ORIGINAL: Sport_Pilot
Typo, should have been 20 times. However, I believe that 9000 feet is possible with a good transmitter and sensitive reciever.
Agreed. There was a video up a few weeks back of a guy in Australia testing 2.4 across the span of a bay (unobstructed line of sight). The transmitter was at one point and the heli at the other point. They were 1.7 miles apart, low over water and only a few feet off the deck. Pretty much a worse case scenario. Rock solid performance. You could not see the guy with the TX, only barely make out where he was supposed to be!!
I am serious about the primary and seconary user. I have heard this or seen it before and may need to refresh my memory of just what that is and how it works. It may have to do with the commericial use I discussed.
Refresh away, but I quoted the exact FCC Rule and it is crystal clear. We are not, and never have been, primary users of our slice of the 72MHz spectrum.