Schematics in KO4BB magnificent storehouse. Neil Schroeder > Did we answer the q? about schematics? > > All of SRS's products have their block diagram and parts list with a > detailed circuit description in their user manual. Sneak preview: its all > resistors. > > NS > > On Sun, Nov 23, 2014 at 4:22 PM, Don Latham <d...@montana.com> wrote: > >> No question about that. The morion does run a little warmer than the old >> unit >> apparently did. Fan is temp-controlled, so I think OK. will monitor box >> temp >> with a digital :-) thermometer, very poor resolution, but probably ok. >> When I get the last obs done. will do a little blurb to the group. >> Don >> >> Bob Camp >> > Hi >> > >> > That sounds fine. Without knowing just what they did or didn’t do, it’s >> always >> > worth being a bit careful. >> > >> > Bob >> > >> >> On Nov 23, 2014, at 6:40 PM, Don Latham <d...@montana.com> wrote: >> >> >> >> Running very nearly continuously for about 4 days now. The self-measured >> >> jitter is mean 0 and sdev of 8 ps. I don't think there is a problem >> with the >> >> Morion. I'm using my newly acquired cs source and a couple of z3801's >> for >> >> checking. 1 bit on the SR's frequency calibration dac seems to be about >> 4-5 >> >> parts in 10^-10 if I'm reading things right. Next test is a z3801 >> driving >> >> the >> >> external freq port on the sr to see if the frequency change direction >> of the >> >> morion is OK. >> >> The scope display output from the SR620 is great! >> >> Lots to learn. Also have one of Said's units coming. Gone nuts for time, >> >> won't >> >> do anything much new, but it's new to me. All this to drive >> moonbounce... >> >> Don >> >> >> >> >> >> Bob Camp >> >>> Hi >> >>> >> >>> If all the “good stuff” runs on the 90 MHz, the 5 MHz issue may not be >> >>> important at all. It’s just something to watch for. If you start seeing >> >>> data >> >>> in two groups, each one 20 ps wide and separated by maybe 200 ps, you >> are >> >>> seeing a problem from the 5 MHz. >> >>> >> >>> Running the box for a while before doing a full detailed cal is a very >> good >> >>> idea. It’s a bit warm inside and some of the stuff is temperature >> >>> sensitive. >> >>> You want it to reach equilibrium. >> >>> >> >>> Bob >> >>> >> >>>> On Nov 23, 2014, at 1:06 AM, Don Latham <d...@montana.com> wrote: >> >>>> >> >>>> Ah. Got it finally! Doh. Just finished trying out the Morion this >> >>>> afternoon. >> >>>> Electrically works very well. Used a 7812 to drop the +15 volts from >> the >> >>>> option 1 ocxo, there is enough power headroom to bring the Morion up >> from >> >>>> cold >> >>>> and run it comfortably. As you said, the control voltage for the >> original >> >>>> is >> >>>> indeed 5 v, and can be set by the internal d/a. The output of the >> >>>> oscillator >> >>>> passes through an emitter follower voltage adjuster and through a >> low-q >> >>>> filter >> >>>> to three stages of ECL buffer and then out to the 10 MHz system bus >> clock. >> >>>> Another path proceeds to a relay-switched divide by 2 to the phase >> >>>> detector >> >>>> so >> >>>> an external 5/10 MHz source can lock the internal oscillator. >> >>>> The external 5/10 MHz source proceeds to the phase detector thru an >> >>>> identical >> >>>> buffer chain without the switched divider. The remainder of the clock >> >>>> circuits is a multiplier to 90 MHz. >> >>>> >> >>>> I'll run the autocal tomorrow and then get some jitter stats if >> possible. >> >>>> This >> >>>> is an early specimen, s/n about 700 or so. I can imagine seldom used, >> and >> >>>> sitting on standby for 20 years or so, pushing the ocxo out of >> tolerance. >> >>>> >> >>>> The saga continues; I may have to look for a 10 MHz replacement on >> epay, >> >>>> there >> >>>> isn't room to put in an Hp, unfortunately. >> >>>> Don >> >>>> >> >>>> >> >>>> >> >>>> >> >>>> Bob Camp >> >>>>> Hi >> >>>>> >> >>>>> At least the Morion’s I have seen have 5 MHz crystals in them rather >> than >> >>>>> 10 >> >>>>> MHz. They have a 10 MHz output due to an internal doubler. Since the >> >>>>> circuit >> >>>>> is not perfect, there is cycle to cycle variation in the 10 MHz. >> It’s way >> >>>>> more >> >>>>> jitter (measured in picoseconds) than the oscillator has due to phase >> >>>>> noise. >> >>>>> My concern is that a counter might be bothered by this is some subtle >> >>>>> way. >> >>>>> >> >>>>> Bob >> >>>>> >> >>>>>> On Nov 22, 2014, at 3:55 PM, Don Latham <d...@montana.com> wrote: >> >>>>>> >> >>>>>> 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. >> >>>>> >> >>>>> _______________________________________________ >> >>>>> 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. >> >>> >> >>> _______________________________________________ >> >>> 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. >> > >> > _______________________________________________ >> > 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. >> > _______________________________________________ > 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.