OPTIMOD-FM INSTALLATION
2-17
We recommend 8-15 dB gain reduction for most formats.
If you are using Orban 464A Co-Operator
JUMPER A: CLIPPER
DEFEAT OPERATE
JUMPER B: LEFT OUTPUT
JUMPER C: RIGHT OUTPUT
FLAT
FLAT
PRE–EMPHASIZED
PRE–EMPHASIZED
Fig. 2-5: 464A Jumper Settings
If the STL uses pre-emphasis, its input pre-emphasis network will probably in-
troduce overshoots that will increase peak modulation without any increase in
average modulation. We therefore strongly recommend that the STL transmit-
ter’s pre-emphasis be defeated (freeing the STL from such potential over-
shoot), and that the 464A be used to provide the necessary pre-emphasis.
If the STL transmitter’s pre-emphasis cannot be defeated, configure the 464A
for flat output. In this case average modulation levels of the STL may have to
be reduced to accommodate the overshoots.
1. Configure the 464A’s internal jumpers.
A) Remove all screws holding the 464A’s cover in place, and then lift it off.
B) Refer to Fig. 2-5.
a) Place jumper A in the “OPERATE” position.
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