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RF transmission through the air relating signal loss

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johnyaya

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Is there a rule-of-thumb regarding an RF transmission through the air (line-of-site, no obstructions) relating signal loss (-db) to distance (km) as a function of wavelength?
Does this number change for FM, AM, ASK, etc.?

Thanks much.
 

bastos4321

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Attenuation in free space

Ao=-20*log10(c/(4*pi*F*d))

F - Frequency
d - distance
c - speed of ligth

It does not depend on the type of modulation.

Regards bastos
 

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