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2-10
INSTALLATION
Orban Model
464A
b)
Place
jumpers
B
and
C
in
the
"PRE-EMPHASIZED"
position (see
Fig. 2-1).
If
the
transmitter's
pre-emphasis cannot be
defeated, place these
jumpers
in
the
"FLAT'
position.
5)
Increase
clipping.
(optional)
The
Co-Operator
is
shipped with
the clipper adjusted
to
produce
no
audible
dis-
tortion
even
on
the
most
unusual
program
material.
It is
possible
to increase
average
modulation
about
2dB
by
reducing
clipper
bias.
Such
an adjustment
will,
however,
introduce very
slight
audible
distortion
on
some
uncommon
program
material.
To
reduce
clipper
bias,
turn
CLIPPER BIAS trimmer
R2
fully
counterclockwise.
NOTE:
If
you
readjust
this
trimmer
in the
future,
you must
also recalibrate
the
Co-Operator's
clipping
level (see step
11).
6)
Replace
the top
cover.
Replace
all
screws snugly
(be careful not
to strip
the threads
by
fastening the
screws
too
tightly).
7)
Mount
the
Co-Operator
in
a
rack.
See page
2-4.
Be
sure
to verify
a
good ground
connection
between
the
Co-Operator
and
the
rack.
8)
Connect
audio
input
and
output.
See page
2-4.
9)
Connect
power.
See page
2-4.
10)
Calibrate
the
l
peak output
level
meter.
a)
Connect an
audio
sine
wave
generator
to
the
LEFT
IN
terminals.
Set frequency
to
400Hz
and
amplitude
to
approximately
+10dBu
(2.45V
RMS).
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