It's been a while, but I thought I'd report on my findings. I added some more aluminum tape to the shielding on the camera and that seemed to bring the GPS lock times back in line with when the camera was off (3-8 minutes). I wasn't able to do any open field testing so I can't confirm if that will help or not.
I'm going to try Ryan and David's method to get the TM to GPS lock with the nose sticking out of the tower, then carefully lower it into the tower. I'm assuming that it will probably lose lock again once I lower it. Is it safe to launch the TM if it loses GPS lock after I lower it into the tower? It will be under chute for ~15 minutes, so I'm sure it will have time to reacquire lock between the time it's launched and the time it hits the ground again. On Mon, Jul 13, 2015 at 8:45 PM, Chris Attebery <[email protected] > wrote: > Thanks Terry. I might try taking the TM off the tray to see if if makes > any difference. If so I'll try cutting a new tray out of 1/8 plywood. > > On Mon, Jul 13, 2015 at 7:53 PM, W7AMI <[email protected]> wrote: > >> I don't have a TeleMetrum so I can't do side by side tests. I did set >> up my TeleGPS tonight and roughly timed how long it took to lock up. It >> locked on with a 5 satellite fix in under 1 minute. By three minutes it >> had a 10 satellite lock and one more in view. This was in my back yard >> with the TeleGPS inside the nosecone with the GPS antenna positioned >> vertically and looking at the horizon. I only tried it once so it's not >> much of a sample size. >> >> Terry >> >> On 7/13/2015 12:39 PM, Bdale Garbee wrote: >> >> FWIW, based on testing here, I would expect >> TeleGPS to be similar to TeleMetrum but we get better reports on it. I >> wonder if that's because it's often just turned on earlier in the prep >> process, ergo longer before launch so it doesn't **seem** to take as long, >> or if anyone has actually done side by side testing in the field? >> >> >> >> _______________________________________________ >> altusmetrum mailing list >> [email protected] >> http://lists.gag.com/mailman/listinfo/altusmetrum >> >> >
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