[time-nuts] Morion MV89A Repair
rbarrioss at msn.com
Mon Feb 27 10:16:23 UTC 2012
I wonder what the other oscillators that others are receiving look like in
the SA. Replacing all the capacitors would take a serious effort, not sure
if it would be justified.
Can I ask how can you know all that by looking at the spectrum plot?
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bob Camp
Sent: sábado, 25 de febrero de 2012 23:55
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 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
On Feb 25, 2012, at 4:01 PM, Roberto Barrios <rbarrioss at msn.com> wrote:
> Hi all,
> I spent this evening repairing a MV89A that had a weak output, output
> cap was bad:
> I also found while comparing with other two MV89A's that they show
> different output spectra, as can be seen. Test conditions were
> identical but one appears much cleaner than the others. What are the
reasons for this?
> Roberto EB4EQA
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