"John Woodgate" wrote in message
...
I read in sci.electronics.design that Tim Shoppa
wrote (in
.com) about 'wwvb
receiver chip needed', on Tue, 26 Apr 2005:

Zero-beat to WWV is hard to do better than 50Hz by ear.

Have you tried a Lissajou display?
--

Or use the S-meter to see very low freq beats.