[aprssig] Kenwood/Garmin adapter update

Wes Johnston, AI4PX wes at ai4px.com
Sun Sep 7 21:36:09 CDT 2008

Does it power the GPS from the de-9?
Our lives begin to end the day we become silent about things that matter

On Sun, Sep 7, 2008 at 7:49 PM, Scott Miller <scott at opentrac.org> wrote:

> I've got the first couple of prototypes of my Garmin <> NMEA converter
> board build and running - beta testing will be starting soon.  This
> board is intended to work with the nuvi and StreetPilot models that have
> a mini-B USB connector (and support fleet management mode.)  Here's a
> picture of my TH-D7A hooked up to a nuvi 350:
> http://n1vg.net/images/nuvi_d7.jpg
> So far only the nuvi 350 works right for waypoint display, but I think
> Garmin's going to have a solution for that soon.  Here's another shot of
> the converter circuit, this one with a DB9:
> http://n1vg.net/images/nmea_converter.jpg
> It'll probably get overmolded directly into the cable eventually, but
> for now it's just encapsulated in adhesive-lined heat shrink tubing.
> Here's the PCB itself:
> http://n1vg.net/images/nmea_pcb.jpg
> Afraid I only had my phone camera handy when I took that, so the quality
> is bad.  The whole thing is about 2mm thick.  I probably could have made
> it a little narrower, but I got tired of playing with the routing.  It's
> got a 20 MHz HCS08 processor on it, a clock crystal, ESD protection, and
> an RS-232 transceiver.  It's all powered by the nuvi (but not when the
> nuvi is on battery power).
> I've only got a few prototypes, and I've already got beta testers lined
> up.  I'm afraid I can't build any more until I get more USB cables
> (they're non-standard 5-conductor cables with a custom right angle
> overmold, and the factory is just getting started on them) and soldering
> a 7mm, 48-contact QFN chip by hand is exceedingly tedious.  I also
> haven't built a programming fixture yet, so loading the firmware
> requires soldering wires to test pads and then removing them again when
> it's done.
> But it works!  Plug it in to the nuvi and it starts spitting out GPGGA
> and GPRMC sentences.  It'll take GPWPL and PKWDWPL (D710) waypoint
> inputs, and in the case of the PKWDWPL format it'll pick an appropriate
> symbol as well.
> I'm planning on a retail price of $48 for the converter cable.  I'll let
> everyone know when it's available.
> Scott
> N1VG
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