Hi,
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
prone to
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: [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
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