Corby has said more than once that it's not worth doing the "super 5065" optical filter mod to small telecon rubidiums, because they have too many other compromises in their designs. What about the SRS PRS-10? By some indications, it's the best current-production rubidium around. It doesn't have separate filter and resonance cells, but other than that it seems like a good design. And the time constants and such are digitally tunable. Is the PRS-10 worth trying the filter mod on? Cheers! --Stu

-------- In message <CAPXiX5p8u5ur=ZyxmcJhmvC5fJ5v8QvboffcQEO9kk_tWXwTiw@mail.gmail.com>, Stewart Cobb writes: >What about the SRS PRS-10? By some indications, it's the best >current-production rubidium around. It doesn't have separate filter and >resonance cells, but other than that it seems like a good design. And the >time constants and such are digitally tunable. Is the PRS-10 worth trying >the filter mod on? Apart from being able to fit the filter in mechanically, the only risk I see is that the microcontroller might know the correct ratio of "stray" light to "signal" light and get upset. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

I still stand by FRK, next to HP largest cell, Corby did it with a M 100 much more difficult. I started on a FRK but because of a macular hole in my left eye had to stop.First  test  should be to change time constant and monitor performance.Remember the outstanding performance  of the HP is do to the fact that the optical unit takes over somewhere around 0.1 seconds.FRK is well documented and easy to work on.We have pictures have to compress to attach to time nuts or contact me off list.Again if some one wants to take over please contact me directBert Kehren  Sent from my Galaxy Tab® A -------- Original message --------From: Poul-Henning Kamp <phk@phk.freebsd.dk> Date: 2/25/18 5:22 AM (GMT-05:00) To: Discussion of precise time and frequency measurement <time-nuts@febo.com>, Stewart Cobb <stewart.cobb@gmail.com> Subject: Re: [time-nuts] "Super Rubidium" filter mod for PRS-10? -------- In message <CAPXiX5p8u5ur=ZyxmcJhmvC5fJ5v8QvboffcQEO9kk_tWXwTiw@mail.gmail.com>, Stewart Cobb writes: >What about the SRS PRS-10? By some indications, it's the best >current-production rubidium around. It doesn't have separate filter and >resonance cells, but other than that it seems like a good design. And the >time constants and such are digitally tunable. Is the PRS-10 worth trying >the filter mod on? Apart from being able to fit the filter in mechanically, the only risk I see is that the microcontroller might know the correct ratio of "stray" light to "signal" light and get upset. -- Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG         | TCP/IP since RFC 956 FreeBSD committer       | BSD since 4.3-tahoe    Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ 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.