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l l )A_Radio frequency signals are often modulated by lower frequency information. The effect of this is to increase the peak amplitude of the signal whilst keeping the average amplitude the same. The depth of modulation is given by the modulation index m.
The graph below shows the time domain waveform of an RF signal F modulated by a sinusoidal signal f.3_ 5 _ 8_ 6@S, - 8 + _ 8_ , @ NormalArial
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$ $ )@Note that modulating a signal changes its RMS level as well as its peak level. This is why a field strength meter, which responds to RMS, cannot be used to set level on a modulated signal.3 5 @8 @6@S - @8 + @8 @, @ NormalArial
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' ' )@This calculation sheet has been produced by Elmac Services, Chichester, UK
http://www.elmac.co.uk
No liability is accepted for its use3 @8 @ ChrPropData 4 @z 5 @8 @6@S, - @8 + @8 @, @ NormalArial