Well, it's not tuning to have the tone go to zero cycles, it's tuning to
have the BEAT between the two tones (from your vfo and his transmitter) go
to zero. Like tuning him in at a tome of 400 cycles, then adjusting your
VFO until it was 400 cycles, not 403 or 402, which makes a "wah-wah" sound
at 3 or 2 hz. Then you're "zero-beat."
My only qualification on this topic is that I was there when dirt was
invented.
-Rex-
K1HI - ex W1HWB, WA1YUK, W5PUG, K6RLX, KN6RLX
Rex Lint
Merrimack, NH
WWW.QRZ.COM/db/k1hi
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Scott Ellington
Sent: Tuesday, February 01, 2011 2:16 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] Zero beat
Not really, it's just the way we do it. Years ago, matching frequencies
meant literally listening for the zero-frequency beat. It was always
difficult, because the audio response of any receiver, as well as that of
the human ear, drops off at low frequencies. Now you can achieve the same
thing by matching the audio frequencies of the spot tone and the received
signal, both of which are within the audio response range of both the
receiver and our hearing. One can easily match frequencies within fraction
of a Hz with this method. This only works, however, because receivers now
have tracking sidetones, generated by exactly the same frequencies which
produce the received signal beat note.
73,
Scott K9MA
On Feb 1, 2011, at 1:03 PM, Ralph Parker wrote:
> Funny how 'zero beat' means something different today compared to years
ago.
Scott Ellington
Madison, Wisconsin
USA
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