Thanks, Joe! Tom Holmes, N8ZM Tipp City, OH EM79
> -----Original Message----- > From: [email protected] [mailto:[email protected]] 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 <[email protected]> wrote: > > Joe... > > > > Any tips on how you set it up to get those messages? > > > > Tom Holmes, N8ZM > > Tipp City, OH > > EM79 > > > > > >> -----Original Message----- > >> From: [email protected] [mailto:[email protected]] On > >> Behalf Of Joseph Gray > >> Sent: Thursday, March 03, 2011 4:07 AM > >> To: [email protected] > >> 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 -- [email protected] > >> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
