THE LOWEST CARRIER FREQUENCY
The carrier wave itself must have a frequency far higher than the highest video frequency, otherwise, the shape of the modulation would not be clearly reflected in the modulated carrier. This will be clear from Fig. 30.17.
With a carrier frequency of at least five times as great as the modulation frequency, the modulation shape finds clear expression in the modulated carrier, Fig. 30.17 (a). On the other hand, when carrier frequency is only twice modulation frequency, it is scarcely possible to recognise the shape of the modulation, as shown in Fig. 30.17 (b).
The carrier frequency chosen is, in practice, at least five times as great as the modulation frequency. For television, carrier waves must be used with a frequency ...
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