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" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
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 <[email protected]> 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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