[time-nuts] fleabay cesium

[Glenn Little WB4UIV]

When I was serving in the US Navy we quit using Rubidium standards 
for Submarine radio and started using Cesium standards.
We also had a pair of Cesium standards that were used for timing in 
the navigation system.
I was told that the change was due to the Cesium had better long term 
stability than the Rubidium standard.
Every three months we calculated the drift rate for both of the 
navigation standards. We used LORAN for the reference.
Radio sent their standards to the submarine tender calibration lab to 
be calibrated.
The problem that we had with the Cesium standards was tube life.
The tube can be very expensive.

73
Glenn
WB4UIV



At 12:19 AM 5/9/2009, you wrote:
>OK, dumb question time.
>
>I have a few GPSDO's (Trimble T-Bolt, Z3801A, TrueTime & HB units).
>How much better can the Cesium be than any of those ??
>
>73, Dick, W1KSZ
>
>-----Original Message-----
> >From: ewkehren at aol.com
> >Sent: May 8, 2009 12:53 PM
> >To: time-nuts at febo.com
> >Subject: Re: [time-nuts] fleabay cesium
> >
> >The cesium is from the same source as the two HP 5062. A friend of 
> mine is selling them for me. I am in the process of cleaning house 
> and that is also where the FTS1200 came from. More things are to 
> come. I think this one is a later model because it has the newer 
> power supply board and the DC cesium oven controller. I think it is 
> the one unit. It should say in the description. I know I tested it, 
> also measured beam current with the LF test. It des not have the 
> two lights but during test they where installed and the pictures 
> are of the actual unit. If you want to know any thing else please 
> let me know.? Bert Kehren Miami
> >
> >
> >-----Original Message-----
> >From: Brian Kirby <kilodelta4foxmike at gmail.com>
> >To: precise time and frequency measurement <time-nuts at febo.com>
> >Sent: Fri, 8 May 2009 12:06 am
> >Subject: [time-nuts] fleabay cesium
> >
> >
> >seems to be a decent price cesium for sale ($600 starting HP5061A)?
> >?
> >http://cgi.ebay.com/HP-5061A-Cesium-Beam-Frequency-Standard-WORKING 
> _W0QQitemZ250415440530QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a4dec6292&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A4|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A200?
> >?
> >nobody has bid and 21 hours left...?
> >?
> >just a heads up - I know nothing about the unit or the dealer...?
> >?
> >Brian KD4FM?
> >?
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