Hi Are the specs at 5 MHz or at 10? They should be 6 db worse at 10 than at 5.
Bob On Feb 25, 2012, at 7:02 PM, "John Miles" <[email protected]> wrote: > >> -----Original Message----- >> From: [email protected] [mailto:time-nuts- >> [email protected]] On Behalf Of Bob Camp >> Sent: Saturday, February 25, 2012 2:55 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Morion MV89A Repair >> >> Hi >> >> The spectrum you show in the middle is the correct one. It shows the 10 > MHz >> output and the sub-harmonics related to the 5 MHz crystal oscillator. The >> other two are a bit broken. One appears to have a stage oscillating. The >> other is more interesting. It has a stage oscillating that is injection > locked to >> the 5 MHz crystal oscillator. I suspect more than one capacitor went bad > in >> these OCXO's. Somebody may have sold Morion a bad reel of bypass caps. >> >> Bob > > Interesting. The MV89As are very stable, but they have a lot of AM noise > and they don't meet their PN specs (about -150 dBc/Hz at 10 kHz rather than > -155). I've tested a few and they all look the same in that respect. > Sounds like replacing all of the SMT caps may be a good move. > > -- john > > > _______________________________________________ > 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. _______________________________________________ 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.
