Buggy firmware? Anyone seen the firmware floating around? -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Sanford Sent: Friday, 2 August 2013 10:46 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Trimble Nortel GPSTM Boards
I am seeing the same thing -- big jumps every single time a satellite is counted or not. Elevation mask 10 degrees, which should be very good and stable for my location. The unit also insists on converging to a bat altitude, then after a while declares stored position bad . .. then declares position good, even with bad altitude. Ideas appreciated. jimwb4...@amsat.org On 8/1/2013 6:31 AM, Bob Camp wrote: > Hi > > You may have your elevation mask set to low for your antenna or a multi path > issue from some other source. If the survey location is good to under a > meter and the signals are good, there should be very little shift as sats are > picked up or dropped. > > Bob > > On Aug 1, 2013, at 5:09 AM, gandal...@aol.com wrote: > >> Hi Charles >> >> Thanks for your comments, the surveyed position on this is looking >> pretty good but what I have now realised is that the severity of the >> jumps seems very much related to the number of sattelites being tracked. >> >> Switching from 8 to 7, or 7 to 8, sats seems to produce the biggest >> step change whilst switching in either direction between 5 and 6, for >> example, doesn't seem to show up at all on the monitored DAC voltage. >> Ok, I take that back, it does still seem to depend on the number of >> sats being switched between but I've just seen a switch from 5 to 4 >> sats induce a very noticeable step change in DAC voltage, so the >> relationship doesn't appear to be linear. >> >> Unfortunately I need to power this down now for a few days but will >> investigate more later. >> >> Regards >> >> Nigel >> GM8PZR >> >> >> In a message dated 01/08/2013 09:45:24 GMT Daylight Time, >> charles_steinm...@lavabit.com writes: >> >> Nigel wrote: >> >>> at times I'm seeing very noticeable step changes in the DAC voltage >>> on this one as that happens. >>> * * * >>> I am a bit surprised by the extent, a Mark Sims online plot from >>> 2012 shows some correlation on an NTGS50AA but not as noticeable as >>> this, and I don't recall seeing anything quite so pronounced on a >> Thunderbolt. >> >> IME (with TBolts), the magnitude of the DAC steps with constellation >> changes varies with the accuracy of the positional data used by the >> GPS. To a point, the more accurate the survey, the smaller the DAC >> jumps will be. (Other errors prevent reducing the >> constellation-change DAC steps to zero.) >> >> Mark has commented here on survey accuracy, and the methods he used >> in Lady Heather to maximize it. >> >> Best regards, >> >> Charles >> >> >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.