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OPTIMOD
If you are using Orban 464A Co-Operator
If the STL uses pre-emphasis, its input pre-emphasis network will probably
introduce overshoots that will increase peak modulation without any increase
in average modulation. We therefore strongly recommend that the STL trans-
mitter'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, then 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.
Remove all screws holding the 464A's cover in place, then lift it off.
A)
B)
Refer to Figure 2-6.
Place jumper A in the "OPERATE" position.
a)
If you have defeated the STL transmitter's pre-emphasis, place jumpers B and C
b)
in the "PRE-EMPHASIZED" position.
If you cannot defeat the STL transmitter's pre-emphasis, place jumpers B and C
c)
in the "FLAT" position.
Replace the top cover, then replace all screws snugly. (Be careful not to strip the
C)
threads by fastening the screws too tightly.)
2. Install the 464A in the rack. Connect the 464A's audio input and output.
Refer to the 464A Operating Manual if you require information about installa-
tion, audio input and output connections to the 464A.
3. Calibrate the 464A's output level and Peak Output Level meters.
There is no quick way to calibrate the 464A's output level and
OUTPUT LEVEL
an accurate indication of program peaks, calibration may be achieved quickly
and precisely using program material following the procedures detailed in this
step.
If you wish to use tone to calibrate the 464A's output level and
OUTPUT LEVEL
page 2-10, steps 10 and 11. Repeat for the right channel. Note that this proce-
dure instructs you to calibrate the 464A's meters to indicate +3dB for 100%
modulation of the STL. However, you may wish to calibrate them to indicate
0dB for 100% modulation of the STL. Just be consistent in steps 10 and 11.
meters using a tone. If your STL has input meters that give
meters, follow the procedure in the 464A Operating Manual,
2-17
INSTALLATION
PEAK
PEAK
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