DFM-06 Modification to GPS-Mouse.

DFM-06 Details: https://www.gruan.org/instruments/radiosondes/sonde-models/graw-dfm-06/

Telit Jupiter JN3 Details: https://www.telit.com/m2m-iot-products/positioning-timing-modules/positioning-gps-jupiter-n3

Remove Batteries, Desolder 4 legs and remove tuner print and Sensor arm.

Wire pin 20 TX and pin 21 RX on JN3 GPS Module.

Wire on brown condesator above, left +3.3V and right -GND.

Connect to TTL-USB converter.

Build together ->

Connect with USB cable to computer.

Download and start SirfDemo select COM Port (most probaly Prolific driver is needed on Windows) and use 9600 Baud to connect.

JN3 starts itself in Binary Sirf mode.

From action menu choose Switch to NMEA Protocol.

Choose a desired Baudrate.

DFM-06 works in NMEA 4800 Baud mode.

Can use any GPS Application know.

But remember to follow whole procedure again when disconnecting the GPS Mouse, it will start again in Binairy Sirf Mode..

A batch file can be made for auto startup GPS mouse in NMEA Mode .

Example Com:1 4800 Baud:

@echo off

echo Switching DFM to GPS mouse.

mode com1 baud=9600 parity=n data=8 stop=1

copy sirfbinary2nmea.txt com1:

echo Use now 4800 baud in SM.



Make dfm.sh


dmesg | grep ttyUSB0

echo "Switch DFM06 from binary 2 NMEA mode..."

cd /home/gps

sudo stty -F /dev/ttyUSB0 speed 9600

echo "Insert sirfbinary2nmea..."

cat sirfbinary2nmea.txt > /dev/ttyUSB0

echo "Switch to 4800 Baud..."

sudo stty -F /dev/ttyUSB0 speed 4800

echo "Done DFM on 4800 Baud :)…"

Before make some sudo chown -R <username:username> /dev/ttyUSB0

You can use GPSD with some build in apps or use FoxtrotGPS/Viking.

gpsd /dev/ttyUSB0

xgps /dev/ttyUSB0

cgps -s

gpsmon /dev/ttyUSB0

Make it work in Wine:

Make sure GPSD is killed > killall gpsd

sudo adduser <your_username> dialout

ln -s /dev/ttyUSB0 ~/.wine/dosdevices/com1

Try setting a registry key in ~/.wine/system.reg like this:

[Hardware\\Devicemap\\Serialcomm] 1131331688


You can know use Windows GPS Applications in Wine.


Some tutorials floating arround the net show a DFM with batteries connected,

So it can store NMEA mode in memory, for continous usage its not safe due the +3.3V, they can explode...

USB-TTL Converter can be found on Ali/Ebay.

Thanks fly out to Zauberkopf.

Happysat 2018