More time synchronization signal information (links)

[ADB]

Normdiaz has posted below a link to a page that provides information about the range of the atomic time signals available worldwide. Here are links that provide information about the time signals formats.

US time signal format
Here is a link to an interesting web page that provides some details about the time signal format for the US (Colorado) atomic time signal.
http://www.ntp-time-server.com/atomic-clock.htm
Summarising, the actual time information is encoded in 53 bits + 7 separators, and one bit/separator is transmitted per second, so it takes a minimum of 1 minute for an RC watch to get the time data.
The Colorado radio transmitter is AM (Amplitude Modulated).

German time signal format
Information can be found here:
http://www.captain.at/howto-dcf77-time-code.php
and here:
http://ezinearticles.com/?Decoding-the-DCF-77-Radio-Time-Signal&id=424094

Japan time signal format
Official information here:
http://jjy.nict.go.jp/jjy/trans/index-e.html

The three time signals are very similar in encoding and all three are relatively simple, so software to decode them can be written quite easily for any low power microprocessor.
Cheers,