For the longest time I've only been able to get about 500 meters out with my stock 3dR telemetry modules. No matter what settings I tried I couldn't get any further. There's been discussions in the forum about the specs of the radio modems and how far you can go. I've even swapped out telemetry modems thinking I might have fried one. Finally I broke down and ordered some parts from Servo City and built an antenna tracker. Then utilized a 900mhz -8dbi patch antenna I was using for FPV before I switched to 5.8ghz. Today I finally made it out to 1.3km! This is with the patch antenna and a stock antenna onboard the plane.
I had to reduce my telemetry speed clear down to 2400 baud before I could get a relatively solid signal back to the ground station. Anyone have any suggestions for 3dR telemetry radio settings? I'd love to make it out to 2 km on the 3dR modules and still have a solid telemetry link. I've been eye'ing the RDF900's for quite some time. As much as I'd love to throw more power at my signal I'd like to squeeze what I can out of what I have.