Posted by JONATHAN on September 10, 2007 at 3:10pm
I had a lot of faith and confidence in the SPEKTRUM DX7, so I decided to go ahead with the integration of the hobby wireless 500mW 2.4GHz AV TX into my UAV. I plugged everything in, conducted a range test and proceeded to take-off. Video Feed was great and I was in CONTROL......so I thought. after about 45 seconds and a partial loop around my airfield I lost control of the aircraft. Luckily my failsafe settings kicked in and the aircraft began its gentle right hand glide.....10 maybe 15 seconds went by then I regained control of the aircraft and attempted to circle in for approach...lost control again. This went on for about 2 minutes until there was no longer enough air between the aircraft and the ground to be considered "flying". Yes it all ended in a crash. Luckily a pine tree had softened the impact with the ground and the only damage was to the wing which is very easily replaced. after this whole situation I conducted a little investigation and came up with something that I should have checked prior to my flight. 1) frequencies. the DX7 operates in the 2.400GHz - 2.4835GHz range and the hobby wireless 2.4GHz 500mW AV TX operates from 2.410GHz(CH 1)- 2.510GHz(CH8) 2) Although SPEKTRUM claims BULLETPROOF link in all conditions...everything has its weakness. (I STILL HAVE FAITH IN MY SPEKTRUM RADIO!) I conducted a taxi range test with just my fuselage and with the same set up as yesterday when I crashed but I changed the Freq. on the AV TX to CH 8 - 2.510GHz.....just out of the SPEKTRUM's freq. and the system worked without interference out to and beyond the approx distance of the incident yesterday....so far so good. Once I get a replacement wing I will do some more testing prior to flying again, but I am fairly confident that the freq. change made a world of difference. Anyone out there have anything like this happen? If so, feel free to add to this discussion!