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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
378
there is a frequency equal to that of b plus that of a is not at all
obvious, but its existence can be shown mathematically, or by actual
experiment—picking it out from the rest by tuning a sharply
resonant circuit to it.
The purpose of the local oscillator can now be seen as a means of
varying the conductance of a part of a circuit carrying the incoming
signal, amplitude-modulating it and thereby creating signals of at
least two new frequencies.
Either of these could be chosen as the i.f. in a superhet, but the
lower or difference frequency is the one usually favoured, because it
is easier to get the desired amplification and selectivit ...
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Publisher Resources

ISBN: 9781483105574