FYI, the six photos that Richard included with his Sulzer posting did not make it to the list.

I've attached them to this posting and we'll see if that works.

/tvb

----- Original Message -----
From: "Richard Mogford" rchrdm@earthlink.net
To: time-nuts@febo.com
Sent: Saturday, October 21, 2017 7:05 PM
Subject: [time-nuts] Sulzer 2.5 For Sale

Hello

I am selling a Sulzer 2.5 frequency standard.It is rack mounted with a
separate power supply and no battery.It also has an “Amplitude Fault
System.”(I have not been able to find out what this does.) There is a
PDF manual that I will send the buyer with the equipment.  The switch
setting #4 shows zero milliamps.

I am not an expert in these devices by any means, but have been running
the Sulzer for several days using John Miles’ excellent TimeLab
software.I have pasted in below an Allen Deviation plot for three days
of data collection.

I will be selling the Sulzer on auction on eBay starting on Monday,
October 23.The starting bid will be $200.Shipping may be around $50.

Please contact me if you have any questions.

Richard
AE6XO
rchrdm@earthlink.net

That system clearly is a rudimentary (simply based on amplitude)
failover controller---e.g., a shoestring setup could have an EOL
cesium standard (relatively-accurate but -unreliable) that's not on
UPS and a UPS-backed OCXO (like this unit) (relatively-inaccurate but
-reliable) connected to REF IN'' and STBY IN'', resp.  Honestly
this standard appears to be ancient and the high-level build quality
appears to be questionable.

-Ruslan

On Sat, Oct 21, 2017 at 10:05 PM, Richard Mogford rchrdm@earthlink.net wrote:

--
Ruslan Nabioullin
Wittgenstein Laboratories
rnabioullin@gmail.com
(508) 523-8535
50 Louise Dr.
Hollis, NH 03049

Hi Ruslan,

Yes. Sulzer oscillators are among of the best quartz frequency standards ever made. Good reading:

"Brief History of the Development of Ultra-precise Oscillators for Ground and Space Applications"
https://ieee-uffc.org/about-us/history/uffc-s-history/brief-history-of-the-development-of-ultra-precise-oscillators-for-ground-and-space-applications/

"Design and Performance of Ultraprecise 2.5-mc Quartz Crystal Units. (Warner, A.W.)"

http://ieee-uffc.org/wp-content/uploads/2016/11/warner.pdf
https://ieee-uffc.org/about-us/history/uffc-s-history/

The Sulzer 2.5C and 5B oscillators are highly sought after by time-nuts, given the history, the space-era construction inside, and (if you're lucky, or need a project) the amazing e-13 level of performance out of these standards:

https://febo.com/pages/oscillators/sulzer/
http://leapsecond.com/museum/sul25-1/

You don't need to read Japanese to appreciate this wonderful set of teardown photos:

http://etoysbox.jp/1_TestEquipment/12_F_std/OCXO/OCXO.htm

/tvb

----- Original Message -----
From: "Ruslan Nabioullin" rnabioullin@gmail.com
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Sunday, October 22, 2017 12:55 PM
Subject: Re: [time-nuts] Sulzer 2.5 For Sale

That system clearly is a rudimentary (simply based on amplitude)
failover controller---e.g., a shoestring setup could have an EOL
cesium standard (relatively-accurate but -unreliable) that's not on
UPS and a UPS-backed OCXO (like this unit) (relatively-inaccurate but
-reliable) connected to REF IN'' and STBY IN'', resp.  Honestly
this standard appears to be ancient and the high-level build quality
appears to be questionable.

-Ruslan

On Sat, Oct 21, 2017 at 10:05 PM, Richard Mogford rchrdm@earthlink.net wrote: