[time-nuts] Adafruit (MT3339) problems today

Bob Stewart bob at evoria.net
Thu Apr 10 18:46:54 EDT 2014

Hi Jim,

Could you give me a bit more information on using WAAS?  I disabled "gpsd" and then ran the command (gpsctl -x "PMTK301,2" /dev/ttyS1) which I thought would enable WAAS, but xgps shows that PRN51 is not in use.  At least I think that PRN51 should show active with WAAS enabled.  But I am totally clueless about this.  In 2000 words or less, what am I missing?  =)  Sometimes I wonder if gpsd is meddling with things and causing me problems, in spite of their stated goal of non-interference.


> From: Jim Harman <j99harman at gmail.com>
>To: Bob Stewart <bob at evoria.net> 
>Sent: Thursday, April 10, 2014 5:25 PM
>Subject: Re: [time-nuts] Adafruit (MT3339) problems today
>Mine would do that when the antenna was indoors. It is much more stable since I put it outdoors on a windowsill. Do you have WAAS or equivalent available? Enabling that helped my stability as well. 
>On Apr 10, 2014 5:51 PM, "Bob Stewart" <bob at evoria.net> 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.
>>Bob - AE6RV
>>time-nuts mailing list -- time-nuts at febo.com
>>To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>and follow the instructions there.

More information about the time-nuts mailing list