefer to listen
> to a different tone than their rig's sidetone, they need to be aware that
> when they listen this way they will be transmitting on a different
> frequency than the signal they are receiving, and also that frequencies
> they spot will be incorrect.
>
> If spots seem to be consistently to one side or the other of your sidetone,
> though, my first thought would be that there could be a frequency
> calibration error in your rig. An easy way to check would be to tune to the
> WWV carrier with the rig in CW mode. With the dial on exactly 10.000 MHz,
> the carrier tone you hear in the receiver should be the same as your
> sidetone. In SSB, on the other hand, the WWV carrier should not be audible
> (it should be at 0 Hz) with the dial on exactly 10.000 MHz.
>
> 73,
> Rich VE3KI
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