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Author Topic: Frequency Standard  (Read 313 times)

Offline briansalomon

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Frequency Standard
« on: 08-02-2019 -- 22:27:55 »
I need to replace an old HP 5061A Cesium frequency standard.

I'd like to maintain a the stability of that unit ( 7X10-12)

What are you using that you like?
Bring technical excellence with you when you walk in the door every day.

Offline silv3rstr3

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Re: Frequency Standard
« Reply #1 on: 08-05-2019 -- 23:19:59 »
I'm still utilizing the Datum 9390-6000 and it's still locking on to 6-8 SV's everyday!  Good manufacturing.  We recently bought the Fluke 910R to replace the Datum. Still waiting on the maintenance department to run the cable and replace the antenna with Fluke's.  I think the 910R meets the specifications you require. It's a GPS that can also be used as a stand alone Rubidium standard that's pretty accurate itself. 

I find it very interesting how the cesium atomic resonance occurs and how stable cesium 133 works with the atomic clock.  I saw a picture of an old atomic clock in a huge laboratory.  It was pretty massive. It's incredible that every GPS satellite in space presently contains four atomic clocks!!

I calibrate and repair a bunch of Spirent (GNSS) GPS Simulators here that peak at 1575.42MHz.  They actually simulate satellite constellations. These simulators cost around $600,000! It's crazy to me to be working on a piece of equipment that is worth a massive house depending on where you live!       
« Last Edit: 08-05-2019 -- 23:46:29 by silv3rstr3 »
“They are in front of us, behind us, and we are flanked on both sides by an enemy that out numbers us 29:1. They can’t get away from us now!!”
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Offline silv3rstr3

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Re: Frequency Standard
« Reply #2 on: 08-06-2019 -- 14:48:28 »
I checked out the specifications to see what I'm going to be working with in the near future.  Attached is a PDF file of just the specification page in the 910R datasheet.
“They are in front of us, behind us, and we are flanked on both sides by an enemy that out numbers us 29:1. They can’t get away from us now!!”
-Chesty Puller

Offline briansalomon

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Re: Frequency Standard
« Reply #3 on: 08-08-2019 -- 18:24:04 »
I'd love to have that 910R.

In case anyone's interested, here's a link to NIST. Helpful if you're used to relying on stand-alone frequency standards.

https://www.nist.gov/publications/use-gps-disciplined-oscillators-primary-frequency-standards-calibration-and-metrology

I rather have the Fluke but did find an EndRun Meridian II GPS time base that has some quality documentation with it. NIST did a comparison of this model to the USNO.

I have noticed that fairly low end (~ $1000) GPS frequency standards appear to be widely accepted.
Bring technical excellence with you when you walk in the door every day.

 

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