[time-nuts] Sulzer 2.5 For Sale

[Tom Van Baak]

Hi Ruslan,

> this standard appears to be ancient 

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 at gmail.com>
To: "Discussion of precise time and frequency measurement" <time-nuts at 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 at earthlink.net> wrote:
> 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 at earthlink.net
>