Studio Technologies 41 2013 - Manual (Page 7)

Model 41 User Guide Issue 3, November 2013
Studio Technologies, Inc. Page 7
a variety of conditions. Unlike other in-
terface devices that use a common but
less-than-ideal circuit topology, a unique
IFB output circuit was developed by Stu-
dio Technologies to achieve the desired
performance goals. The result is a major
improvement in effectively supporting IFB
user devices over a wide range of condi-
tions. Connected devices can draw up to
the maximum 220 milliamperes of current
with little drop in DC voltage. This out-
put voltage stability is the key—whether
drawing 50, 100, or 200 milliamperes,
the output will remain close to 30 volts.
In practical terms this means that reliable
IFB-based cue systems can now be de-
ployed in more stadiums, concert halls, or
motor racing facilities than was previously
possible—longer cable runs, more user
devices, excellent performance.
Audio Monitoring
To help confirm proper installation and
ensure correct operation, the Model 41
includes a full-featured audio monitor sec-
tion. Two 5-segment LED meters provide
an indication of the audio levels as they
appear directly on the IFB output connec-
tors. This capability makes it simple to
adjust and maintain correct audio levels
so that optimal IFB performance can be
achieved. A headphone output is also pro-
vided, allowing “real world” checking of
IFB audio quality. In addition to being able
to manually select the IFB output to be
monitored by the meters and headphone
output, an “auto scan” mode is also in-
cluded. This allows each of the four IFB
outputs to be monitored in a continuously
repeating sequence.
DC Monitoring and Fault
Shut Down
To prevent possible damage to the Model
41’s output circuitry and connected user
devices, the DC output voltage present
on pin 2 of each IFB output is continually
monitored. If the voltage on an IFB output
falls below 24 volts its associated LED will
“flash” as an error indication. If this under-
voltage condition continues for more than
four seconds a shut down mode will be
entered, turning off power to the IFB out-
put. After a 10-second interval the output
will again become active.
Compatibility
The Model 41 is compatible with virtu-
ally every digital matrix intercom system,
including those from Clear-Com®, RTS®,
and Riedel®. Interfacing requires only the
connection of analog output ports from
the intercom system to the Model 41’s
audio inputs. Optimal performance will be
gained by configuring the nominal audio
level of the intercom system’s “virtual” IFB
output ports to match the Model 41’s nom-
inal +4 dBu input level. With the Model
41’s excellent audio and power delivery
performance it’s an ideal alternative to the
interface devices offered by the intercom
system vendors. Using the Model 41 the
intercom system’s audio quality can be
maintained all the way to the IFB users.
The Model 41’s IFB outputs allow virtually
every type of IFB user device to be sup-
ported. These include the Models 32A,
33A, and 34 listen-only beltpacks and
Model 200-Series announcer console
products from Studio Technologies.
The 30-series units offer a range of
features while providing excellent audio