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Disconnect
the
oscillator
from
the
LEFT OPTIMOD-TV
input,
and connect
it
to
the
RIGHT
input.
The
TOTAL MASTER
G/R
meter
should
still
read
"0".
Advance
the
RIGHT
OUTPUT ATTEN
control
until
your
TV
Stereo Monitor
indicates
a
L+R
modulation
of
30%.
Check
the reading
of the
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
after
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.)
2.b)
Mono
Installation
Only:
Connect
an audio
oscillator
to
the
LEFT INPUT
of
OPTIMOD-TV.
Set
its
frequency
to
1kHz, and
its
output
level
to
produce
"OdB
"
+3dB
as
indicated
on
the
TOTAL MASTER
G/R
meter.
Connect
the
LEFT
OPTIMOD-TV
OUTPUT
to
the input of the aural exciter.
Turn
on
the
aural
transmitter,
and advance
the
LEFT
OUTPUT ATTEN
until
your Aural
Modulation Monitor
indicates
60%
modulation.
Turn
off
the
aural
transmitter.
Disconnect
the
oscillator
from
the
LEFT
OPTIMOD-TV
input,
and connect
it
to
the
RIGHT
input.
The
TOTAL MASTER
G/R
meter
should
still
read
"0".
Disconnect
the
LEFT OPTIMOD-TV
OUTPUT
from
the
aural exciter
input,
and
connect
the
aural
exciter
input
to
the
RIGHT OPTIMOD-TV OUTPUT.
Turn
on the aural transmitter.
Advance
the
RIGHT
OUTPUT ATTEN
control
until
your Aural
Modulation
Monitor
indicates
60%
modulation.
(See
the
NOTE
immediately
above.)
The L
SYSTEM OUT
and
R SYSTEM
OUT
meters on
the
Main
Chassis should
read
identically.
3. a)
Stereo
Installation
Only:
Connect
the
LEFT
and
RIGHT
program
lines
from
the
console
or
switcher
to
the
LEFT
and
RIGHT
inputs
of
OPTIMOD-TV.
Proceed
to
Program
Tests below.
3.b)
Mono
Installation Only:
Connect
the
program
line
to
both
LEFT
and
RIGHT
OPTIMOD-TV
inputs
in
parallel.
If
your
installation
is
fully
redundant,
you
may
wish
to
connect
a
redundant
audio source
to
the
RIGHT INPUT
instead of paralleling.
Be
sure that
both
audio
sources are
at
the
same
level
and
are
in-phase.
Proceed
to
Program
Tests below.
4-5
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