[time-nuts] To improve a Tbolt?

[John Miles]

I've upgraded the graph on the http://www.ke5fx.com/tbolt.htm page to show
the performance of my Thunderbolt from the TAPR group buy (in orange) next
to the traces for my older unit before and after the 10811 upgrade.

There is no upside to tinkering with the OCXO on the TAPR units, unless you
have something that can beat a 10811.  You could replace it with a rubidium
source and get better short-term stability, but I don't think swapping one
quartz OCXO for another would be a useful thing to do.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Ulrich Bangert
> Sent: Friday, November 21, 2008 2:58 AM
> To: Time nuts
> Subject: Re: [time-nuts] To improve a Tbolt?
>
>
> I would be interested in this information as well!
>
> Best regards
> Ulrich Bangert
>
> > -----Ursprungliche Nachricht-----
> > Von: time-nuts-bounces at febo.com
> > [mailto:time-nuts-bounces at febo.com] Im Auftrag von Dan Rae
> > Gesendet: Donnerstag, 20. November 2008 18:58
> > An: time-nuts at febo.com
> > Betreff: [time-nuts] To improve a Tbolt?
> >
> >
> > I have been reading with interest John Miles' page about his Tbolt
> > 'upgrade'.
> >
> http://www.thegleam.com/ke5fx/tbolt.htm
>
> I have a newly acquired Tbolt here, and also have lying around an almost
>
> identical 10811-60111 OCXO which I am considering using with it, exactly
>
> as John describes.  However my Tbolt is of a later vintage than John's
> (2005 date code) and I wonder if that would show as big an improvement
> as John reports.  The on board OCXO on this one has a Trimble sticker on
>
> it, but otherwise looks similar to the one pictured on John's page.  The
>
> GPS receiver area of my board also looks very different, but I don't
> think this would have any effect.
>
> Not having the sort of phase noise measuring facilities here to be able
> to test it, I am wondering if anyone else has done this with a similar
> vintage Tbolt, and could say if it is likely to show as big an
> improvement as John seems to be getting.
>
> I was a little surprised at the amount of short term variation, of the
> order of minutes duration, that I was seeing on another Tbolt when using
>
> it to set a Rb standard.
>
> The obvious answer to my question is to try it and see, but I'd
> appreciate hearing from anyone who has tried it!
>
> Dan
>
>