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15 hours ago, Paul De Tourtoulon said:

Not understanding of reading all of the above,? I was glad to see that Cuban8 wrote, "sensitivity of our receivers" and what about aerials,,,

 I use 3 different receivers

the Futaba 617, around 500 metres of range 

the 6014Hs gives me over 2.500 metres

the Frsky Tfr 6 gives around 800 metres, all have the same aerials and fitted to the same drone, in the same position,

 Not forgetting the orientation of your Tx aerial,,,,,

Also with my FPV gear on 5.8, different aerials give different results,

 

It's a long time since I studied radio and RF techiques at college, but the receiver and aerial are a package and do need to be designed to work together to give best results. I suppose manufacturing costs and simplicity of operation for the user plays a part, and we wind up with something that's adequate but not necessarily the very best technical solution available.

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