[time-nuts] TBolt OCXO replacement

[Henry Hallam]

Timing newbie here, so please educate me - why does aging matter?
Isn't the whole purpose of a GPSDO to completely eliminate long-term
drift?

Thanks
Henry

On Tue, Feb 16, 2010 at 2:36 PM, Bob Camp <lists at cq.nu> wrote:
> Hi
>
> A similar question though would be - once you have done all the
> "corrections" to the setup of the TBolt (damping, time constant,
> sensitivity) what's left to fix?
>
> I would *guess*:
>
> Lower aging
> Better TC
> Better short term
>
> Aging will likely get better the longer you leave the existing oscillator on
> power. You also may be able to pick between units to find the best of 4 or
> something like that.
>
> TC can be improved a number of ways simply by "helping" the existing part. I
> think we have gone over that in about 300,000 messages so far.
>
> Short term stability is about the only thing I can see that's still on the
> list.
>
> That gets you to the question - just how good do you think the 1 second AVAR
> is on the existing oscillator, independent of the TBolt environment?
>
> If for instance you have a 2.5x10^-12 OCXO in yours, you would only see a
> significant improvement with a sub 1.0x10^-12 OCXO. That sort of bounds your
> OCXO shopping list right there.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Scott Newell
> Sent: Tuesday, February 16, 2010 1:06 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] TBolt OCXO replacement
>
> At 11:37 AM 2/16/2010 , WarrenS wrote:
>>
>>In the ever ending battle to improve my TBolt's performance, I am in the
> process of upgrading a OCXO replacement I did to it a while back.
>>It would be Interesting to hear suggestions from others that have done
> similar sort of things and the results they have achieved.
>
> Did you check out John Miles's writeup?
>
> http://www.thegleam.com/ke5fx/tbolt.htm
>
>
>
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-- 
Henry Hallam

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