Orban 8182A Operating Manual page 45

d)
Stereo Installation Only: Place
the console
in
STEREO
mode. Observe
the
TOTAL MODULATION
meter
and peak
flasher on
your Aural
Modulation
Monitor.
If
you
wish
to adjust
peak modulation
levels, this
must
be done by
adjusting the
8182A's
LEFT
and
RIGHT
OUTPUT ATTENUATORS
-
NOT
by
adjusting
the stereo generator's
COMPOSITE OUTPUT ATTENUATOR.
Adjustment
of the
latter
control
will
destroy the tightly-controlled
relationship
between
deviation and control voltages within the stereo generator's dbx
noise
reduction encoder, compromising separation
at the receiver.
Mono
Installation
Only: Observe
the
TOTAL MODULATION
meter and peak
flasher on
your Aural Modulation
Monitor.
Assuming
that the
OPTIMOD-TV
LEFT
OUTPUT
is
driving the aural exciter,
make
slight
adjustments
to the
LEFT
OUTPUT ATTEN
as necessary to
achieve
desired
modulation
levels.
As
in
the step above, either load
both
outputs
with
equal
impedances
or
temporarily disconnect both outputs
from
the system.
Connect
a sensitive
AC
voltmeter from
the
(+)
LEFT OUTPUT
to the
(+)
RIGHT OUTPUT,
and
adjust
the
OPTIMOD-TV RIGHT OUTPUT ATTEN
until
the
meter
nulls.
Reconnect
the
outputs
to
the
system
as
necessary.
e)
Listen
to
the audio quality
of
the
air
sound on
a
good monitor system, and
verify that
it
sounds
natural
and
free
from noise and
distortion.
Comparing
"AIR" and
"PROGRAM"
should reveal very
little
difference
in
tonal
balance
due
to
the
quasi-wideband
operation
of
OPTIMOD-TV
as initially set up.
f)
You may now
proceed
to
Part 5 (Operating
Instructions) of this
Manual, and
adjust
OPTIMOD-TV
's
setup controls to
your specific requirements and
tastes.
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