On 2/22/11 9:47 AM, [email protected] wrote:
Thanks very much for the replies so far. I should have been more clear. I am
looking for the first radio controlled clock
that received a digital time code from a radio transmitter. Not a telegraphic
time code (those date back to around
1920), not a IRIG system, not a slave/master clock system (those date back to
the beginning of electric clocks), but
a digital time code broadcast by radio.
As far as I know, the first digital time code broadcast by radio was the 36-bit
NASA code on WWV which began in 1960.
By the definition above, the first true radio controlled clock I know of was
the Develco 3391 (around 1968 or 69). It
received the time code from WWVB on 60 kHz.
I'm pretty sure I saw some surplus WWV time code receivers with a
holdover capability in 1970,71 time frame as a kid. Is it a "clock"...
well, it counted in binary with neon bulbs. It was probably at least a
few years old when I saw it.
BTW - WWVB certainly wasn't ideal, but it was widely used by the power
industry in the pre-GPS days. It was also widely used to time seismic events.
Would be interested to know of anything earlier that meets the criteria of the
above definition. Would also be
interested in hearing from anyone who has seen or owns a Develco, and could
send a picture.
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