A simplied formula for use when both antennas (I know, antennae) are the
same height, assuming a smooth earth's surface and assuming an earth's
radius of 4000 miles, which is close when we take into consideration the
"RF bending effect at UHF, " would be:
2.4 times the square root of the antenna height (using the height
of only one of the two antennas).
Thus, you should expect an approximate distance coverage of:
2.4 * 7.071 = 16.97 miles without obstructions.
Maybe others have a better, more accurate or easier method of obtaining
the answer?? Good luck and happy holidays.
Gene Ferguson, W4FWG
Fairfield, KY
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w9mwq wrote:
>Keep the roar down, but am trying to figure what one would expect
>the distance of a 440 repeater to be with 20 watts out, into a
>Diamond Antenna up 50' fed by 7/8" hardline, 6 DBi of gain.
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>The user on the other end is using a base antenna, not sure of type,
>but about 50' and cannot hear the repeater. In my mobile I can hear
>it for about 10 miles and then it's super noisy then gone.
>
>Any way yo figure what one should have expected?
>
>Mathew
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>Yahoo! Groups Links
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