I did a similar error when trying to change the projection reference system of a map of Guatemala. After a nonsense output I eventually found that I had used the wrong sign and the program treated it as it was Greece. The resulting map was more or less side looking!. Regards, Ignacio, EB4APL El 27/11/2010 18:01, Rob Kimberley wrote: > Was about half a degree west as far as I can remember. The confusion > occurred (I think - long time ago), because we had to enter a minus figure > for east and a positive for west, and I got the sign wrong. > > R > > -----Original Message----- > From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On > Behalf Of jimlux > Sent: 27 November 2010 3:31 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Thunderbolt& Lady Heather 48 hour precision survey > > Bob Camp wrote: >> Hi >> >> Of course you *do* have the excuse that you had to stop and think for a > second as to weather it *was* east or west of Greenwich ... >> Bob >> > > Is it not both? It was a few degrees west, but a mere 359.5 degrees east. > >

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@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@febo.com [mailto:time-nuts-bounces@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@gmail.com> > wrote: > > > On Fri, Nov 26, 2010 at 6:41 AM, Robert Darlington > > <rdarlington@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 > > _______________________________________________ > > 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. > > > _______________________________________________ > 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. > > > > _______________________________________________ > 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. >

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@febo.com [mailto:time-nuts-bounces@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@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@febo.com [mailto:time-nuts-bounces@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@gmail.com> > wrote: > > > On Fri, Nov 26, 2010 at 6:41 AM, Robert Darlington > > <rdarlington@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 > > _______________________________________________ > > 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. > > > _______________________________________________ > 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. > > > > _______________________________________________ > 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. > _______________________________________________ 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.