Orban OPTIMOD-FM 8700, Operating Manual

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INTRODUCTION ORBAN MODEL 8700i
Flexible Configuration

OPTIMOD-FM 8700i is supplied with analog and AES3 digital inputs and outputs.
The digital input and the two digital outputs are equipped with sample-rate
converters and can operate at 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz, and 96 kHz
sample rates. The preemphasis status and output levels are separately adjustable
for the analog and digital outputs. Each output can emit the analog FM pro-
cessed signal, the analog FM processed signal with diversity delay applied, the
digital radio processed signal, or the low-delay monitor signal.

A loop-through connection is provided to enable a ratings encoder (such as Niel-
sen Audio®) to be embedded in the audio processing. (See
Connecting a Ratings
Encoder on page 2-8.)

The 8700i has two independent equalizers, multiband compressors, and peak lim-
iters for the FM analog and digital media processing channels, allowing you to
separately optimize the processing for each.

A Low-Delay Monitor Processor, intended for driving talent headphones, oper-
ates in parallel with the main audio processing. It includes an adjustable distor-
tion-cancelled clipper, allowing you to dial in “FM limiter sound” when desired
by talent. Its delay is approximately 5 ms.

An AES11 sync input allows you to synchronize the output sample rate of either
(or both) AES3 outputs to this input. You can also synchronize the outputs to the
AES3 digital input or to 8700i’s internal clock. The sync source of each AES3 out-
put is independently selectable.

A defeatable diversity delay can delay the FM analog processing output up to
16.2 seconds. Delay can be trimmed in intervals of one sample of 64 kHz to
match the analog and digital paths in the HD Radio system, eliminating the need
to use the delay built into the HD Radio exciter and permitting the 8700i’s inter-
nal stereo encoder and composite limiter to drive the analog FM exciter. Each
output (Analog, Digital 1, Digital 2, Composite) can be independently configured
to emit the delayed or undelayed signal.

Built-in RDS/RBDS generator.

The analog inputs are transformerless, balanced 10k

instrumentation-amplifier
circuits. The analog outputs are transformerless balanced and floating (with 50

impedance) to ensure highest transparency and accurate pulse response.

The 8700i has two independent composite baseband outputs with digitally pro-
grammable output levels. Robust line drivers enable them to drive 100 feet of
RG-59 coaxial cable without audible performance degradation.