Kompressor
Premium
join:2002-02-12
Huntington Beach, CA | reply to RadioDoc
Re: hmmm.....
Depending on what frequency you are transmitting on, it is possible for a simplex signal to go around the world. |
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RadioDoc
58ef2c0
Premium,ExMod 2000-03
join:2000-05-11 | Well, them frequencies are not used for plain vanilla 802.11 WiFi...
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Toolmaster of La Grange. |
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karlmarx
join:2006-09-18
iraq
 ·Fairpoint Communic..
| reply to Kompressor
well, considering in general terms, the radio distance is defined as O(ptical) = sqrt(2h(r))+sqrt(2h(t)), where O = distance to optical horizon, and h=(r)receiver height, and h(t) is transmitter height. So assume the antenna is 20' at both sides. The optical distance would be approximately sqrt(2*20) + sqrt(2*20) = Appx 12.5 miles.
Now we calculate the loss.
PL = 117 + 20log10fMhz-20log10hthr+40Log10D
Where 117 = Constant
2.4Ghz
20' and 20'
Distance of 12 miles
So it's about 175db loss over that distance. Thus, the antenna is the key, because with a 175db loss, the antenna is going to have to be pretty tight.
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