[time-nuts] Morion MV89A Repair

[Roberto Barrios]

Hi Bert,

I've googled for that and didn't find a related paper :-)

Regards,
Roberto EB4EQA

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of EWKehren at aol.com
Sent: lunes, 27 de febrero de 2012 11:44
To: time-nuts at febo.com
Subject: Re: [time-nuts] Morion MV89A Repair

Roberto
It is called tens of years of experience Bert Kehren
 
 
In a message dated 2/27/2012 5:16:28 A.M. Eastern Standard Time,
rbarrioss at msn.com writes:

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
> 
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