Studio Technologies IFB Plus 2005 - Manual (Page 19)

Model 2 User Guide Issue 8, December 2005
Studio Technologies, Inc. Page 19
composite IFB channel 1 audio is sent out
the interface. In the down position, labeled
SEND CH2, composite IFB channel 2 audio
is sent out the interface. The overall send
level is not adjustable. Just like the talent
amplifier and line outputs, the interrupt level
is fixed, and the program level is adjusted
in reference to it. The send level has been
internally configured to give the highest sig-
nal level possible, without overloading the
telephone company equipment.
On interface 2 a level trim pot is provided,
allowing the receive audio to be adjusted
over a ±8 dB range. A quiet signal can be
boosted, and a “hot” signal can be attenu-
ated. The trim pot is accessible via a small
hole in the front panel, directly to the right
of the routing control switch. The trim pot is
active only in the receive mode.
Monitor Output
A level control and source select switch is
associated with the monitor section. The
level control adjusts the output level sent to
the external monitor speaker. IFB channel 1
is monitored when the source select switch
is in the up position. In the down position,
channel 2 is monitored. The middle position
is labeled OFF and the monitor amplifier is,
as you might guess, off!
Power Indicator Light
A red LED indicator light located on the right
side of the front panel is lit any time mains
power is applied to the Model 2. Since the
Model 2 does not contain a power switch,
the power LED should be lit at all times that
power is applied to your equipment racks.
It’s Time to Use the System!
Operation can commence after the Model 2
and related equipment have been installed
and connected. The power LEDs on the
Model 2 and, if present, Model 32 and/or
Model 33 Talent Amplifiers should be lit. If
one or more Model 22 Access Stations are
installed, their pushbutton switches should
be dimly lit.
Ear pieces should be connected to the
talent amplifiers. Both the Model 32 and
Model 33 Talent Amplifiers utilize a ¼-inch
2-conductor phone jack for their audio
output. On the Model 32, either IFB chan-
nel can be selected as the audio source. On
the Model 33, either or both IFB channels
can be selected as the audio source(s). The
level control(s) should be adjusted for the
desired level during an interrupt from the
Model 2’s internal microphone. Note that the
even when the level control(s) are set to the
fully counterclockwise position, the audio
output will not be fully “off.” This ensures
personnel will never (hopefully!) miss an
important cue because a level control was
accidentally turned “off.”
Once the talent amplifier’s output level has
been set, a Model 2 program source can be
selected and the program level control on
the Model 2 adjusted as required. Remem-
ber that the nominal interrupt level is inter-
nally set in the Model 2, and acts as
the system reference.
In the following paragraphs we’ll describe
several simple procedures you can use to
try out the Model 2’s features.
Connect a high quality audio source, e.g.,
compact disc player, to a program input.
Select it as the program audio source for
one of the IFB channels. Set the program
level control to get the yellow meter LED
lighting on signal peaks. Test the monitor
amp—it should let you “rock out” pretty
well. If not, put in a maintenance request
for a better speaker!