> -----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.
