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" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> 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 <[email protected]> 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 > [email protected] > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
