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[aprssig] Re: D700A gps interface problem

Andrew Rich vk4tec at tech-software.net
Sat Dec 11 04:28:43 UTC 2004


I have of late seen lots of different variants of the GPRMC NMEA
sentence. The most obvious difference is in the time and speed fields.

Example


$GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62

$GPRMC,081836.00,A,3751.65,S,14507.36,E,0.0,360.0,130998,011.3,E*62

You can see that some GPS's have extra time digits, and some use 000.0 for speed and 0.0 for others.

But the main thing is that the position information stays the same between brands.

If anything, they would have to compensate for the extra digits in time, and the different speed logic.

Food for thought

I came across this writing my own software to decode NMEA. Not all brands are the same.

You gotta be carefull

Sounds like you had hardware probs . All good




On Sat, 2004-12-11 at 14:00, vxaprs at juno.com wrote:
> Thanks to all who had suggestions on solving this.  Finally sent the unit back to Kenwood (still under warrantly).  No info on what they found, but they replaced a chip and a circuit board and the unit is working fine now. Turn-around was less than a week.
> 73,
> BOB/k4mut
> ---------- Forwarded Message ----------
> 
> I am trying to get a Deluo gps to work with the new D700A I bought last month.  I have 5 Deluo serial gps, and they all work with my 2 other D700A but none work with the new one.  My garmin III+ and eMap both work with the new one.  On the old D700A, I get P.MON readouts from the Deluo, but not with the new D700A. The garmins give the normal P.MON readouts on all units.  Kenwood says that "nothing has changed with NMEA 0183 in TM-D700A, your TM-D700A is compatable with any garmin that has NMEA 0183." Deluo says their gps is fully NMEA 0183 compatible.  
> 
> I thought I recalled something about Kenwood having a version upgrade that would cause problems with gps. Do any of you recall this?
> 
> I would like to try to interpret the gps output to see if I can figure out what is different. I can look at gps output in my older D700A and also with a diagnostic that Deluo provides, but I don't know how to interpret the output. Would someone please point me to references. Better yet, Elmer me through solving this problem.
> 
> Kenwood also said "Kenwood is unable to assist with any questions about GPS units. We do not manufacture any so it is very hard to suggest or assist with any questions about them. We are unable to try and test every GPS unit available. Your best bet may be to go to any of APRS or GPS user group web pages for assistance and recommendations."  I suspect that if I send the unit back to them, they will just tell me that it works with their garmin gps (works with my garmin, too).
> 
> Thanks,
> BOB/k4mut
> 
> 
> 
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