Orban OPTIMOD-FM 8600Si, Operating Manual

Page: 37 / 356

OPTIMOD-FM DIGITAL INTRODUCTION
1-11
fine the amount of reduction in percent using the procedure in step 2 on page 2-23.
See page 2-45 for information on programming the remote control.
A jumper (J6) on the circuit board can reconfigure the SCA 2 input to provide the
stereo pilot tone only, which can provide a pilot reference for an RDS subcarrier
generator.
Remote Control Interface
The Remote Control Interface is a set of eight optically-isolated GPI inputs on a DB-
25 connector, which can be activated by 5-12V DC. They can control various func-
tions of the 8600Si:
•
Recall any Factory Preset, User Preset, Test Mode state (Bypass or Tone), or exit
from a Test Mode to the previous processing preset.
•
Switch the stereo encoder to stereo, mono from left, mono from right, or mono
from sum audio input. This also determines the feed to the entire processing
chain so that facilities that do not use the 8600Si’s stereo encoder can change
stereo/mono mode and select the source when in mono mode.
•
Switch the 8600Si to use either the analog input or the digital input.
•
Mute any output configured to emit the low-delay monitor signal.
•
Independently activate and defeat the diversity delay applied to the analog, digi-
tal, and composite outputs.
•
Reduce the stereo main and subchannel modulation to compensate for transmit-
ter overshoot and subcarrier inputs (SCAs).
The remote control of overshoot compensation and SCA modulation (see
page 2-45) is not latching. You must supply a continuous current to the
programmed remote input to hold the gain at its compensated level. Use
the status outputs of your transmitter and/or SCA generators to provide
the switching signal so the compensation will automatically follow the
transmitter and/or subcarrier generator on the air.
•
Reset the 8600Si’s internal clock to the nearest hour or to midnight.
The tally outputs can be programmed to indicate the following:
•
Input: Analog: Indicates that the 8600Si is processing audio from its analog input.
•
Input: Digital: Indicates that the 8600Si is processing audio from its AES3 digital
input.
•
Analog Input Silent: Indicates that the level at either or both analog input chan-
nels is below the threshold set in step (A) on page 2-25.
•
AES Input Silent: Indicates that the level at either or both digital input channels
is below the threshold set in step in step (A) on page 2-25.