[time-nuts] Another Trimble Tbolt question....

Darrell Robinson darrell at shaw.ca
Sun Mar 30 07:19:22 UTC 2008


More guessing.  I wonder if the altitude you see is from the difference
between Mean Sea Level and Height Above Ellipsoid?

This document has a map on page 7 -
http://www.avionicswest.com/PDFiles/alt2.pdf

Still no expert

Darrell



----- Original Message ----- 
From: "Michael Baker" <mpb45 at clanbaker.org>
To: <time-nuts at febo.com>
Sent: Saturday, March 29, 2008 5:49 AM
Subject: [time-nuts] Another Trimble Tbolt question....


> Hello, All--
>
> Thanks to the collective savvy of this list and the
> patient assistance of Ken Winterling <wa2lbi> I was
> finally able to get my Tbolt to stop requiring me
> to configure the COM-4 channel every time I ran
> the monitoring software.
>
> So-- I had such good luck with that question, I'm
> going to pester the group with one more Tbolt question:
>
> In the "Position" area of the Tbolt monitoring display
> my altitude is given as 1.4 meters.   The USGS topo map
> and a recent survey both say that the ground level
> at my house is 84 feet above MSL.  The antenna for the
> T-bolt is on the top of my house 19 feet above the ground.
>
> If I open SETUP / POSITION and "SET ACCURATE POSITION"
> to, say....: 28 meters and enter that value, the indicated
> altitude changes to 28 meters, but the next day or so,
> I always find that it has reverted to 1.4 meters.
>
> Admittedly, having a (relatively) accurate altitude
> display is of minor importance to me since my primary
> reason for having the Tbolt is for a decent 10MHz reference.
>
> However, as a matter of principle it would be nice to
> have the altitude display be a little closer!
>
> Any suggestions as to how to get the Tbolt to
> display a more correct altitude?
>
> Thanks!
>
> Mike Baker
> WA4HFR
> Micanopy, FL
> ---------------------
>
>
>
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