Oct 16, 2001 #1 johnyaya Full Member level 2 Joined May 30, 2001 Messages 125 Helped 17 Reputation 34 Reaction score 0 Trophy points 1,296 Location YoyoDyne Activity points 1,106 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.
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.
Oct 17, 2001 #2 B bastos4321 Full Member level 5 Joined Dec 31, 1999 Messages 264 Helped 27 Reputation 54 Reaction score 7 Trophy points 1,298 Location space Activity points 2,238 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
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