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Assuming
you had
read the
section
on A.M.
you
would be
aware
that two
of the
disadvantages
of a.m.
transmission
are the
twice
the
bandwidth
to
convey
the same
information
and only
25% of
the
power is
used in
each
side
band.
The
remaining
50% of
power is
expended
in the
carrier.
It makes
more
sense in
terms of
economy
of
bandwidth
as well
as
economy
of power
to
simply
transmit
only one
side
band.
This is
called
S.S.B.
or
Single
Side
band.
Depending
upon
which
side
band is
chosen
to
transmit
one is
called
upper
side
band and
the
other is
called
lower
side
band. In
amateur
radio,
conventions
exist as
to which
side
band is
transmitted
in a
particular
amateur
band.
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