[ARC5] Zero Beat Question

[Robert Eleazer]

I have an embarrassingly simple question.  I understand how with a BFO in operation you can sometimes tune off to one side of an AM plus carrier signal and hear it without the whistle.  I recall listening with my Kenwood TS-820S once and hearing a guy running what I think was a T-195.  He even said that many people did not know he was transmitting straight AM rather than SSB.

But if you have a bunch of harmonics coming from a calibrator, say in 1 MHZ steps, how do you know you are on frequency, given that the whistle is 1 KHZ or so off?  And if you zero beat the signal and adjust the tuning pointer, how do you know if you are above or below the signal?

Thanks,

Wayne
WB5WSV      
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