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?
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk