Well I dont know if it was used for that but the16kHz VLF station at Rugby
call-sign GBR was rebuilt in 1967 and the output tank circuit stiffened to
provide better phase stability specifically foe international time standard
comparison. The transmitter was used for initial comparisons between NPL and
NBS (later NIST) time standards. It was also the starting point for the
Omega nav system. Prior to that accurate time data was passed over twisted
pairs in UK and probably Europe.
Alan
G3NYK
----- Original Message -----
From: "Hal Murray" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Cc: <[email protected]>
Sent: Wednesday, October 14, 2015 6:12 AM
Subject: [time-nuts] How did they distribute time in the old days?
[email protected] said:
Somewhat time-nut related... the project main application needed
millisecond consistent (not necessarily accurate) time stamps on a
world-wide network. That was in the pre-gps, pre-fiber, pre-historic
before-times. I don't think that they ever quite got there.
World wide seismology took off in the early 1970s as background for
nuclear
underground non-testing treaties. Both the US and the USSR had to be sure
they could detect the opponents tests and distinguish tests from
earthquakes.
We had seismic stations scattered around the globe.
Does anybody know how they distributed time back then and/or how
accurately
they could do it?
Google says the speed of sound in rock is 6-8 km/s so 10 ms error would be
100 meters. That seems like a reasonable ballpark.
--
These are my opinions. I hate spam.
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