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.