Re: [altusmetrum] Soliciting GPS Troubleshooting Tios
I'm not an expert on things 'GPS' however as a Ham radio amateur I can say vertical orientation is important, a clear view of the southern sky, correct operating voltage, and patience. Tim R On Apr 17, 2013, at 3:52 AM, Dan Moses (Home) wrote: In preparation for the NASA SLI launch this Saturday, I had the team turn on their TeleMetrum to simulate the up to 1 hour hold time on the pad. It has been months since the altimeter has been even turned on. In general, we could not get any GpS satellites (0). We left the unit on for the hour and the monitor indicated 3 sats had been found, but no lock (none expected, of course). We took the altimeter for a walk around the neighborhood in the hopes of avoiding shadowing, but with no improvement. We will try again today in case the local ionosphere LOS was particularly strange yesterday, but that is really grasping at straws. Can someone point us in the right direction to troubleshoot the problem? Dan and the FCHS SLI Team Somewhere in the saddle on the way to AL ___ altusmetrum mailing list altusmetrum@lists.gag.com http://lists.gag.com/mailman/listinfo/altusmetrum ___ altusmetrum mailing list altusmetrum@lists.gag.com http://lists.gag.com/mailman/listinfo/altusmetrum
Re: [altusmetrum] Soliciting GPS Troubleshooting Tios
Dan Moses (Home) r...@verizon.net writes: In preparation for the NASA SLI launch this Saturday, I had the team turn on their TeleMetrum to simulate the up to 1 hour hold time on the pad. It has been months since the altimeter has been even turned on. In general, we could not get any GpS satellites (0). We left the unit on for the hour and the monitor indicated 3 sats had been found, but no lock (none expected, of course). We took the altimeter for a walk around the neighborhood in the hopes of avoiding shadowing, but with no improvement. We will try again today in case the local ionosphere LOS was particularly strange yesterday, but that is really grasping at straws. Can someone point us in the right direction to troubleshoot the problem? Take a look at the 'table' view in AltosUI -- that'll give details on precisely which sats you're seeing and what kind of C/N0 numbers they're showing. -keith pgpEegJXguDvV.pgp Description: PGP signature ___ altusmetrum mailing list altusmetrum@lists.gag.com http://lists.gag.com/mailman/listinfo/altusmetrum
Re: [altusmetrum] Soliciting GPS Troubleshooting Tios
Keith Packard kei...@keithp.com writes: Take a look at the 'table' view in AltosUI -- that'll give details on precisely which sats you're seeing and what kind of C/N0 numbers they're showing. I test the GPS functionality on every board we sell, so I've watched the acquisition and lock process progress probably more than any other person on our products. Every once in a great while, I see a GPS chip that kind of gets stuck. If you haven't achieved lock within a half hour or so, I'd definitely suggest disconnecting the battery for a couple minutes and then trying again. Even if you power-cycle the board, if the battery is connected the GPS chip's ephemeris information is retained. Disconnecting the battery forces a true cold start to occur. I live in the woods, and the weather doesn't always support going outside to test things. As a result, attaining lock with any GPS receiver can be interesting at times. But, my experience has been that if I have at least one satellite with a C/N0 number above 35, the board is fine and will lock ok at a launch site where you tend to have a nearly hemispherical clear view of the sky. Bdale pgpmM5EgI6Sjy.pgp Description: PGP signature ___ altusmetrum mailing list altusmetrum@lists.gag.com http://lists.gag.com/mailman/listinfo/altusmetrum
