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35
Selection
and Operation
of Wireless Microphone Systems
C HAPTER 3
Wireless System Operation
OPERATION OF WIRELESS
SYSTEMS OUTSIDE OF THE U
.S.
Allocation and regulation of radio frequencies is
supervised by specific government agencies in each
country, with the result that allowable (legal)
frequencies and frequency bands differ from country to
country. In addition to frequency, these agencies
typically specify other aspects of the equipment itself.
They include: allowable transmitter power, maximum
deviation (for FM), spurious emissions, etc. These
specifications may differ from one band to another and
may further differ from one type of user to another with-
in the same band. For this reason, it is not possible to
select a specific frequency or even frequency band that
is (legally) useable in all parts of the world.
Furthermore, it is not possible to design a single type of
wireless equipment that will satisfy the specifications of
all or even most of these agencies around the globe.
Figure 3-16: international wireless frequencies