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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 ...


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 ...


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.


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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