Most of the chapters of this book are about subjects the usefulness of
which, taken by themselves, might not be at all obvious.
Proverbially, one might not be able to see the wood for the trees. So
before examining these things in detail we may find it helpful to take
a general view of a complete electronic system. The choice is a
broadcasting and receiving system, because it is so familiar in
everyday life and it happens to embody most of the principles of
electronics.
1.1 What Wireless Does
People who remark on the wonders of wireless seldom seem to
consider the fact that all normal persons can broadcast
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