Hi Bob: no. cobble, not double :-) A little research has me thinking I can easily adapt a morion. I can try it at least by starting with the morion on an external power supply and patching the output and control voltages in to the sr.
The sr620 has a control circuit which apparently accomplishes your suggestions; they claim to use the internal oscillator for short term and "lock" it to a supplied external source for longer term. Probably has a long time constant on the built-in phase lock to do this. Anyhow, autocal calibrates everything except, guess what, the 10 mhz source. Thats done separately. So a bootup self check shows OK even if the frequency standard is way off. Onward and upward. Don Bob Camp > Hi > > I believe that the SR620 uses a “true” 10 MHz OCXO. I would be careful using a > 5 MHz doubled to 10 OCXO. The counter may or may not be happy with > sub-harmonic induced jitter. > > Best bet at the specs: > > +12V power > 0-5V EFC > Sine wave out +7dbm > > +/- 5x10^-9 0 to 70C > > Pinout - trace what you have. > > Bob > >> On Nov 21, 2014, at 6:59 PM, Don Latham <d...@montana.com> wrote: >> >> >> So, I got a reasonable deal on a SR620 ho ho. Know your dealer. The ocxo is >> out of tolerance. All self tests pass with flying colors, autocal works as >> well. So the best parts are OK. >> Does anyone: >> 1) have a spare Isotemp OCXO36-53 10.000 MHz p/n 6-00051? >> 2) know the specs, ie the input voltage/current and the control voltage span >> and direction? pinout? >> I have some Morion mv-89's and could easily cobble one in if it will work. >> Apparently a correct oscillator must be in place to use an external source, >> if >> I read the manual right. >> >> 3) do we have a source for the schematics for the SR 620? >> >> The FTS 4060 is up, pumpin' and firmly locked. At least for now. That dealer >> was not lyin' >> >> Much thanks to all of you. >> The adventure continues >> >> >> -- >> "The power of accurate observation is commonly called cynicism by those who >> have not got it." >> -George Bernard Shaw >> >> Dr. Don Latham AJ7LL >> Six Mile Systems LLC >> 17850 Six Mile Road >> Huson, MT, 59846 >> mail: POBox 404 >> Frenchtown MT 59834-0404 >> VOX 406-626-4304 >> Skype: buffler2 >> www.lightningforensics.com >> www.sixmilesystems.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. > > _______________________________________________ > 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. > > -- "The power of accurate observation is commonly called cynicism by those who have not got it." -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road Huson, MT, 59846 mail: POBox 404 Frenchtown MT 59834-0404 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.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.