Studio Technologies 5130 2013 - Manual (Page 6)

Issue 5, July 2013 Model 5130 User Guide
Page 6 Studio Technologies, Inc.
Model 5130
Party-Line Interface Module
The 4-wire audio inputs and outputs were
carefully designed for use in permanent
as well as field applications. Filtering on
the inputs minimizes the chance that radio
frequency (RF) energy will interfere with
the audio input sources. Other components
were included to address ESD (“static”)
and DC over-voltage conditions. In addi-
tion, the DC power input is protected from
accidental polarity reversal.
For operation, the Model 5130 only re-
quires connection of analog audio inputs
and outputs, along with an external source
of nominal 12 volts DC. The acceptable
input voltage range is 10 to 18, allowing
a variety of power sources to be utilized.
Power supply circuitry within the Model
5130 creates the voltages required for the
analog and digital circuitry.
Standard connectors are used throughout
the Model 5130. The party-line intercom
interface is accessed using a 3-pin male
XLR connector. The 4-wire audio input
and output connections are made using
5-position, 0.1-inch “header” connectors.
The DC power input and data bus con-
nections use a 4-position, 0.1-inch header.
Low-cost IDC (insulation displacement)
mating connectors allow simple intercon-
nection with the audio input, audio output,
DC input, and RS-485 data signals.
For compliance with international broad-
cast audio level standards two versions of
the Model 5130 are available. The Model
5130S supports SMPTE® audio levels
where the analog audio reference level
is +4 dBu. The Model 5130E supports
applications that require European Broad-
cast Union (EBU) compliance with an
analog audio reference level of 0 dBu.
Model 5130 Party-Line Interface Modules
do not include a mounting enclosure or
chassis. They are intended for mounting
in custom 19-inch rack panels, equipment
boxes, broadcast furniture, “NEMA” I/O
boxes, or other specialized enclosures. It
is expected that integration firms will cre-
ate applications that use Model 5130
modules as part of complete broadcast,
production, corporate, and government
solutions. Sophisticated users will be
able to create “one-off” solutions to solve
unique challenges.
Party-Line Power Source
The party-line intercom power supply cir-
cuitry provides a low-noise, current-limited
source with a nominal 28 volt DC output.
Termination networks provide the required
200 ohm impedance for the audio signals
associated with the two party-line intercom
channels. With these features the Model
5130’s party-line intercom interface is es-
sentially identical to that created by stand-
alone intercom power supplies or powered
master stations.
Logic circuitry contained within the Model
5130 monitors the voltage on pin 2 for a
low-voltage/over-current condition. If de-
tected, the DC output will automatically
enter a protection mode. Once the fault
condition is removed normal operation will
again resume. The pin 2 status LED offers
the user a simple “go/no go” indication for
rapid troubleshooting.
Analog Hybrids with Auto
Nulling
The 2-wire-to-4-wire hybrids provide low
noise, low distortion, good frequency
response, and high return-loss (“nulling”),
even when presented with a wide range