[time-nuts] NMEA time off

[Tom Holmes]

Thanks, Joe!

Tom Holmes, N8ZM
Tipp City, OH
EM79


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Joseph Gray
> Sent: Thursday, March 03, 2011 2:02 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] NMEA time off
> 
> Tom,
> 
> Using a real PC serial port which sets DTR, you just need to send the
> string ASTRAL to the Tripmate. Then it will start sending NMEA data to
> the PC.
> 
> For a mod which takes care of DTR and feeds ASTRAL back to selfstart
> the Tripmate, look here:
> http://www.nwaprs.info/delormetinytrackproject.htm. This method causes
> the Tripmate to stay powered up all the time, so you should not use
> the battery pack.
> 
> Joe Gray
> W5JG
> 
> 
> On Thu, Mar 3, 2011 at 11:33 AM, Tom Holmes <tholmes at woh.rr.com> wrote:
> > Joe...
> >
> > Any tips on how you set it up to get those messages?
> >
> > Tom Holmes, N8ZM
> > Tipp City, OH
> > EM79
> >
> >
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> >> Behalf Of Joseph Gray
> >> Sent: Thursday, March 03, 2011 4:07 AM
> >> To: time-nuts at febo.com
> >> Subject: [time-nuts] NMEA time off
> >>
> >> Months ago a bought an old Delorme Tripmate for $5 (for that price,
> >> why not?). Tonight I finally got around to fooling with it. After
> >> finding out that it was designed to talk only to Delorme software
> >> without some finagling, I got it to spit out NMEA data to Teraterm and
> >> other programs.
> >>
> >> I discovered two things about the Tripmate. First, the sensitivity
> >> sucks indoors. It is currently showing 13 satellites visible, but only
> >> tracking three. Second, the time data from the GPRMC sentence is about
> >> two seconds behind UTC (using my calibrated eyeball for measuring).
> >>
> >> Is the time delay simply due to a firmware error, a low priority
> >> processing and outputting the NMEA data, or something else?
> >>
> >> I was going to attach the Tripmate to a modified Linksys WRT54G WiFi
> >> router and make it an el-cheapo NTP server. No reason, other than just
> >> for fun. Even without the two second delay, I know that the WRT54G
> >> will not be a very accurate NTP server. I was assuming that I'd be
> >> able to at least get better than one second accuracy, though. I guess
> >> I can just put in a large fudge factor for ntpd to compensate.
> >>
> >> Unrelated to the above, I also have a Timex Ironman runner's watch
> >> with mating GPS unit (another $5 purchase). The GPS is worn on the arm
> >> and transmits data to the watch for displaying distance, speed, etc. I
> >> need to get a battery for the watch, but I believe everything works.
> >> Taking the GPS unit apart, I find that it is a Garmin. I see some
> >> interesting test points on the circuit board, so I'm going to see if I
> >> can get some serial data directly from the GPS, without using the
> >> watch.
> >>
> >> Joe Gray
> >> W5JG
> >>
> >> _______________________________________________
> >> 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.
> >
> >
> > _______________________________________________
> > 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.
> >
> >
> 
> _______________________________________________
> 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.