Studio Technologies 210 2012 - Manual (Page 13)

Model 210 User Guide Issue 5, September 2012
Studio Technologies, Inc. Page 13
directly at the Model 210’s IFB input con-
nector, not at the source of the IFB circuit.
The one or two audio signals provided
by the IFB circuit can serve as the audio
sources for the headphone outputs.
In North American field and in-studio
broadcast applications it is common to
find RTS 4000-series IFB equipment
being used to provide the IFB circuits.
The Model 210 can be directly connected
to, and function correctly with, one of
these circuits. For reliable operation,
especially when using lengthy cable runs,
it’s strong-ly recommended that no other
device be connected to a 4000-series IFB
circuit that is specified for connection to a
Model 210. This requirement is due to the
current-limited DC source that is supplied
by the 4010 IFB Controller.
With 4000-series IFB circuits channel 1
(XLR pin 2) provides program audio that
is “interrupted” with cue signals. This
channel is sometimes referred to as “pro-
gram-with-interrupt.” It’s important to note
that the program audio source fully mutes
whenever directors or producers are com-
municating with on-air talent. Channel
2 (XLR pin 3) of the IFB circuit provides
a “program-only” audio feed. It is never
interrupted with cue signals.
While the Model 210’s IFB input was
designed for connection to a “wet” IFB
circuit, it’s also possible to connect line-
level audio sources. Please refer to the
Technical Notes section of this user guide
for details.
External Power Input
An external source of 24 volt DC power
can be connected to the Model 210 by
way of a 2.1 x 5.5 mm coaxial power jack
which is located on the back panel of the
unit. The center pin of the jack is the posi-
tive (+) connection. While the requirement
for the external source is nominally 24
volts, correct operation will take place
over a 20 to 30 volt range. The Model 210
requires 70 milliamperes at 24 volts DC
for correct operation. Included with each
Model 210 is a 24 volt DC external power
supply. The power supply’s DC output
cable has been terminated with a Switch-
craft® S760K coaxial power plug. This
“locking” type of plug correctly mates
with the Model 210’s 24 volt DC input jack.
The locking feature is important, allowing
the external power source to be securely
attached to the Model 210.
As previously discussed in this user guide,
an IFB circuit connected to the IFB in-
put can serve as the Model 210’s power
source. Alternately, an external 24 volt
DC source can be connected. For redun-
dancy, both the IFB circuit and the exter-
nal source can be connected at the same
time. If one or the other becomes inopera-
tive, the remaining source will provide all
Model 210 power.
Note that if both an IFB circuit and an
external 24 volt DC source are connected,
power will be drawn only from the exter-
nal source. This minimizes the chance
that lengthy cable runs or other IFB circuit
issues will impact Model 210 operation.
Whichever device is providing power,
audio signals from the IFB circuit can still
serve as the audio sources for the head-
phone output.
Pushbutton Labeling
The two pushbutton switches used in
the Model 210 were selected for several
reasons. Foremost was the fact that they
are highly reliable, using gold-plated
contacts for long life in less-than-ideal