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audioguru

Well-Known Member
Most Helpful Member
A low frequency like 1MHz for an AM radio bounces off the ionosphere so it goes pretty far around the world.
Higher frequencies like 100MHz for an FM radio go straight without bouncing and the curve of the earth prevents a far range.
 

bhavesh03

New Member
thanks Uncle $crooge.
has it not got anything do with skin effect or attenuation/noise in the signal?
please explain
 

Boncuk

New Member
The frequency also determines if the RF signal follows the curvature of the earth or travels at a line of sight.

The higher the frequency the more straight the waves move. (Compare FM radio with medium wave radio.)

Boncuk
 

bhavesh03

New Member
No.
Just the frequency determines if the signal bounces off the ionosphere or not.
what if we don't associate it with ionosphere and then relate frequency and range of signal???????
because i hav read somewhere that higher the frequency, higher is the noise/attenuation and skin effect factors and thus reducing the range of signal.
please tell me in detail.
 

Reloadron

Well-Known Member
Most Helpful Member
why range of a signal decreases with increase in frequency?

First, if you are talking about radio wave propagation I would suggest that you read this link and then go ahead and read this link.

You will find those links explain in detail exactly what Audio Guru and Boncuk have already told you. It is exactly as they explained.

what if we don't associate it with ionosphere and then relate frequency and range of signal???????
because i hav read somewhere that higher the frequency, higher is the noise/attenuation and skin effect factors and thus reducing the range of signal.
please tell me in detail.


When you mention frequency and range of signal you have to associate it first with the ionosphere. Then you can worry about other forces that can effect wave propagation. The links also cover those in detail.

I hope that helps.

Ron
 
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