[time-nuts] Morion MV89A Repair
Bob Camp
lists at rtty.us
Mon Feb 27 12:35:05 UTC 2012
Hi
...or my lack of experience. I think I first saw problems like these in 1975. Somehow they keep showing up :)....
Bob
On Feb 27, 2012, at 5:44 AM, EWKehren at aol.com wrote:
> 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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