Studio Technologies 230 2014 - Manual (Page 10)

Issue 9, November 2014 Model 230 User Guide
Page 10 Studio Technologies, Inc.
control. All audio inputs and outputs make
extensive use of protection components.
This limits the chance of damage from
ESD and other undesirable, yet real-world,
hazards.
Power Sources
The Model 230 can derive its operating
power from an IFB circuit, an intercom
line, or an external 24 volt DC source. For
redundancy, all three power sources can
be connected simultaneously. An internal
switch-mode power supply ensures that
all Model 230 features are available, in-
cluding phantom power, when the unit is
powered by any of the three sources.
The Model 230 is compatible with IFB
circuits provided by most standard broad-
cast systems. However, maximum perfor-
mance can often be obtained by using IFB
interface devices available from Studio
Technologies. They provide high-qual-
ity audio signals along with an excellent
source of DC power. They are directly
compatible with most matrix intercom sys-
tems, as well as standard line-level audio
signals. Refer to the Studio Technologies
website for details.
Auxiliary Relay
Model 230 resources include a general-
purpose relay, allowing specialized con-
figurations to be created. Under software
control, the relay can be configured to
follow the state of the main output, talk-
back 1, or talkback 2 buttons. Taking
advantage of the back-panel locations
provided for additional XLR connectors, a
technician may easily implement a variety
of functions such as an “on-air” indicator
or performing loudspeaker muting during
talkback. Special configuration modes are
even included to allow direct control of the
relay using the talkback 1 or talkback 2
buttons without impacting any of the unit’s
audio signals.
Configuration
Model 230 configurations are made using
a number of DIP switches and four trim
potentiometers. One 8-position switch
assembly is used to set the gain of the
microphone preamplifier, the on/off sta-
tus of phantom power, and control of the
headphone output modes. A 12-position
switch assembly configures which of the
six cue audio sources are routed to the
headphone outputs. Two 8-position switch
assemblies communicate the desired
operating modes to the microprocessor.
Two rotary trim pots are used to adjust
the input sensitivity of the line inputs.
Two additional rotary trim pots are pro-
vided to adjust the “sidetone” level for the
intercom interfaces’ talkback functions.
All switches and trim pots are accessible
via the bottom of the Model 230’s enclo-
sure; the unit does not have to be disas-
sembled. Changes made to any of the
configuration parameters become active
immediately. To prevent access to the
configuration controls a security plate,
included with each unit, is attached to
the bottom of the enclosure.
Connectors
The Model 230 uses standard connec-
tors throughout. The microphone input,
line inputs, IFB input, and intercom inter-
face functions use 3-pin female XLR con-
nectors. The main output and line-level
talkback output functions use 3-pin male
XLRs. The headphone output utilizes a
¼-inch 3-conductor jack. The external
source of 24 volt DC power is connected
by way of a 2.1 x 5.5 mm “locking” coaxial
power jack.