[time-nuts] Thunderbolt & Lady Heather 48 hour precision survey

William H. Fite omniryx at gmail.com
Sat Nov 27 13:06:40 EST 2010


Interesting.  I had my tbolt mask set at 10 degrees.  Raised it to 20 and
got the same position but a 60cm difference in altitude.



On Sat, Nov 27, 2010 at 5:36 AM, Rob Kimberley <rk at timing-consultants.com>wrote:

> Careful setting the elevation mask that low. I wouldn't go below 5 degrees.
>
> I know you want best geometry for best position determination, but there
> are
> all sorts of effects down at those levels which will degrade your results.
>
> Rob Kimberley
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Robert Darlington
> Sent: 26 November 2010 9:23 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Thunderbolt & Lady Heather 48 hour precision
> survey
>
> I'm running another test now and it's significantly improved after the 48
> hour survey.  Before I'd see several degree swings over the course of an
> hour, now it's more like 1.1 degrees in the last 8 hours.  The problem here
> is I didn't do anything to the styrofoam box, but the idea was to keep
> temperature swings swinging slowly.  For all I know I might be fighting the
> Thunderbolt.
>
> I'm running another test under the direction of Warren S. and will post
> another screen shot late tonight after I collect about 24 hrs of data with
> the elevation mask set to zero degrees.  I'm determined to tune this thing
> to be better than it was out of the box!
>
> -Bob
>
> On Fri, Nov 26, 2010 at 12:41 PM, Dave hartzell <hartzell at gmail.com>
> wrote:
>
> > On Fri, Nov 26, 2010 at 6:41 AM, Robert Darlington
> > <rdarlington at gmail.com
> > >wrote:
> >
> > > I keep it in a styrofoam beer cooler surrounded with bottled water
> > > in a draft free area and it's been all over the map.
> >
> >
> > Robert-
> >
> > Are you doing this for temperature stability?  How stable is it?
> >
> >
> > Dave
> > _______________________________________________
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