Studio Technologies 230 2008 - Manual (Page 43)

Model 230 User Guide Issue 7, October 2008
Studio Technologies, Inc. Page 43
This can be successfully done as long as
several limitations are taken into account.
The first limitation is that the 10 k ohm
input circuit presents an unbalanced load
to the source. In most cases this shouldn’t
pose a problem. If a balanced intercon-
nection scheme must be maintained an
in-line isolation transformer can be used.
A second limitation is that the audio level
presented to pin 2 (IFB channel 1) must
not exceed 0 dBu or signal “clipping” may
occur. Prepare a 3-pin male XLR-type con-
nector so that the line-level audio source
designated as IFB channel 1 is connected
with signal high on pin 2 and low/shield
on pin 1. The audio source designated as
IFB channel 2 should be connected with
signal high on pin 3 and low/shield on pin
1. With this connection scheme the nomi-
nal input level is –10 dBu, the same as
with an IFB circuit. This may require that
an external attenuator (“pad”) be used to
reduce the level of the connected signal.
As expected, powering the Model 230
in this scenario will require an intercom
line or external source of 24 volt DC to
be connected.
Additional Connectors
Three spare connector locations are
provided on the Model 230’s back panel.
From the factory they contain blank
plates that can be readily removed and
replaced with a variety of XLR-type con-
nectors. These spare connector locations
are specifically included so that a Model
230 can be customized to meet the many
specific needs that arise in broadcast and
related audio applications. Expected uses
for these locations include adding a 5-, 6-,
or 7-pin XLR-type connector to allow direct
connection of a broadcast headset. Other
uses include creating “loop through” or
“mult” functions for the line-level talkback
output, IFB input, or intercom interface
connections.
The spare connector locations are com-
patible with the Neutrik DL-series of
connectors. For flexibility, versions are
available that provide from three to seven
contacts. For example, a compatible 3-pin
female connector would be Neutrik part
number NC3FD-L-1. To support headsets
the NC6FDS-L-1 is often used. This is a
6-pin female connector with the unique
Switch-craft 6-pin arrangement. The hard-
ware that secures the blank plates to the
Model 230’s back panel is also intended
to secure the replacement connectors.
If connectors are added to the Model
230’s spare connector locations adding
labels to those connectors can be helpful.
For a great look it is recommended that
Brother® P-Touch ¼-inch (6 mm) labels
be created. Tape material that prints white
text on a black background works out
well for the Model 230. The Brother label
cassette number TX-3151, white on black,
is appropriate for use with many of their
printers.
In addition to the spare connector loca-
tions on the back panel, provision has
been made to allow easy interconnection
with the Model 230’s printed-circuit-board-
mounted input and output connectors.
This was accomplished by including
numerous 3-position male “header” con-
nectors on the Model 230’s circuit board.
These headers, on 0.1-inch centers, are
wired in parallel with the Model 230’s con-
nectors. This “no solder” solution makes
customizing a Model 230 a simple pro-
cess. The headers, located on the Model
230’s printed circuit board, are Molex®
part number 22-23-2031. They mate with
Molex housing number 22-01-3037. To
make the interconnection, separate crimp