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4

Consider an unmodulated carrier. It has a phase that increases with time at some constant rate. The rate that phase increases is what we call the frequency. What if the frequency isn't constant, but a function of time $\omega(t)$? If the frequency goes higher, phase increases faster. A lower frequency is a slower frequency increase. The phase at any given ...

2

FM and PM are almost identical; the answer is yes. PM is limited in phase deviation, FM is not. The audio frequency response is different: PM received on a(n) FM receiver lacks lower audio frequencies due to the (apparent) differentiation of the frequency modulation. In a formula: FM audio equals the actual deviation of the frequency; PM audio equals the ...

1

FYI C4FM is not allowed below 29 Mhz. This is because it is a wide band modulation and uses more than the allowable bandwidth for HF band transmission. Straight FM is not allowed below 29 Mhz for the same reason.

-3

I'm amazed at how many people can't ever answer this question. If you keep these things in mind you should be able to understand the difference between AM, SSB & FM Remember that humans need two components to make sound, intelligible: frequency,and volume. A "narrower channel" does not correlate to the efficiency that people ascribe to SSB. SSB ...

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