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2-12
INSTALLATION
Orban Model
464A
be between 13.5% and 16.5%
modulation.
It is
normal
for these
levels
to
vary
±ldB
from
unit to
unit
c)
For
stereo transmission,
reduce
the
OUTPUT ATTEN
control
settings to
avoid
peak
over-modulation caused
by
overshoots
in
the transmitter's
15kHz
audio
low-pass
filter
on
certain signals
with
substantial
high-frequency
content.
12)
Set
controls
for
normal
operation
with
program
material.
The
Co-Operator can be used
for transmitter
protection
only,
or
it
can be used
for
transmitter protection
and
level control.
For
FM
broadcast,
we
recommend
both
level control
and
transmitter protection for
talk,
popular music,
light classics,
rock,
and
similar formats.
Level
control
may
not
be
desirable in
some
situations,
such
as
with
classical
music
intended
for serious
listening.
The
following
assumes
that
a
VU
meter
is
used
to
determine
line
drive levels
with
program
material.
a)
Set
controls as follows:
For
transmitter protection
AND
level
control:
L
METER CAL
L
HF
LIMIT
PRE-EMPHASIS
L
OUTPUT
ATTEN
L
GATE THRESH
L
RELEASE
TIME
L
REL
SHAPE
L
LEVEL
L
COMPR
L
HF
LIMIT
L
SYSTEM
MODE
Do
not
change
75us*
Do
not
change
5
5
SOFT
ON
OFF
OPERATE
OPERATE
DUAL**
For
transmitter protection
ONLY:
L
METER
CAL
L
HF
LIMIT
PRE-EMPHASIS
L
OUTPUT
ATTEN
L
GATE THRESH
L
RELEASE
TIME
L
REL
SHAPE
L
LEVEL
L
COMPR
L
HF
LIMIT
L
SYSTEM
MODE
Do
not
change
75us*
Do
not
change
0
0
HARD
OFF
ON
OPERATE
OPERATE
DUAL**
*
Or
to
match
the
pre-emphasis
of
the
transmission system.
**
For
stereo, set
mode
to
stereo
after
set-up
is
complete.
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