Studio Level Controller Installation (Optional); If You Are Using Orban 8200St External Agc - Orban Optimod-FM 8300 Operating Manual

OPTIMOD-FM DIGITAL
rightmost meters indicate the gain reduction in the two-band high fre-
quency limiter.

Multiplex Power / HD Gain Reduction meter is switchable via the M
F control in S
UNCTION
the ITU412 Multiplex Power controller. It shows how much the MPX Power Con-
troller has reduced the clipper drive, thereby reducing the average power in the
processed audio. It will show no gain reduction unless the MPX Power Controller
is turned on. In HD GR mode, the meter indicates the larger of the gain reduc-
tions in the left and right channel look-ahead limiters for the HD Radio / digital
radio / netcast processing chain.

Composite meter shows the output level of the stereo encoder before
the composite output attenuators. The meter's reading is calibrated in
percent modulation.

Studio Level Controller Installation (optional)

[Skip this section if you are not using a studio level controller ahead of the 8300.
Continue with "Quick Setup" on page 2-16.]

As of this writing, the currently manufactured Orban products that can be used
as external AGCs are Optimod-PC 1101 and Optimod 6300. Their manuals con-
tain instructions on how to use them in this application. They are the preferred
choices because their AGCs are identical to the AGC in the 8300.

Discontinued Orban products usable as external AGCs include the 8200ST, 464A
"Co-Operator," 8100AST, and 1100 OPTIMOD-PC. In this manual, we do not pro-
vide step-by-step instructions for setting up all of these older products, although
it should be easy to extrapolate from the instructions we do provide.
If you are using an Orban 8100AST (or 8100A/ST) external AGC, refer to page 1-16.

If you are using Orban 8200ST external AGC

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 transmitter's pre-
emphasis be defeated (freeing the STL from such potential overshoot), and that the
8200ST be used to provide the necessary pre-emphasis.
If the STL transmitter's pre-emphasis cannot be defeated, then configure the 8200ST
for flat output. In this case average modulation levels of the STL may have to be re-
duced to accommodate the overshoots.
8. Configure the 8200ST's internal jumpers.
A) Remove all screws holding the 8200ST's cover in place; then lift it off.
. In M P
ETUP ULTIPLEX OWER
mode, it indicates the action of
2-13
INSTALLATION
ETER