Studio Technologies 43 - Manual (Page 7)

Issue 1, July 2004 Model 43 User Guide
Page 8 Studio Technologies, Inc.
inside the maze of wires, equipment, and
road cases associated with field produc-
tion!) The unit generates essentially no
heat so providing special ventilation isn’t
an issue; any environment where the long-
term ambient temperature is less than 80
degrees Fahrenheit is adequate. When
selecting a location keep in mind that an
outlet must be available to allow the 24
volt DC power source to be plugged in.
As one would expect, the specific location
selected for the Model 43 will dictate the
length of cable that will be needed to link
the unit with the connected device(s). In
some cases the location choice will have
already been established. For example,
in field broadcast applications the Model
43 will almost always be located in a
production truck or trailer. But in fixed ap-
plications it may be possible to select the
mounting location so as to minimize cable
length. In general, a shorter cable run will
lead to a more reliable and better perform-
ing system.
Audio Input Connections
For simplicity, the Model 43’s two line-
level audio inputs are designated as left
and right. In many broadcast settings
the left input would correspond to chan-
nel 1 and the right channel to channel 2.
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 the left
channel is generally designated as the
“interrupt” channel while the right channel
is the “program” channel. For other broad-
cast applications, such as live radio, it’s
possible that a stereo cue source will be
connected. In this situation the left source
would connect to the left input while the
right would connect to the right input. This
might also be the case with other profes-
sional audio applications, such as record-
ing and post-production.
Audio input connections are made by
way of two 3-pin female XLR-type con-
nectors which are located on one side of
the Model 43’s enclosure. The audio input
circuits are transformed coupled with a
nominal impedance of 10 K ohms. They
have a nominal signal level of +4 dBu
and are compatible with balanced or un-
balanced sources. With balanced sources
the mating connectors (males) should be
wired so that signal high (+ or hot) is con-
nected to pin 2, signal low (– or cold) to
the pin 3, and shield to pin 1. With unbal-
anced sources, connect signal high to
pin 2, and shield to both pins 1 and 3. If
connecting an unbalanced source in this
manner results in hum or noise, try con-
necting signal high to pin 2, and shield to
pin 3; leave pin 1 unterminated.
As previously mentioned, the Model 43 is
compatible with matrix intercom systems
from Riedel Communications. Appendix
A, located near the end of this user guide,
provides detailed connection information.
Audio Input Source Level
Adjustment
Literally any audio source with a nominal
operating level of +4 dBu can be success-
fully connected to the Model 43’s audio in-
puts. Transformer coupled, the inputs are
compatible with balanced or unbalanced
signals. In some applications two analog
outputs from a digital matrix intercom
system will be connected to the Model 43.
It’s important to confirm and, if required,
adjust the nominal output level provided
by the specific system. In reality, it’s ac-
ceptable that the nominal level deviates