From: "Darrell Robinson" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Sunday, March 30, 2008 3:19 AM Subject: Re: [time-nuts] Another Trimble Tbolt question....
> > 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" <[EMAIL PROTECTED]> > To: <time-nuts@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 For what it's worth, I have two of these units and they are horrible on altitude but otherwise seem to be ok. Just a thought ! Phil _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.