[time-nuts] CS reservoir depletion

[EB4APL]

Thank you Bob,

I think I'll get it, just to have another quality oscillator.  About its 
aging I think it is new, probably a spare unit. since there are not 
signs of any solder on the pins.

Best regards,
Ignacio

El 14/01/2011 18:11, Bob Camp escribió:
> Hi
>
> The 105 oscillator is a nice OCXO. I certainly would not throw one away.
> There are indeed better parts out there. It all depends on what you are
> trying to do.
>
> The phase noise of the unit is not as good as some of the 10 MHz stuff. I
> would not base a microwave synthesizer on one. It's short term stability is
> a "depends on the one you have". Testing would be needed here. Aging wise it
> should be pretty good. That assumes it was on power for a good part of it's
> life. If it's been on the shelf for 20 years, you may need to run it for a
> while ...
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of EB4APL
> Sent: Friday, January 14, 2011 10:05 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] CS reservoir depletion
>
> Hi,
>
> I can get a 00105-6013 xtal oscillator that is the type used in the
> 5051A and 5065 standards.  Does it worth for a standalone frequency
> standard or the more modern compact types such the miniature units from
> the telco towers salvage coming from China are more convenient?
> I realize that I need to provide both with a low noise power supply,
> specially for the frequency control voltage, but the in modern ones the
> supply issue is simpler and they give the (usually) more convenient 10
> MHz output instead of 5 MHz.  I don't know if the HP unit is usually
> quieter or more stable.
> I also I know that it depends of the intended use. In this case it is
> for my home lab which includes a compact Rb and a soon to be built GPSDO.
>
> Regards,
> Ignacio, EB4APL
>
>
>
> El 14/01/2011 7:01, Tom Van Baak wrote:
>>> Hi Tom been quite a while hope you are well.
>>> The never run out comments, not from me. Look at the
>>> previous thread I tagged onto. My humor is that most of
>>> the CS tubes we get are very long in the tooth usually
>>> way past whatever anyone would say they are good for.
>> That is so true. It always amazes to pick up a 30 year old
>> 5061A and find that it still works. Sometimes the reason is
>> that it is already on its 2nd or 3rd replacement tube before
>> it went to surplus. In which case you're happy for years.
>> Other times it may be that the 5061A was used only very
>> intermittently and the tube is the low S/N original.
>>
>> A real gem would be one that was kept in cs-off mode except
>> for a few hours once a month to keep the OCXO within some
>> loose cal lab spec. Even after decades it would be as good
>> as new.
>>
>> For many frequency applications there is no reason to run
>> in full cs-locked mode. This is also true if you need good
>> short-term stability. The free-running OCXO in most Cs (and
>> GPSDO for that matter) are more stable short-term when the
>> loop is open.
>>
>> /tvb
>>
>>
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