Are FM waves infinite?

Question

I dont know how to word my question but here is my best attempt.

Does the signal strength of FM transmission fade if the number of consumers increase ?

Is the assumption that FM waves are similar to electricity in the sense that it has to be produced enough to be consumed by receivers correct ?

Answer 1

Does the signal strength of FM transmission fade if the number of consumers increase ?

Not in any 'normal' situation. It's barely possible that if an FM transmitter were surrounded by a very dense population of users that were all using their own big aerials and they lived in tiny boxes stacked side-by-side and on top of one another that the aerials would act like a big reflector array and attenuate the signal on the other side for a short distance.

It's also possible that as the density of listeners increases in an area the amount of interference that all their other electronic gear creates increases (very very small effect on FM compared with natural fading due to reflection of hills and in different layers in the atmosphere).

Is the assumption that FM waves are similar to electricity in the sense that it has to be produced enough to be consumed by receivers correct ? - No. Your aerial picks up only a very small voltage, having hardly any effect on the field at all, your FM receiver then uses a whole lot of electricity supplied by the mains or batteries to amplify that signal, demodulate it, amplify the audio so you can hear it and run all the flashy lights and dingetjes.

The FM transmitter just needs to put out enough power that the ratio of signal strength to noise and other interference in the same frequency band is low enough, at the most difficult to reach place you are interested in reaching, that a fairly cheap FM receiver with a small antenna can autotune to it almost all of the time.

Best of Luck - Mike

Answer 2

No, *no*, *NO*!!! FM waves are the same as any other modulated electromagnetic waves (AM or PM). FM (and PM) do, intheory, have an infinite number of sidebands (as opposed to AM which has only one sideband pair for each frequency being modulated on it) but, aside from that, they don't get diminished in any way by more or less users.


Doug

Answer 3

If a service has a frequency of a hundred Hz. then it has NO bandwidth, in any respect, merely radiating at a hundred Hz. IF a modulating sign (f mod) is utilized to this service wave, then it is going to selection as much as f (vehicle) + 2f (mod) and an style of wierd harmonics. take a glance at "Bissel purposes" which clarify the goods of frequency modulation.

Answer 4

Nope

Answer 5

NO-modulated.