On Sat, 28 Aug 2004 18:27:45 +1000 "ian wells" <[EMAIL PROTECTED]>
writes:
> can anyone give a idea of difference of range when swaping
> a 6db base ant to a 9 db ant.
> would it be close to 2x the range in kms
In theory, +3dB gets about 40% range increase; to double requires +6dB.
Remember your geometry lessons for area of a circle (Pi R^2) ?
Imagine maintaining a "minimum depth" of a water puddle, as the puddle
grows in size..
Substitute "minimum usable signal level"...
Simple example:
Say your existing setup gives 10-km range (radius) - that's 314-km^2 of
"usable signal" coverage area.
Double the ERP (+3dB) increases the "usable" area to 628-km^2 -- about
14-km range.
At 20-km range, the coverage area is 1256-km^2 -- 4x what you started
from; hence +6dB.
In Theory And a perfect world. YM(K?)MV.
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