Re: [time-nuts] Selling Time and Frequency Equipment Or "just saying"
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: To: 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Selling Time and Frequency Equipment
> To echo Attila, just sayin. $4000 is up there, but not outrageous IMO. If you have a $4000 budget and don't actually need a primary standard, a well-kept 5065A is a good way to go. At taus less than a few hours they can outperform the best 5071As, even before Corby's mod is applied. And they can be left powered on full time. You can't do any better for the same money, put it that way. 5065As with the optical-filter mod are more appropriately compared to passive H-masers than to cesium standards. -- john, KE5FX Miles Design LLC ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Selling Time and Frequency Equipment Or "just saying"
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, 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 > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Selling Time and Frequency Equipment
That is correct Sent from my iPhone > On Feb 24, 2018, at 12:20 PM, William H. Fite wrote: > > Had coffee with a realtor friend yesterday who was trying to explain to a > client: "It doesn't matter what you think it is worth. It doesn't matter > what you say it is worth. What matters is what a buyer will pay you for it. > The market, not the owner, decides the value of a piece of property. > > To echo Attila, just sayin. > > >> On Saturday, February 24, 2018, Attila Kinali wrote: >> >> On Sat, 24 Feb 2018 16:19:04 + >> MIKE ELDRIGE wrote: >> >>> The starting price is going to be $4000.00 not a penny less. >> >> https://www.ebay.com/itm/DATUM-Symmetricom-4040A-RS- >> 11696-501-Cesium-Frequency-Standard-Atomic-Clock/112784315644 >> >> https://www.ebay.com/itm/DATUM-Symmetricom-4040B-077-003-08832-129-Cesium- >> Frequency-Standard-Atomic-Clock/112745451687 >> >> >> Just saying... >> >>Attila Kinali >> >> >> -- >> The bad part of Zurich is where the degenerates >>throw DARK chocolate at you. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > -- > Patriotism is supporting your country all the time, and your government > when it deserves it. > --Mark Twain > > We may be surprised at the people we find in heaven. God has a soft spot > for sinners. His standards are quite low. > --Desmond Tutu > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Selling Time and Frequency Equipment
Had coffee with a realtor friend yesterday who was trying to explain to a client: "It doesn't matter what you think it is worth. It doesn't matter what you say it is worth. What matters is what a buyer will pay you for it. The market, not the owner, decides the value of a piece of property. To echo Attila, just sayin. On Saturday, February 24, 2018, Attila Kinali wrote: > On Sat, 24 Feb 2018 16:19:04 + > MIKE ELDRIGE wrote: > > > The starting price is going to be $4000.00 not a penny less. > > https://www.ebay.com/itm/DATUM-Symmetricom-4040A-RS- > 11696-501-Cesium-Frequency-Standard-Atomic-Clock/112784315644 > > https://www.ebay.com/itm/DATUM-Symmetricom-4040B-077-003-08832-129-Cesium- > Frequency-Standard-Atomic-Clock/112745451687 > > > Just saying... > > Attila Kinali > > > -- > The bad part of Zurich is where the degenerates > throw DARK chocolate at you. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- Patriotism is supporting your country all the time, and your government when it deserves it. --Mark Twain We may be surprised at the people we find in heaven. God has a soft spot for sinners. His standards are quite low. --Desmond Tutu ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Selling Time and Frequency Equipment
On Sat, 24 Feb 2018 16:19:04 + MIKE ELDRIGE wrote: > The starting price is going to be $4000.00 not a penny less. https://www.ebay.com/itm/DATUM-Symmetricom-4040A-RS-11696-501-Cesium-Frequency-Standard-Atomic-Clock/112784315644 https://www.ebay.com/itm/DATUM-Symmetricom-4040B-077-003-08832-129-Cesium-Frequency-Standard-Atomic-Clock/112745451687 Just saying... Attila Kinali -- The bad part of Zurich is where the degenerates throw DARK chocolate at you. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Selling Time and Frequency Equipment
TO ALL: FOR SALE HP 5065A late s/n 2816A01617. The unit has had the recommended caps replaced and is working great. I plan to send the unit to Corby for a plot and then it will be sold. The starting price is going to be $4000.00 not a penny less. Contact me off line from my e-mail below. I will be putting together a list of cesium standards that all work. I have GPS receivers, FTS 5065, FTS-5065B and others. Thanks, -- Mike, KG7AT mike.eldr...@msn.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
