Studio Technologies IFB Plus 2005 - Manual (Page 8)

Issue 8, December 2005 Model 2 User Guide
Page 8 Studio Technologies, Inc.
Three audio sources can serve as the VOX
input: receive audio from telephone interface
1, receive audio from telephone interface 2,
or the auxiliary audio input. The auxiliary au-
dio input is a separate line-level audio input
that serves the VOX circuit only. A 3-position
switch selects which source will be used. A
second 3-position switch selects which IFB
channel the VOX interrupt is assigned to, or
if the function is not active. The VOX function
can be assigned to only one IFB channel at
a time. Each IFB channel contains an LED
indicator light to display when a voice-
activated interrupt is taking place.
Internal Interrupt Microphone
Contained behind the Model 2’s front panel
is an internal interrupt microphone. Associ-
ated with the microphone are two switches,
allowing the internal microphone to interrupt
IFB channel 1, channel 2, or both.
Monitor Section
The Model 2 contains a simple but excel-
lent monitor section. At the core is a 4 watt
audio amplifier designed to drive an 8 ohm
(or greater) loudspeaker. Associated with
the monitor amplifier is a 3-position source
select switch and a level control. The switch
selects monitoring of IFB channel 1 or 2, as
well as having an off position. A click-free
analog switch mutes the monitor output
whenever the internal microphone or a Mod-
el 22 Access Station, if installed and config-
ured, is interrupting either IFB channel.
Model 22 Access Station
The Model 22 Access Station provides the
capability to add up to four additional inter-
rupt locations. Model 22s are intended to be
installed at positions convenient to produc-
ers, directors, or other personnel who need
to “cue” talent and related personnel. The
unit consists of a metal chassis containing
two lighted pushbutton switches, unbal-
anced microphone and balanced line
inputs, and status and control circuitry.
The two high-quality, back lit pushbutton
switches provide access to the two IFB
channels. The lights in the switches dis-
play when an interrupt is taking place on its
respective channel. When a channel is idle,
the light is lit dimly. An input select switch
allows connection of a Model 11A goose-
neck microphone or a line-level signal. The
electronically balanced line-level input al-
lows interfacing with other communications
equipment, such as an intercom system.
The Model 22 can be configured to mute
the Model 2’s monitor amplifier output. This
function will prevent acoustic feedback from
occurring when a Model 22 is located close
to the Model 2’s monitor speaker.
Model 22 Access Stations are linked to the
Model 2 Central Controller via 9-pin D-type
female connectors. Each access station
contains two connectors, allowing a simple
daisy-chain installation. The nine leads carry
all signals; audio, control, status lamp (tally),
and power. The Model 2 provides all power
required by the access stations. The Model
25A 19-inch Rack Adapter is available to
mount a Model 22 and a Model 11A goose-
neck microphone in one space of a 19-inch
rack. The Model 28A Panel Adapter allows
a Model 22 and a Model 11A gooseneck
microphone to be mounted in a panel
opening.
Model 32 & Model 33 Talent
Amplifiers
The Model 32 and Model 33 Talent Ampli-
fiers are self-contained “belt pack” units
that drive talent ear pieces or headsets. A
single 3-conductor microphone-type cable
links the Model 2 with the talent amplifiers.