AC7AC:
>It's a mistake to think that a tone deaf person has any trouble zero
beating. It just isn't so. That's because the frequency of the tones is
immaterial.
>The "trick" is to know how to hear the beat note. One doesn't care what the
frequency of the signal is or whether it's any where near the sidetone note
frequency.
What you describe is very easy for continuous carriers,
but it's not as easy to hear beat notes when a CW signal is
rapidly pulsing on and off. With a continuous tones it is easy
to get to 0 Hz difference either audibly (listening for the beat
note) or visually (watching your S-meter pulsate). BTW jet planes
have an analog synchronization meter similar to the latter to
help the pilot synchronize RPM for multiple engines.
I agree it's somewhat of a myth that people cannot
match tones if they try. The test I referenced below asks
you to compare two sequential 500 Hz tones. This is analogous
to a CW note being one tone and pressing Spot being the second.
In over 11,000 test results, the average person was within 4 Hz
and only about 10% were as bad as 17 Hz off. 17 Hz is "close
enough" for even the tightest CW filters we normally use. Thus
I think zero beating is really a matter of concentration and
training your ear to listen for frequency differences.
73, Bill W4ZV
P.S. Test link:
http://tonometric.com/adaptivepitch/_______________________________________________
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