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

WarrenS warrensjmail-one at yahoo.com
Sat Nov 27 17:14:39 UTC 2010


Right, For best performance, in fix mode operation, for a Tbolt, you don't 
want to run at zero (or 5) degrees.
This is just one test in a series of necessary test, if one wants to improve 
their Tbolt to better than the Default settings.
The zero degree mask is a temporary setting so that the Tbolt can do a full 
antenna signal strength vs. position survey using Tbolts's "SAS" command.
The purpose of which is to find the BEST elevation setting, which turns out 
to be more like 15 to 35 deg for the typical Tbolt setups I've seen.
Attached is a limited survey where the finial cutoff was set at 20 degrees.
The cut off was set there because the full survey showed that in this case 
"BAD" things where starting to happen around 20 degrees

ws

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[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

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-----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 
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