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

Rob Kimberley rk at timing-consultants.com
Sat Nov 27 10:36:08 UTC 2010


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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