NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Todd Spath
Date: 2024 Feb 24, 04:53 -0800
I've been following the conversation re: the BBC pips and other broadcast band time signals. Attached for your listening pleasure is a sample of the shortwave time signal broadcast by CHU,Ottawa Ca on 3.330 MHz.This recording starts about 1/2 minute before the announced minute. After a few beeps (on the seconds) there is a period with digitally encoded information and then the beeps resume. The upcoming minute is then voiced in English and then in French, followed by the beep at the top of the minute, Every other minute the language order is alternated. This is an amplitude modulated signal (AM). The cool thing about AM is that it only takes one transistor to make a crude receiver (or just a diode if the signal is strong enough). The attached picture is a DIY single transistor regenerative receiver capable of receiving AM, CW, SSB. No data pipeline lag here!
https://en.wikipedia.org/wiki/CHU_(radio_station)
