Studio Technologies 41 2004 - Manual (Page 7)

Issue 1, October 2004 Model 41 User Guide
Page 8 Studio Technologies, Inc.
be supported. Each of the four Model 41
IFB circuits will support up to six Model 35
Talent Amplifiers.
Installation
In this section you will be installing
and interconnecting the Model 41. The
one-rack-space unit will be mounted in
an equipment rack. Audio input connec-
tions will be made by way of a 25-pin
D-subminiature connector. IFB circuits will
be interfaced using four 3-pin XLR-type
connectors. AC mains power is connected
by means of a detachable cord set that is
compatible with the Model 41’s 3-pin IEC
320 C14-type inlet connector.
System Components
The shipping carton contains the Model
41 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 41
The Model 41’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 41’s mounting loca-
tion will dictate the length of the cable
runs needed to link the unit with the con-
nected devices. In some cases the loca-
tion choice is already established. For
example, in field broadcast applications
the Model 41 will almost always be located
in a production truck or trailer. But in fixed
applications it may be possible to select
the Model 41’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 41’s front
panel. The output status LEDs and levels
meters can serve important roles in ensur-
ing correct IFB circuit operation. Access
to the headphone output jack and level
control can also be useful.
Mounting the Model 41
Once the desired mounting location has
been selected, the Model 41 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.
Audio Input Connections
The Model 41 has eight line-level audio
inputs, arranged as four 2-channel pairs.
Each pair serves one of the four IFB cir-
cuits. Each IFB circuit, along with its two
associated audio inputs, is completely
independent. Literally any audio source
with a nominal operating level of +4 dBu
can be successfully connected. Trans-
former coupled, the inputs are compat-
ible with balanced or unbalanced signals.
In many applications the analog outputs
from digital matrix intercom systems will
be connected to the Model 41.
For on-air television applications the IFB
sources are generally configured to pro-
vide a single- or dual-channel cue “feed”
to talent personnel. In such cases channel
one of a pair is generally designated as
the “interrupt” channel while channel two
is the “program” channel. For other broad-
cast applications, such as live radio, it’s
possible that a stereo cue source will be