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Does highly sensitive radio receivers encounters less fading

ofosot69

New Member
I need to know whether the radio receivers that are highly sensitive, like having sensitivity less than 0.0224 micro volts for AM reception, encounter less fading than the others with less sensitivity?

Which specification of a radio receiver is responsible for mitigating fading?
 
Fading is caused by conditions in the D, E, & F layers of the ionosphere. These conditions can absolutely drop the level of a signal to undetectable levels. Nothing you do in a receiver can overcome the complete lack of a signal. Some relief is provided by an AGC (Automatic Gain Control)circuit, but these have a finite reaction time which does not allow smooth transitions between high gain and lower gain conditions.

There is also a limit to how sensitive you can make a receiver. There is a point caleed the noise floor where the signal has less energy than the noise cause by all the different sources including the cosmic background radiation. This level is about -176 dBm. There are methods for recoveing information burried in the noise floor, but they are for digital information, not audio..
 

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