[time-nuts] moon bounce for synchronization

Norm n3ykf normanlizeth at gmail.com
Sat Jan 30 19:47:25 UTC 2016


HP 5245M to be exact. There's one in my rack. Different plugin, same time
base. Still works at 5 GHz.

On Saturday, January 30, 2016, Jeremy Nichols <jn6wfo at gmail.com> wrote:

> Ooh! Ooh! Not only a 5245 with a 5265 voltmeter plug-in but a 5360
> Computing Pig! Great picture, thanks for posting it.
>
> Jeremy
> N6WFO
>
>
> On 1/30/2016 6:16 AM, jimlux wrote:
>
>> This month's historical picture from JPL
>> http://beacon.jpl.nasa.gov/historical-photo-of-the-month
>>
>> This atomic clock was used at the Goldstone Time Standards Laboratory in
>> 1970, to synchronize clocks at Deep Space Network stations around the
>> world. This master clock was accurate to plus or minus two millionths of a
>> second, when compared to clocks maintained by the National Bureau of
>> Standards and the U.S. Naval Observatory. In the late 1960s, JPL had
>> developed a moon bounce technique to transmit signals from one deep space
>> antenna to another. Experiments included periodic measurement of timing
>> signals that were reflected from the surface of the moon, to find out if
>> the station clocks were within allowable limits for accuracy.
>>
>> Time-nut will recognize, of course, that none of the things in that
>> picture are actually an atomic clock, although they are thing that are
>> useful if you have an atomic clock.
>>
>>
>> Note the sophisticated temperature monitoring system.
>>
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>
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