Advertisement
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
lkHz 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
lkHz,
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
OPTItvIOD-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
Advertisement
