[time-nuts] Morion MV89A Repair
namichie at gmail.com
Sun Feb 26 00:17:55 UTC 2012
I have two of Morion MV89A, one is prominently marked (RoHS 5).
I assume that means lead-less solder. Pure tin solder is much more
crystallised joints which break later.
Are these the dodgy units ?
cheers, Neville Michie
On 26/02/2012, at 11:02 AM, John Miles wrote:
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-
>> bounces at febo.com] 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
>> The spectrum you show in the middle is the correct one. It shows
>> the 10
>> 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
> locked to
>> the 5 MHz crystal oscillator. I suspect more than one capacitor
>> went bad
>> these OCXO's. Somebody may have sold Morion a bad reel of bypass
> Interesting. The MV89As are very stable, but they have a lot of AM
> 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
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