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Co-Operator
INSTALLATION
2-9
Installation
—
FM
Transmitter,
STL,
Subcarrier
Generator
Protection
If
you
are not using
the
Co-Operator
to
protect
an
FM
transmitter, studio-transmitter
link
(STL),
or
subcarrier generator,
follow
the installation instructions
which
begin
on page
2-2
—
the
following
does
not apply
to
you.
Allow
about
45
minutes
for
installation
and
set-up.
You
will
need an
audio
sine
wave
generator.
If
you do
not
have
a
modulation
monitor,
you
will also
need an
audio voltmeter.
Installation
includes
unpacking and
inspecting the
Co-Operator,
setting
of
clipper-
defeat
and
pre-emphasis jumpers,
mounting
the
Co-Operator
in
a
rack,
then connect-
ing
it
to
audio input
and
output,
power, and ground.
Transmitter
protection set-up
consists
of
defeating
your
transmitter's
pre-emphasis,
adjusting the
Co-Operator's
clipping
bias,
calibrating
its
PEAK OUTPUT LEVEL
meters and
clipping
level,
then
setting
controls for
normal
operation.
An
optional security
cover can be
installed to
protect control
settings.
1)
Defeat your
transmitter's
pre-emphasis.
The
transmitter's
pre-emphasis
network
will
probably
introduce overshoots
that
will
increase
peak modulation
without
any
increase
in
average modulation.
We
therefore strongly
recommend
that
the
transmitter's
pre-emphasis be defeated
(freeing the transmitter
from
such
potential overshoot),
and
that
the
Co-Operator
be used
to
provide
the
necessary pre-emphasis.
If
the
transmitter's
pre-emphasis cannot
be
defeated,
then configure
the
Co-
Operator
for
flat
output
In
this
case average
modulation
levels
may
have
to
be reduced
to
accommodate
the overshoots.
2)
Unpack and
inspect the
Co-Operator.
See page
2-2.
3)
Remove
the top cover.
Remove
all
screws holding
the
cover
in place,
then
lift
it
off.
4)
Reposition clipper-defeat
and
pre-emphasis
jumpers.
a)
Place
jumper
A
in
the
"OPERATE"
position
(see Fig. 2-1).
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