Here is a preview of my long range wireless modem.
It's based on a Radiocrafts 868Mhz module (RC1180HP) with 450mW RF output power and good receiver sensitivity.
I'm going to use this for modem telemetry and antenna tracking, one in groundstation and one in the airframe
It has the following features:
1x LCD 102x46dots
1x MicroSD slot
3x analog to digital inputs
1x SPI (if LCD is not used)
1x RS232 (TTL)
2x Timer outputs (used to connect a 4017 to drive servos)
4.5 to 32volt DC input
Dimensions are 44mm x 55mm x 5mm
More info will be added later.....and yes it will be open-source, I will share all design info if you want....
Here you can find the schematics: RC1180HP-Modem.pdf