f. Occupied bandwidth.
This term is defined as the frequency
bandwidth that, below its lower and above its upper frequency limits,
the mean powers radiated are equal to 0.5 percent of the total mean
power radiated by a given emission.
In some applications, for
example multichannel radio frequency division multiplex systems, the
percentage of 0.5 may lead to certain difficulties in the practical
application of the definitions of occupied and necessary bandwidth
for these, a different definition may prove useful.
LESSON 1 - EXERCISE 1
Complete items 1 through 4.
1. The units for frequency are hertz and a hertz equals one cycle
per second.
a.
True.
b.
False.
2. What
frequency
range
is
usable
and
is
controlled
by
communications-electronics frequency management?
a.
3 kilohertz to 3000 gigahertz.
b.
3 kilohertz to 300 gigahertz.
c.
3 megahertz to 300 gigahertz.
d.
3 kilohertz to 30 gigahertz.
3. One television channel occupies approximately ten times the
spectrum space required for an entire commercial amplitude modulation
broadcast band.
a.
True.
b.
False.
4. What frequency range does the commercial broadcast band operate
in?
a.
very high frequency
c.
medium frequency
b.
high frequency
d.
Check your answers with the exercise solutions on page 99.
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