Studio Technologies 42A 2008 - Manual (Page 8)

Issue 1, February 2008 Model 42A User Guide
Page 8 Studio Technologies, Inc.
listen-only belt packs and Model 200-series
announcer console products from Studio
Technologies. The 200-series units combine
a variety of microphone control, headphone
monitoring, IFB and intercom system inter-
facing, and related functions into compact
desktop units. Industry-standard listen-only
belt packs from RTS, including the 4020
and 4030, can also be directly supported.
Alternate Applications
In addition to broadcast intercom applica-
tions, the Model 42A can be used to create
high-performance stereo headphone cue
systems. Line-level signals coming from an
audio console, a routing switcher, or an off-
air receiver can be connected to the Model
42A’s audio inputs. The IFB circuits can be
connected to listen-only belt packs, several
models of which are available from Studio
Technologies. For example, the Model 35
Talent Amplifier will allow one or two pairs of
stereo headphones to be supported. Each
of the Model 42A’s four IFB circuits will sup-
port up to six Model 35 Talent Amplifiers.
Installation
In this section you will be installing and in-
terconnecting the Model 42A. The one-rack-
space unit will be mounted in an equipment
rack. Audio input connections will be made
by way of a 25-pin D-subminiature con-
nector. IFB circuits will be interfaced using
3-pin male XLR-type connectors. AC mains
power will be connected by means of a
detachable cord that is compatible with the
Model 42A’s 3-pin IEC 320 C14-type inlet
connector.
System Components
The shipping carton contains the Model
42A Interface and associated user guide.
Units destined for North America and
Japan also include an AC mains cord.
Your dealer or distributor should provide
an AC mains cord for other destinations.
Locating the Model 42A
The Model 42A’s IFB circuits provide DC
power and unbalanced audio to operate
external IFB user devices. These devices
are often IFB “belt packs,” broadcast
announcer consoles, or other “talkback
boxes.” The Model 42A’s mounting loca-
tion will dictate the length of the cable runs
needed to link the unit with the connected
devices. In some cases the location
choice is already established. For ex-
ample, in field broadcast applications the
Model 42A will often be located in a pro-
duction truck or trailer. Alternately, it may
be part of a semi-portable television field
production equipment configuration, e.g.,
in a sports event “booth package” system.
But in fixed applications it’s best to select
the Model 42A’s mounting location so
as to minimize cable length. In general,
shorter cables will lead to more reliable
and consistent system performance. It’s
also helpful if a technician can readily view
and access the monitor section that is
located on the right side of the Model
42A’s front panel. The output status LEDs
and level meters can serve important roles
in ensuring correct IFB circuit operation.
Access to the headphone output jack and
level control can also be useful.
Mounting the Model 42A
Once the desired mounting location has
been selected, the Model 42A will require
one space (1.75 vertical inches) in a stan-
dard 19-inch (48.3 cm) equipment rack.
Secure the unit into the equipment rack
using two mounting screws per side.