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[aprssig] gps/tnc linkup

Greg D. ko6th_greg at hotmail.com
Wed Feb 18 05:04:21 UTC 2009


Ah, yeah, that too.  :-)  My eTrex Vista HCx definitely does the USB Storage thing when I plug it into my PC, and I've searched around all the docs, and it is only got a USB slave/client/whatever.  No host mode, and no RS-232 Serial buried on secret pins.

I bought it knowing all this, hence the GPS board hanging off my Kenwood TH-D7...
http://home.wavecable.com/~ko6th/IMG_0235b.jpg

Greg  KO6TH


> Date: Tue, 17 Feb 2009 20:34:19 -0800
> From: scott at opentrac.org
> To: aprssig at tapr.org
> Subject: Re: [aprssig] gps/tnc linkup
> 
> If all the handhelds have is USB, then no, this won't work.  It's not a 
> USB host.  It *would* be possible to build one - it would take a 
> considerable amount of work, a larger processor, and probably an 
> external power supply, though.  I have a couple of development boards on 
> hand that I got to experiment with that, but I dropped it when I 
> discovered that most of the current USB models do NOT do position data 
> at all over USB - they just go into mass storage mode as soon as they're 
> connected.
> 
> Scott
> N1VG
> 
> Greg D. wrote:
> > I'm pretty sure that the Garmin eTrex HC series only have USB, and if I 
> > recall Scott's messages, the protocol they use over USB is not NMEA.  
> > So, unless his new magic cables can decode this stream from the handheld 
> > units (I thought it only worked on the Nuvi-series), I think you're out 
> > of luck.
> > 
> > If you haven't purchased the GPS itself yet, there still are some with 
> > serial interfaces.  The larger GPSMAP-60 has it, as do the original 
> > eTrex (before the H-series).
> > 
> > Greg  KO6TH
> > 
> > p.s.  if those Magic Cables do work with the handheld units, I have an 
> > eTrex Vista HCx that would be nice to connect one to...
> > 
> > 
> >  > From: radiooperator at comcast.net
> >  > To: aprssig at tapr.org
> >  > Date: Tue, 17 Feb 2009 13:39:24 -0500
> >  > Subject: [aprssig] gps/tnc linkup
> >  >
> >  > hi folks, i have one of them gps cables i got from aea that has a 
> > phono plug
> >  > that suppose to plug into a gps, anyone seen a gps with a input/phono 
> > plug?
> >  > i have not, anyway wanting to try a garmin extrex hc series or another
> >  > garmin gps that i have to a kpc3+ and wondering how the easy way to 
> > do it.
> >  > i know im going to have to cut some wires to the gps,s to get the 
> > input and
> >  > output for the device. does anyone have any ideas the best way to go?
> >  > wondering why no one is selling the cable to hook the gps to tnc besides
> >  > the aea phono plug unit. thanks in advance. just would like to give 
> > gps/tnc
> >  > aprs a try tracking a vehicle. 73 kc8gkf
> >  >
> >  >
> >  >
> >  > _______________________________________________
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> >  > aprssig at tapr.org
> >  > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
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