Selling Time and Frequency Equipment Or "just saying"
First, full disclosure, I have no vested or financial interest in the
5065A he is selling.
Now the 2816A prefix is the last series built so the most modern.
The last one I remember on eBay went for OVER $4000.00
Comparing a 5065A to a Cesium (except maybe a working 5071A for the same
price)\is worse than Apples and Oranges.
Ask Bert who got rid of his 5065A years ago because he had a Cesium, he
regrets that now and just got a new one!
A 5065A buyer is looking for the best short term stability he can find
(nominal 1.5X10-13th at 100 Sec)
Keeping on frequency is easy via GPS comparisons.
A Cesium buyer want NIST traceable accuracy "out of the box" and never
(practically) having to adjust the frequency. The Cesium will be worse
when compared to the 5065A at shorter Tau even if it has a high
performance tube.
Another thing to consider when buying a Cesium is what is the condition
of the tube. The tube will die, just don't know when. (probably at the
most inconvenient time!), and lets not ask what a replacement tube costs!
There is no perceptible wear mechanisms in play for the 5065A (I have
seen exactly one failed lamp in many years of working on them) Many of
the first 1968 series built will still perform to specs today.
So,
Just saying!
Cheers,
Corby
Interesting, you have a data sheet and a picture of this wonder ?
73 de N1UL
Sent from my iPhone
On Feb 24, 2018, at 5:14 PM, cdelect@juno.com cdelect@juno.com wrote:
First, full disclosure, I have no vested or financial interest in the
5065A he is selling.
Now the 2816A prefix is the last series built so the most modern.
The last one I remember on eBay went for OVER $4000.00
Comparing a 5065A to a Cesium (except maybe a working 5071A for the same
price)\is worse than Apples and Oranges.
Ask Bert who got rid of his 5065A years ago because he had a Cesium, he
regrets that now and just got a new one!
A 5065A buyer is looking for the best short term stability he can find
(nominal 1.5X10-13th at 100 Sec)
Keeping on frequency is easy via GPS comparisons.
A Cesium buyer want NIST traceable accuracy "out of the box" and never
(practically) having to adjust the frequency. The Cesium will be worse
when compared to the 5065A at shorter Tau even if it has a high
performance tube.
Another thing to consider when buying a Cesium is what is the condition
of the tube. The tube will die, just don't know when. (probably at the
most inconvenient time!), and lets not ask what a replacement tube costs!
There is no perceptible wear mechanisms in play for the 5065A (I have
seen exactly one failed lamp in many years of working on them) Many of
the first 1968 series built will still perform to specs today.
So,
Just saying!
Cheers,
Corby
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Corby,
Thanks for your informative posting. I concur. Let me add a visual that echoes your comments. It's the same plot that I attached in the note about Ralph's lab. For those of you who can't view email attachments see [1].
The plot is ADEV of 4 typical lab frequency sources:
- A 5071A in Ralph's lab, on loan from NIST.
- A 5065A Ralph owns, which has some 120 Hz noise, but excellent stability beyond tau 1 s.
- The 10 MHz ref out of a Agilent/Keysight 53230A counter (XO or TCXO, not sure).
- The 10 MHz ref out of a SRS SG348 signal generator (OCXO option).
Note the difference between the 5065A and the 5071A in the plot. You can see why for many experiments a 5065A is preferred. I mean, over a wide range of tau it's 4x better. OTOH, if you want to make short-term measurements against a cesium standard, by all means turn off the Cs beam and let it free-run. Both the 5061A and 5071A make this easy.
/tvb
[1] http://leapsecond.com/tmp/2018b-Ralph-4-adev.png
----- Original Message -----
From: cdelect@juno.com
To: time-nuts@febo.com
Sent: Saturday, February 24, 2018 2:14 PM
Subject: [time-nuts] Selling Time and Frequency Equipment Or "just saying"
First, full disclosure, I have no vested or financial interest in the
5065A he is selling.
Now the 2816A prefix is the last series built so the most modern.
The last one I remember on eBay went for OVER $4000.00
Comparing a 5065A to a Cesium (except maybe a working 5071A for the same
price)\is worse than Apples and Oranges.
Ask Bert who got rid of his 5065A years ago because he had a Cesium, he
regrets that now and just got a new one!
A 5065A buyer is looking for the best short term stability he can find
(nominal 1.5X10-13th at 100 Sec)
Keeping on frequency is easy via GPS comparisons.
A Cesium buyer want NIST traceable accuracy "out of the box" and never
(practically) having to adjust the frequency. The Cesium will be worse
when compared to the 5065A at shorter Tau even if it has a high
performance tube.
Another thing to consider when buying a Cesium is what is the condition
of the tube. The tube will die, just don't know when. (probably at the
most inconvenient time!), and lets not ask what a replacement tube costs!
There is no perceptible wear mechanisms in play for the 5065A (I have
seen exactly one failed lamp in many years of working on them) Many of
the first 1968 series built will still perform to specs today.
So,
Just saying!
Cheers,
Corby
