[time-nuts] Morion MV89A Repair

Roberto Barrios rbarrioss at msn.com
Mon Feb 27 10:16:23 UTC 2012


Hi Bob,

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?

Thank you,
Roberto EB4EQA

-----Original Message-----
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

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



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:
> 
> 
> 
> http://www.rbarrios.com/projects/MV89A
> 
> 
> 
> 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?
> 
> 
> 
> Regards,
> 
> Roberto EB4EQA
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

_______________________________________________
time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




More information about the time-nuts mailing list