With a tone-modulated FM wave, if the modulation frequency is held constant and the modulation index is increased, the ( non-negligible ) bandwidth of the FM signal increases but the spacing between spectra remains the same; some spectral components decrease in strength as others increase.
42.
The signal aspect of the next signal is coded in modulation frequency ( there are used four modulation frequencies : 0.9 Hz 1.8 Hz 3.6 Hz 5.4 Hz; it means that it is possible to transmit four signal aspects ).
43.
The signal aspect of the next signal is coded in modulation frequency ( there are used four modulation frequencies : 0.9 Hz 1.8 Hz 3.6 Hz 5.4 Hz; it means that it is possible to transmit four signal aspects ).
44.
Enough negative bias is applied to the grid ( or " base ", for a transistor implementation ) to bring the device almost to cut-off point; an incoming signal will cause the device to conduct only on positive-going halves of the input signal . . . it cannot conduct significantly " less " during negative halves, so the plate voltage varies at the modulation frequency-going more negative as the input signal envelope increases with the Amplitude Modulation modulating signal.
