A couple of nights ago I started range testing the TTN Gateway I had build using a Raspberry Pi and a dragino sheild.
For my test rig I used an Arduino Mega 2560 with matching dragino sheild, a GPS with custom RS232 to TTL level
translator (2 resistors and a NPN transistor). The results can be viewed here (untill I manage to break the link :-)) :
The single channel gateway has a Bandwidth of 125KHz and Spreding factor 7 and frequency 916.8MHz,
Downlink is BW = 500KHz SF7 freq 923.3 MHz.
I plan to test the downlink soon, by registering a device using OTAA instead of ABP.