[ARC5] BC-221-WWV-sound card

[Glen Zook via ARC5]

If the receiver has an "S" meter, in the AM position, as you approach zero-beat, the meter will start vibrating.  The closer to the actual frequency the slower the vibration until it takes several seconds to go from one side of the scale to the other.  The longer the time this takes the closer to absolute zero-beat.
One can also use an oscilloscope hooked to the receiver audio to see the zero-beat. Glen, K9STH

Website: http://k9sth.net
      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: Bill Cromwell <wrcromwell at gmail.com>; ARC5 <arc5 at mailman.qth.net> 
 Sent: Thursday, March 5, 2015 11:47 AM
 Subject: Re: [ARC5] BC-221-WWV-sound card
   
Bill:

When it comes to zero-beating a crystal oscillator to WWV, I've always 
listened for the rise and fall in the band-noise when within a cycle (Hz) or two 
of exact zero-beat.

Using that method, I have always managed to get within some fraction of a 
cycle (Hz).

Your method, while very interesting, and very accurate, seems much too 
unnecessarily complex for me.