Hi Magnus, Yeah, there's no getting over the fact that it's a cheap $30 (or whatever it was) nav receiver. But I think the "walkabout" issue has been resolved. I think this thing is going to be OK for me, but I certainly wouldn't even give it a glance for professional use. Now that I've got the basic PLL code working with the new TIC, I'm starting to expand what I'm monitoring. There seems to be such a close connection between when it wanders around and when there are blips on the phase that I'm going to add position change monitoring shortly. Who knows? Maybe I can tune it out with the "poor man's sawtooth" that I've asked about. Yeah, I know. Just wrinkle your nose or look away in disgust if it bothers you. =) My goal is to see what I can get out of this; not what I can get for a few hundred dollars more. The project is more important to me than the result. I don't really have a concrete use for an accurate timebase. But, I have to say that after I've learned what I can with this, I'll probably look for something better; like maybe an LEA-4T or whatever I can get for cheap. I don't like the UT+ I have. Comms is overly finicky to get started. In fact, I don't even have a reliable way to do it after a cold start. And I don't like the +/- 52ns sawtooth.
Bob >________________________________ > From: Magnus Danielson <mag...@rubidium.dyndns.org> >To: time-nuts@febo.com >Sent: Friday, April 11, 2014 2:49 PM >Subject: Re: [time-nuts] Adafruit (MT3339) problems today > > >On 10/04/14 23:48, Bob Stewart wrote: >> My Adafruit has gone walkabout again. This is a different unit than the one >> I spoke about some months ago. It's been about 150 ft from my actual >> location, which has, of course, made a mess of my GPSDO. Well, at least it >> verified my "unlock" code. I did a POR and it seemed to come home, but now >> it's off to the races again. Has anyone else seen this behavior with this >> device? The only particular anomaly I can see is that it uses satellites >> close to the horizon for position fixing.I'm getting a reported SNR of 39 at >> 5 degrees elevation and 37 at 3 degrees, though I notice the sat at 3 >> degrees is not being used to calculate position. I never got around to >> finishing the choke ring antenna with those pie pans. Maybe that needs to >> move higher on my priority list. > >Can you raise the elevation limit? Low elevation causes many problems, >multi-path is certainly one but massive tropospherical delay errors. > >Maybe we should look at a bare minimum requirement for GPSDO-use? > >Cheers, >Magnus > > >_______________________________________________ >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.