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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
CHAPTER 20
Selectivity and Tuning
20.1 Need for R.F. Amplification
In Sec. 18.11 we saw how the effectiveness of detectors deteriorates
quite rapidly as the r.f. input is reduced much below about 1 V.
Signals picked up by a receiving antenna are seldom more than a few
millivolts and are often only microvolts, so (except from a powerful
sender at short range) they are too weak to operate a detector
satisfactorily. Amplification of the r.f. signals is therefore a
practical necessity in order to give a receiver adequate sensitivity,
which, for an a.m. sound receiver, is usually expressed as the input
microvoltage needed to yield a specified a.f ...
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Publisher Resources

ISBN: 9781483105574