Hi Sascha, perhaps I got the solution, with our +12dBm output/
-110dBm input, wireless data transceiver.
It's an radial range, outdoors up to 2 km
Rate 4800bps, even 9.6, but i prefer to slow down the rate
to 4.8 depending on many reasons.

If you send me your e-mail, I will replay a product-description.

Regards magnus@comlink.se