Studio Technologies IFB Plus 2007 - Manual (Page 19)

Model 2 User Guide Issue 9, January 2006
Studio Technologies, Inc. Page 19
applications the appropriate plug must be
attached. The wire colors in the mains cord,
in most cases, will conform to the internation-
ally recognized CEE color code and should
be wired accordingly:
Connection Wire Color
Neutral (N) Light Blue
Live (L) Brown
Earth/Ground (E) Green/Yellow
Operation
The Model 2’s Front-Panel
Controls and Indicators
If you value equipment by the number of
switches and lights per rack space, the
Model 2 is really a good deal—there is more
stuff crammed onto the front panel than we
thought possible! Seriously, the designers
had the difficult problem of getting maximum
functionality into a single rack space. We had
heated arguments about the feature list, what
to include, what to delete. In the end, we feel
that all important features were included.
Once you understand all the functions, we
think you’ll find the Model 2 quite powerful,
yet easy and intuitive to use.
Looking at the Model 2’s front panel from the
left to the right, you should note the func-
tional groups: internal interrupt microphone,
channel 1-related items, channel 2-related
items, voice activated (VOX) interrupt, tele-
phone interface 1, telephone interface 2,
monitor amplifier, and power LED. We’ll dis-
cuss these groups in the following sections.
Internal Interrupt Microphone
The Model 2 contains an internal microphone
which can be used to access either, or both,
of the IFB channels. Two momentary action
pushbutton switches are located on the left
end of the front panel and are labeled IFB
1 and 2. Pressing either switch mutes (or
optionally dims) program audio, mutes the
monitor speaker output, and connects the
microphone to the selected IFB channel(s).
The IFB status LED associated with each
channel will light whenever its correspond-
ing interrupt button is pressed. Notice that
sound enters the microphone via the small
openings in the front panel above and
slightly to the right of the switches.
Program Select, Level Adjustment, and
Indicators
Two identical sets of controls and indicators
serve IFB channels 1 and 2. Each channel
contains six program select switches, two
status LEDs, a program level control, and a
5-segment LED level meter. The six switches
are used to select which of the four program
inputs, and the receive audio from the two
telephone interfaces, will serve as the pro-
gram audio source(s). The switches were
chosen to allow more than one source to be
selected at a time. The ability to simultane-
ously depress and lock multiple buttons is
not a defect, but is a feature which can be
useful in special circumstances.
The red LED, labeled IFB, is lit any time
program audio is being interrupted. There
are three ways an interrupt can take place:
by the internal microphone being activated,
by a Model 22 or Model 24 Access Station
being used, or via a control signal from the
voice operated (VOX) interrupt function. The
yellow LED, labeled VOX, is lit any time inter-
rupt is caused by the VOX function.
The program level control allows the pro-
gram audio signal to be adjusted relative to
the interrupt audio level. The interrupt level
is internally fixed and serves as the refer-
ence. The gain structure was configured
so that the level control set for 50 percent