[aprssig] Kenwood/Garmin adapter update

Scott Miller scott at opentrac.org
Mon Sep 8 10:13:00 CDT 2008

I left a pad on the NMEA side of the board for 5 volt power.  It's not 
connected on this particular cable, but yes, you should be able to power 
it that way.  The Tracker2 will do it, sort of, but it goes into current 
limiting at around 400 mA if the nuvi's battery is charging.


Wes Johnston, AI4PX wrote:
> Does it power the GPS from the de-9?
> Wes
> ---
> 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 
> <mailto: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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