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RF Power vs Distance?
I was wondering if there is a guideline for figuring out the distance covered by a certain amount of RF power? I'm talking about VHF and UHF frequencies, as used by 2 way radios.
I know there are a lot of factors that affect it, I'm just looking for a general guideline.
For example, If I have a 25 Watt transmitter, would a receiver 25 Km away be able to pick up the signal?
2 Answers
- ?Lv 41 decade agoFavorite Answer
In general, assuming that the EM radiation is emitted isotropically (that is, with the same power in every direction), then the power decreases as the square of the distance from the source. For example, if you know the power at some distance from the transmitter, then the power twice as far will be one-fourth the power from the original distance.
- Anonymous5 years ago
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