Studio Technologies 5120 2011 - Manual (Page 5)

Model 5120 User Guide Issue 3, November 2011
Studio Technologies, Inc. Page 5
Model 5120
Line/IFB Output Module
Introduction
The Model 5120 Line/IFB Output Module is
a compact, self-contained 2-channel mod-
ule intended for use in custom broadcast,
live-performance, and other specialized
audio applications. The module provides
broadcast and production talent cueing
interfaces, specifically two line-level (“dry”)
and one IFB (“wet”) outputs, in an easy-to-
use yet technically sophisticated package.
(Note that IFB is an acronym for Interrupt-
ed Fold Back, an arcane broadcast tech-
nical term meaning the cue signals sent
to on-air talent or other technical support
personnel.) The module’s basic functions
include selectable analog and digital audio
inputs, input level and status LED indica-
tors, two analog line-level outputs, and a
2-channel DC-biased (“wet”) broadcast-
standard IFB output. Module operation
requires only a source of analog or digital
audio, along with an externally-provided
source of 12 volts DC.
Applications for the Model 5120 include
sports broadcasting booth packages,
remote news gathering “fly-packs,” stadium
audio/video interface (I/O) locations, and
other broadcast-infrastructure projects.
The number of Model 5120 modules used
in a project can vary widely—from one to
dozens. In each case the Model 5120’s
performance will be completely “pro” with
audio quality, reliability, and installation
flexibility matching that of larger-scale
audio consoles, matrix intercom systems,
and stand-alone IFB systems. Typical
applications will find the Model 5120’s
analog and digital inputs being inter-
faced with outputs provided by fiber-optic
transport modules, audio/video routers,
broadcast/production consoles, and matrix
intercom systems.
The Model 5120’s line-level outputs would
typically be connected to battery-powered
listen-only headphone amplifiers, amplified
speakers, or inputs on broadcast media
storage systems. In remote-broadcast
applications these two outputs may be
referred to as “dry” (no DC voltage present)
IFB signals. The Model 5120’s IFB output
is directly compatible with listen-only por-
table IFB amplifiers, such as the Models
32A, 33A, or 34A from Studio Technolo-
gies, Inc. The 2-channel IFB output pro-
vides signal common on one pin, +28 volt
DC power with superimposed analog audio
on a second pin, and analog audio only on
a third pin. This complies with a long-popu-
lar broadcast-standard implementation.
Figure 1. Model 5120S Line/IFB Output Module front and back views