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

Rob Kimberley rk at timing-consultants.com
Sat Nov 27 18:20:47 UTC 2010


Altitude is the least accurate parameter when doing this, as very rarely one
bird directly overhead. For best geometry you ideally want 3 birds 120
degrees apart and say 5 degrees above the horizon and one bird directly
above. Never that simple!

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of William H. Fite
Sent: 27 November 2010 6:07 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt & Lady Heather 48 hour precision survey

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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