AM-FM commercial receivers noise
时间：04-07
整理：3721RD
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hi all,
When swithcing ON a commercial FM receiver, we hear that clear noisy sound from the receiver speaker, but when changing to AM receiving, that noisy sound is not heared.
my quesions are:
1)Where is that noisy sound comming from? Is it internally generated in the receiver, or externalyy received?
2) Is it because FM section has an RF amp stage?
3) If we use RF amp stage fro AM section, will it have also that noisy sound?
4) Why AM section doesn't have that noisy sound?
5) When tuning to an FM station, that noisy sound is there any more. Why?
When swithcing ON a commercial FM receiver, we hear that clear noisy sound from the receiver speaker, but when changing to AM receiving, that noisy sound is not heared.
my quesions are:
1)Where is that noisy sound comming from? Is it internally generated in the receiver, or externalyy received?
2) Is it because FM section has an RF amp stage?
3) If we use RF amp stage fro AM section, will it have also that noisy sound?
4) Why AM section doesn't have that noisy sound?
5) When tuning to an FM station, that noisy sound is there any more. Why?
Consider signal detection of FM where limitter is used.