[time-nuts] moon bounce for synchronization

Dave Brown tractorb at ihug.co.nz
Sat Jan 30 17:26:35 EST 2016


The one in the rack is a 5245L actually. You need to blow the photo up to 
see. First thing I looked for as I wondered if they used the higher spec 
timebase model but the L timebase was probably driven from a separate 
external source. Still have two Ms and an L here- AND still looking for a 
couple of the 12 GHz plugins.
73
Dave
ZL3FJ


----- Original Message ----- 
From: "Norm n3ykf" <normanlizeth at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Sunday, January 31, 2016 8:47 AM
Subject: Re: [time-nuts] moon bounce for synchronization


> 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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