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LEFT
RAWVT
OOTFUT
ATTtKi.
OUTTW
ATTfcH
Fig. 3-2:
CARD
#7:
OUTPUT
PREEMPHASIS
JUMPER
2)
Input Attenuator Pads:
OPTIMOD-TV
is
shipped with
20dB
pads ahead
of
the
input
buffer amplifiers.
These
are located
on
Card
//3
(left
channel)
and
Card
#4
(right channel),
and
are suited
for
nominal
input levels
from
-10
to
+10dBm.
If
lower
input
levels
(from
-30
to
-IDdBm)
are
present,
the
pads
must
be
defeated.
To
do
this,
remove
Cards
f/3
and
#4.
Reposition the
jumper
straps
according
to Fig.
3-3.
Fig. 3-3:
CARDS
//
3
AND
#4
INPUT
ATTENUATOR
JUMPERS
3)
Defeating The
30Hz
Highpass
Filters:
There
is
no jumper
plug
for
defeating
these
filters
because
we
feel
that
the
overall
broadcast
system
will
work
better
with
the
filters
operative
for
reasons discussed
in
detail
in
paragraphs
l.b
and
l.c
of
Appendix
A.
Some may
disagree.
Those
who
wish
to defeat the
filters
can
do
so
by
soldering
a
jumper
wire
between
pins
3
and
7 of
IC302
(Card
#3)
and IC402 (Card
#4).
4)
L/R Or L+R/L-R
Output Mode:
OPTIMOD-TV
is
shipped with the feed
to
the
line amplifiers
in
the
L/R mode
(i.e.,
the
two
line
amplifier outputs represent
the
left
and
right
channels).
If
you
are
operating
in
mono,
leave
the
line
amplifiers
in
L/R
mode.
If
you
are operating
in
stereo,
you can
strap the
line
amplifiers
to
produce
L/R
or
sum-and-difference (L+R/L-R)
outputs
as
required
by your
installation.
(If
the
Orban 8182A/SG
Stereo
Generator
is
in
use,
the
outputs
must
be strapped
for
L+R/L-R.)
3-3
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