ELRS Range Test Maxwell mini UAV

The Jumper T Pro ELRS transmitter was set to max 500W power on 2.4. This was a test of the antennas because the TX antenna comes stock mounted with horizontal polarization, and the antenna in the plane is vertically polarized, so I wanted to test the range, while alternating holding the transmitter sideways, and straight (normal). That is why you see the plane enter into failsafe in Arduplane and deviate occasionally from its course during the flight. max distance was about 15km, and the conclusion of the test is that YES IT MATTERS WHICH WAY THE ANTENNAS ARE MOUNTED. Do not buy one of these mini "drone" ELRS transmitters with the horizontal antenna if you want to fly a plane long range. The plane first failsafed at about 3 km with the wrong polarization.

[@girenloland]

You can try with diversity receiver. (Radiomaster RP3) And mount antennas to form a "L" shape. I run this with Emax TX module. It goes almost 500m on 10mw. 1000m on 25mw.

[@bearospaceinsider5250]

Yea, so that RP# is a diversity reciever. the problem is that the controller antenna is horizontal. If I mounted a second diversity receiver antenna on the plane horizontally, it would have the same problem at range, as soon as I turned the aircraft. the null zone would be aligned, and back to the same problem.

[@girenloland]

​@@bearospaceinsider5250 If you mount one horizontally and the second one vertically the orientation of your aircraft does not matter. So that it resembles an L shape.

[@bearospaceinsider5250]

@@girenloland The orientation of the aircraft will not matter much then. but if the orientation of the single transmitter antenna is only horizontal, and the aircraft is flying upright with one vertical and one horizontal antenna in an L shape, then the vertical antenna on board the aircraft cannot work effectively. no problem yet. that is where the horizontal antenna on board the aircraft comes into play. except there is a problem. at the tip and the base of each dipole (the ends), there is a null point. at some point in a turn, the null point for the horizontal aircraft antenna will line up with the position of the controller antenna, and that is a problem. I'm assuming that the radiation pattern is like a donut, mostly round but with a null on the ends. Is that correct, and does it make sense?