Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!decvax!harpo!eagle!karn
From: karn@eagle.UUCP (Phil Karn)
Newsgroups: net.followup
Subject: Re: delays in phone propagation - (nf)
Message-ID: <1128@eagle.UUCP>
Date: Thu, 27-Oct-83 22:36:20 EST
Article-I.D.: eagle.1128
Posted: Thu Oct 27 22:36:20 1983
Date-Received: Mon, 31-Oct-83 04:04:54 EST
References: <2124@hp-pcd.UUCP>, <375@tekchips.UUCP> houxm.576
Lines: 19

The Heath clock uses an encoded subcarrier on WWV intended for just such
use.  It is a 1-per-second burst of 100 hz tone, the duration of which
encodes ones and zeroes.  You can hear this code if you have a receiver
with good bass response (or turn up the volume until the distortion
makes the harmonics audible.)  You will hear something like
"tickthummmmm....tickthum....tickthummmmm...." etc. The subcarrier is
continuous, even on the 29th and 59th seconds of each minute, but it is
most easily heard during the silent intervals without an audio tone.

This sequence gives the month, day, year and UT1 correction as well as
the hour, minute and second.  For details, get NBS Special Publication
432.  This is what you get when you write to the address given during
the half-hourly station ID.

The only modulation on station WWVB on 60 Khz is this code, although it
is in a slightly different format and the 1 hz sequence directly AMs the
carrier.

Phil