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LEFT
1.14NT
OUTPUT
ovriva.
041TNT ATTU..
00
Oln
EH%PPED
H E RH
Si
OUT
OUT
54
LEFT
it,G117
Pe-emPriPS,S
DE-E
,
APNASP.
JUP.Pelt
30APtP
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 - 10dBm)
are
present,
the
pads
must
be
defeated.
To
do this, remove Cards # 3 and # 4.
Reposition the jumper
straps
according to Fig. 3-3.
'
• *
4-
1
• •
• '• •
T T
®7
;
JumPta
u4PUIPTIFJ4
O
( J. •., p'oPtP1
o
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 1.b and
1.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-FR/L-R.)
3-3
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