Manual
Model 43D User Guide Issue 1, September 2015
Studio Technologies, Inc. Page 9
panel is going to be used as part of the
installation it will typically be shipped in
a separate carton. If the installation or
specific application requires an external
source of 12 volts DC it needs to be pro-
vided separately. An applicable power sup-
ply, the Studio Technologies PS-DC-02, is
available as an option.
Locating the Model 43D
The location of the Model 43D may
primarily depend on the length of cable
needed to link the unit with the associated
powered IFB devices. This type of circuit
carries unbalanced audio which can be
susceptible to interference and crosstalk
issues. And since powered IFB circuits
also carry DC power a voltage drop due to
the resistance in the interconnecting cable
can become an issue. In general, minimiz-
ing the length of the cables used with the
powered IFB outputs will help ensure more
reliable and consistent powered IFB device
performance. Of equal importance is the
100-meter (325-foot) twisted pair Ethernet
cable limitation. But that can be overcome
by using a fiber-optic interconnect between
the related Ethernet switch and the other
switches in the Ethernet network.
Protecting the Enclosure
The Model 43D is shipped as a self-
contained unit suitable for portable use
or placement in a semi-permanent loca-
tion. Installed on the bottom of the chassis
are screw-on “bump on” protectors (also
known as “rubber feet”). These are useful
if the unit is going to be placed on surfaces
where scratching of either the Model 43D
or the surface material could take place.
The “feet” can be removed, without the use
of a tool, when rack- or custom-mounting
the unit.
Rack Mounting the Model 43D
For permanent or mobile applications it
might be desirable to mount one or two
Model 43D units into one space (1U) of a
19-inch rack enclosure. A number of rack-
mount front panels, purchased separately,
are available from Studio Technologies.
The following provides details on how to
install Model 43D units to these panels.
To attach a Model 43D unit to the single-
unit rack-mount panel, begin the process
by using a 5/64-inch hex wrench to re-
move the four 6-32 thread button-head
cap screws that hold the standard front
panel to the chassis. Note that the screws
might be quite tightly affixed. Ensure that
a good-quality hex wrench is used and
press and hold it firmly into the screw
heads while turning counterclockwise.
Unless this recommendation is followed
the wrench could “cam out” and the head
could be “stripped.”
Using the screws that were just removed,
attach the rack-adapter front panel to the
Model 43D’s chassis. To prevent dam-
age care is required when aligning the
front panel with the 24 LEDs and auto null
pushbutton switch that protrude through
both the Model 43D’s chassis and front
panel. Tighten the four screws only after
a careful inspection ensures that the
switch and all 24 of the LEDs protrude
through the front panel without interfer-
ence. To allow vertical clearance in the
associated rack, remove the four “bump
on” protectors from the bottom of the
chassis. They are removed by using the
fingers to rotate them counterclockwise;
no tool is required. Carefully protect and
store the standard front panel, along with
the “bump on” protectors, for possible
later use.