[time-nuts] moon bounce for synchronization

Jeremy Nichols jn6wfo at gmail.com
Sat Jan 30 16:19:44 EST 2016


If you look closely at the picture, you'll see that it's an "L," but 
there isn't quite enough resolution to say whether it's a 5245L or a 
5248L. Probably 5245L because most 5248s had the hi-accuracy (for the 
era!) standard and were sold as 5248M.

Jeremy


On 1/30/2016 11:47 AM, Norm n3ykf wrote:
> 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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