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If the range of a VHF signal needs to be increased from 50 NM to 100 NM, the power of a transmitter needs to be increased by a factor of…

Power required is proportional to its range squared: P = R2

  • The practical effect of this is that if it is required to double the effective range of a transmitter then the power would have to be increased by a factor of 4. Likewise, when the distance is reduced by half, the signal becomes 4 times as strong.

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