Figure 6.
A synthesizing circuit using the heterodyne method.
1-8.
WHY SYNTHESIZED OUTPUT
SIGNALS
ten percent variation in the radio
MUST BE STABILIZED
channel output frequency band on one
system can cause interference on some
a. As we said in paragraph 1, the
channels being transmitted by another
signals used in communication systems
system.
must be exact and stable.
Any
variations
in
the
frequency
b. Since
synthesizing
circuits
transmitted by one system can cause
produce
signals
for
communication
interference on another system.
For
systems,
at
least
one
of
the
example, it is common practice to
synthesizing circuit oscillators must
transmit
several
hundred
telephone
be very accurate. The most common and
channels over one radio channel. A
most accurate frequency controlling
327 L1
7
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