Thread: New Product New Devo 7E Radio from Walkera!!
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Old Jul 29, 2012, 06:14 AM
thwaitm is offline
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Quote:
Originally Posted by thwaitm View Post
I've not seen any specs on the transmit power of the 7E but it has no 'AMPLI' setting which means whatever it it, it's fixed.
My guess is that it's 10mW not 100mW, but a multiple of 10 in power output only equates in an ideal situation to a doubling of range (read more on inverse square laws and EM radiation).
Quote:
Originally Posted by AbeFM View Post
Interesting, one would think a factor of 3.....
Well... yes - but when I said 'ideal situation' I meant in terms of your flying area (i.e. wide open field with no obstructions), not that all efficiencies in the TX were ideal as well... but you are correct (and can officially call yourself a smartae! )

and here's some Excel based maths for everyone else.
Assuming a 10mW TX does ~1000m...

Power(mW) ................................. Range (m)
10 ............ =300/SQRT(1/10) ........ 948.6832981
100 .......... =300/SQRT(1/100) ...... 3000
1000 ........ =300/SQRT(1/1000) ..... 9486.832981
10000 ...... =300/SQRT(1/10000) ... 30000

But then there are reflections, absorption, interference, etc, etc in the real world to deal with compared to the theoretical world so one might wish to leave a bit of a safety factor in there.
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