Studio Technologies 200 - Manual (Page 5)

Issue 3, August 2004 Model 200 User Guide
Page 6 Studio Technologies, Inc.
The output of the microphone preamplifier
is used by the main and talkback output
circuits.
One 8-position DIP-type switch array is
used to set the gain of the microphone
preamplifier and the on/off status of the
phantom power. These switches are
accessible via the bottom of the Model
200’s enclosure; the unit does not have
to be disassembled. To prevent access to
the configuration switches a security panel,
included with each unit, is attached to the
bottom of the enclosure.
Main and Talkback Outputs
The Model 200 provides one main and
one talkback output. The main output is
intended to serve as the on-air audio feed.
It is designed as a fully professional inter-
face with high output capability, low distor-
tion, and low noise. It features an output
transformer that is well suited for driving
long broadcast cable runs. The talkback
output is intended to provide production
trucks, control rooms, or support personnel
with a talent-originated cue signal. The talk-
back output is transformer-coupled with
a +4 dBu nominal signal level. It contains
resistors in series with its output connec-
tions, allowing the talkback output from
multiple Model 200 units to be directly
“summed.”
User Controls and Status
Indicators
Two pushbutton switches, three LED indi-
cators, and two rotary controls provide
the user with a clear, easy-to-use interface.
One of the pushbutton switches controls
the status of the main output. This is the
audio output intended for on-air use.
The main output button performs a
“push-to-mute” function that momentarily
mutes the main output. This “cough” func-
tion is typically required for on-air applica-
tions. Two LEDs display the on/off status
of the main output.
A second pushbutton switch controls the
talkback output. This is the audio output
used to communicate with producers,
directors, or other behind-the-scenes pro-
duction personnel. The talkback button
provides a “push-to-talk” function. When
active, the talkback function routes the
microphone signal to the talkback output
while muting the main output. A status LED
is associated with the talkback button. Two
rotary controls allow the user to adjust the
level of the headphone output.
IFB Input
A broadcast-standard “wet” (DC with
audio) IFB circuit can be directly connected
to the Model 200’s IFB input. Originated by
sources such as the RTS™ 4000-series IFB
system or IFB interface devices from Studio
Technologies, the connected IFB circuit can
provide DC power to operate the Model 200
as well as two channels of cue audio.
Cue Sources and Headphone
Output
The two audio sources associated with the
IFB input are routed, by way of interface,
level controls, and output circuitry, to the
headphone output. Originating in produc-
tion trailers, control rooms, or remote loca-
tions, these cue sources typically provide
program-with-interrupt audio on one chan-
nel and program-only audio on the other.
The Model 200 doesn’t perform any cue
source channel rerouting, summing, or
muting. Channel 1 (pin 2 of the IFB connec-
tor) serves as the headphone output’s left