Studio Technologies 240 - Manual (Page 6)

Issue 1, August 2013 Model 240 User Guide
Page 6 Studio Technologies, Inc.
System Features
Headset for Microphone
and Phones
A 5-pin XLR connector is provided for con-
nection of a broadcast-style headset. The
selected headset should contain a dynamic
microphone and a single or dual earpiece.
While not directly intended for on-air
applications, the microphone preamplifier
is excellent, providing low-noise, low-
distortion, and high headroom performance.
For optimal sound quality the gain of the
mic preamp can be configured from among
five choices. A sophisticated audio com-
pressor circuit follows the microphone
preamplifier to minimize the chance of
signal overload. The headphone output
features low-noise circuitry with plenty of
all-important headroom. Many parameters
associated with the headphone output can
be configured to meet user requirements.
Main Outputs
Four main outputs are provided which can
be independently configured to meet the
specific needs of broadcast and production
applications. They can be, at their most
basic, considered talkback channels that,
under pushbutton control, contain the signal
from the connected headset’s microphone.
When an additional audio source is se-
lected for use by a main output a compos-
ite program/interrupt talent cueing signal is
created. Each main output provides a line-
level signal that’s transformer and capaci-
tor coupled for superior compatibility and
reliability. Resistors in series with the
output signals allow passive mixing of
multiple main output channels. And not
to be ignored is the audio quality: clean,
quiet, and “click free.”
Intercom Interface
The intercom interface is compatible
with single- and dual-channel party-line
(PL) intercom circuits commonly found
in broadcast, production, and industrial
applications. Direct connections with PL
circuits associated with RTS™ TW and
Clear-Com® intercom systems is assured.
The Model 240 can be configured to serve
in a listen-only mode where PL intercom
receive audio is routed to the headphone
output. Main outputs 3 and 4 can also be
independently selected to send talk audio
to the intercom circuit. The latter makes
the Model 240 function as a full 2-channel
intercom user station. The intercom circuit
can also provide the power required by the
Model 240.
Figure 2. Model 240 back panel