Orban 8182A Operating Manual page 41

If
the reading
is
too high with the
INPUT ATTEN
fully
CCW,
and the input
pads
on
Cards
#3TX
and
#4TX
in
the
Main Chassis are strapped
for
OdB
attenuation, restrap the
pads
for
20dB
attenuation.)
Turn
the
Main
Chassis
LEFT
OUTPUT ATTEN
fully
counterclockwise.
Turn
on
the aural transmitter,
and advance
the
Main
Chassis
LEFT
OUTPUT ATTEN
until your
TV
stereo
monitor
indicates a
L+R
modulation of
30%. Record
the
reading of the
Main
Chassis
L
SYSTEM OUT
meter.
Disconnect
the oscillator
from
the
LEFT
Accessory
Chassis
input,
and
connect
it
to the
RIGHT
Accessory
Chassis input.
The
TOTAL MASTER
G/R
meter
should
still
read
"0".
Connect
the output of the
RIGHT
STL
receiver to the
RIGHT INPUT
of the
OPTIMOD-TV
Main
Chassis.
Place
the
VU
meter
FUNCTION
switch
in
R
COMPR
OUT.
Adjust
the
RIGHT INPUT
ATTEN
on the
OPTIMOD-TV
Main
Chassis
to
make
the
VU
meter
read
100%.
[NOTE:
The instructions
immediately below
apply only
if
the output
amplifiers are
strapped
in
L/R mode
--
see
(4)
in
Initialization
Options
in
Part
3 (Installation).
If
the output amplifiers are strapped
in
L+R/L-R mode
and
tone
is
applied to only
one input channel of the
8182A,
first
set
L+R
modulation
to
30%
by adjusting
the
L+R
OUTPUT
ATTEN. Then
optimize
separation by
observing
the undriven
channel on your stereo
monitor and
adjusting the
L-R
OUTPUT ATTEN
until the
undriven channel
nulls.]
Advance
the
Main Chassis
RIGHT
OUTPUT ATTEN
control until
your
TV
Stereo Monitor
indicates a
L+R
modulation of
30%.
Check
the reading of the
Main
Chassis
R SYSTEM OUT
meter.
It
should be
very close
to
the reading obtained on the
L
SYSTEM OUT
meter immediately
above.
If
not,
there
is
a left/right
gain
imbalance
in
the
system beyond
OPTIMOD-TV
which should be corrected.
(NOTE:
The
"30%
modulation"
figure
is
somewhat
arbitrary, as the
appropriate
figure will
depend upon
the
overshoot
performance
of the
lowpass
filters
within the external stereo generator,
upon
the
time constant of the
peak
flasher
in
the
stereo monitor,
and upon whether
the
external stereo
generator
is
being used with or without
its
internal
preemphasis.
If
the stereo
generator's
internal
preemphasis
is
not used,
modulation
is
better controlled
and
a higher
percentage
of
modulation can be chosen
when
aligning with a
1kHz
tone
in
the
procedure above.
The "30%
modulation" figure
must
therefore
be modified
in
your individual
installation
according to
experience.)
3.b)
Mono
Installation Only:
Continue to drive the
LEFT
Accessory Chassis input
with
a
1kHz
tone
at a
level
which produces
a
"0"
reading
on the
TOTAL
MASTER
G/R
meter.
Connect
the output
of
the
STL
receiver
to the
LEFT
AND
RIGHT
INPUTS
of the
OPTIMOD-TV Main
Chassis
in
parallel.
Place the
VU
meter
FUNCTION
switch
in
L
COMPR
OUT.
Adjust the
LEFT INPUT
ATTEN
on
the
OPTIMOD-TV
Main Chassis
to
make
the
VU
meter
read
100%.
Then
place
the
VU
meter
FUNCTION SWITCH
in
R
COMPR
OUT
and adjust
the
RIGHT INPUT ATTEN
on
the
Main
Chassis
to
make
the
VU
meter
read
100
%.
4-3