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Studio Technologies Model 2A IFB Plus Series Central Controller

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Product Code: 9999-06412
Studio Technologies Model 2A
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Studio Technologies Model 2A IFB Plus Series Central Controller

Studio Technologies Model 2A IFB Plus Series Central Controller

Studio Technologies IFB Plus Series Model 2 Central Controller Details
The Studio Technologies IFB Plus Series Model 2 Central Controller is a single rack-space unit that contains all the circuitry to implement a sophisticated 2-channel IFB system for electronic news gathering (ENG) and outside broadcast (OB) vans, satellite news gathering (SNG) vehicles, and mobile production facilities. Interruptible foldback (also known as talent cueing) allows reporters and other on-air talent to receive program audio along with audio cues from production personnel, generally directors and producers.

Studio Technologies IFB Plus Series Model 2 Central Controller Features
  • Two IFB Channels
    • The Model 2 contains two independent IFB channels. Each channel has a complete set of controls and indicators. Program source select switches allow one or more of the four program inputs, as well as incoming audio from the two telephone interfaces, to be selected as program audio. Program level controls allow adjustment of the selected program sources. Channel audio level is displayed by 5-segment LED meters. Channel interrupt activity is displayed by LED indicator lights.
  • Program Inputs
    • The Model 2 has four program inputs that can be individually assigned to the two IFB channels. Each program input has a trim pot that allows the nominal +4 dBu input level to be adjusted over a ±8 dB range. During interrupt activity, program audio is muted. A sophisticated analog switch is used to give a noise-free mute with absolutely no clicks or pops.
  • IFB Outputs
    • Each IFB output (program and interrupt audio) is sent to four places: the talent amplifier output, a line output, telephone interface 2, and the monitor amplifier. The talent amplifier output provides IFB channel 1 and 2 audio, along with power to support any combination of up to four Model 32A or Model 33A Talent Amplifier units. The balanced line-level output can be used to drive wireless IFB transmitters, etc. Using telephone interface 2, IFB audio from channel 1 or 2 can be used to originate an IFB feed. An external speaker or headphones can be connected to the internal 4-watt amplifier, allowing monitoring of either IFB channel.
  • Internal Interrupt Microphone
    • An electret-type microphone is contained behind the Model 2's front panel. Two switches allow the internal microphone to interrupt either IFB channel with clean, clear audio.
  • Telephone Interfaces
    • The Model 2 contains two telephone interfaces. Each interface can be used to bring program or interrupt audio into the Model 2. In most applications, telco signals will be used as program audio sources. In special situations they can serve as an interrupt source in conjunction with the voice operated (VOX) interrupt function. The receive audio level of each telephone interface is adjustable using a front panel control. In addition to receiving audio, interface 2 can be used to originate an IFB feed. Using this function, audio from IFB channel 1 or 2 can be sent to a studio, a remote vehicle, or a portable telephone.
    • The telephone interfaces are unique in that they allow two very different telephone "lines" to be correctly interfaced. Each interface can be set to operate with a telephone line or a standard audio signal. A telephone line would be a 2-wire DC-biased circuit provided by a local telephone company. A standard audio signal could be provided by, for example, a cellular telephone.
    • The two operating modes supply distinct feature sets. When an interface is set to the telephone line mode, full monitoring and control is implemented. Each interface contains a switch that allows the telephone line to be seized (taken off hook) or hung up. When an interface is active, telephone line loop current is monitored. The interface will automatically hang up if a telephone company provided disconnect signal is received. Interface 2 also implements an auto answer function, "answering" the telephone line when ringing is detected.
    • When an interface is set to handle a standard audio signal, the loop-current-specific features are disabled, and the interface operates as a transformer-coupled balanced audio input. The input and output audio levels are optimized for use with telephone-type audio signals.
  • Voice Operated (VOX) Interrupt
    • For special applications, the Model 2 allows an audio signal to serve as both an interrupt audio source and a control source, eliminating the need for a push-to-talk button or contact closure. A switch is used to select the VOX audio source. The choices are: receive audio from Telephone Interface 1, receive audio from Telephone Interface 2, or audio from the VOX line-level input.
  • Monitor Amplifier
    • The Model 2 contains a 4-watt audio amplifier, allowing either IFB channel to be monitored. A click-free analog switch mutes the monitor output when the internal microphone is actively interrupting an IFB channel. In addition, Model 22 or Model 24 Access Stations can be configured to mute the monitor amplifier upon interrupt.
  • Audio Quality
    • Great care was taken to make the Model 2's audio sound clear and crisp. The unit's specifications belie its seemingly humble function as an IFB unit. This unit sounds great!
    • Each IFB channel includes a studio-quality compressor circuit. The compressors even out variations in interrupt audio signals, making talent cues more intelligible and helping reduce the risk of abnormally high signal levels from reaching the talent's ears.
  • Installation
    • For easy installation and maintenance, standard connectors are used throughout, including male and female XLR-type, ¼-inch tip and sleeve, 9-pin D-subminiature, and modular telephone jacks. Mains power is factory selected for 115 or 230 V, 50/60 Hz. The Model 2 is mounted in one space of a standard 19-inch rack.

Studio Technologies IFB Plus Series Model 2 Central Controller Specifications

  • IFB Channels: 2
    Channel Features: 6-input program select switch, program level control, 2 status LEDs, 5-segment LED level meter
  • General Audio Parameters:
    Audio Switching and Muting: "clickless" using special "ramping" analog switches
    Distortion (THD+N): 0.3%
    Overall Frequency Response: 20 Hz to 20 kHz, ±0.5 dB
    S/N Ratio: 67 dB
    Interrupt Audio Compressor/Limiters: one per IFB channel, studio quality, dual slope
  • Connectors:
    Audio Inputs: 3-pin XLR-type, female
    Audio Outputs: 3-pin XLR-type, male
    Talent Amplifier Output: 3-pin XLR-type, male
    Monitor Amplifier Output: ¼-inch, 2-conductor phone jack
    Access Station: 9-pin, D-subminiature, female
    Telephone Interfaces: 6-position modular (RJ11-type jack)
    Mains Power: standard 3-blade IEC-type plug
  • Internal Interrupt Microphone: electret condenser
  • Program Inputs: 4
    Type: electronically balanced, direct coupled
    Impedance: 24 k ohms
    Level: +4 dBu, nominal, trim adjustable ±8 dB
  • Auxiliary Audio Input:
    Type: electronically balanced, direct coupled
    Impedance: 24 k ohms
    Level: +4 dBu, nominal, trim adjustable ±8 dB
    Application: used with voice operated (VOX) interrupt
  • Talent Amplifier Output:
    Application: provides power and audio signals for up to four Model 32A or Model 33A Talent Amplifiers. The output connector (3-pin XLR-type, male) has common on pin 1, +22 Vdc modulated with channel 1 audio (nominal â?"10 dBu) on pin 2, and channel 2 audio (nominal â?"10 dBu) on pin 3.
  • Line Outputs: 2, one per IFB channel
    Type: electronically balanced, capacitor coupled, intended to drive 600 ohm or greater loads
    Level: +4 dBu, nominal, +24 dBu maximum
  • Voice Operated (VOX) Interrupt Function:
    Input Source: receive audio from telephone interface 1 or 2, or auxiliary audio input, selectable
    Output: IFB channel 1 or 2, selectable
    Detection Bandpass: 400 to 1400 Hz, nominal
    Detect Time: less than 1 mSec
  • Telephone Interfaces 1 and 2:
    Operating Modes: switch selectable for use with telephone lines or standard balanced or unbalanced audio signals
    Receive Audio Level: â?"15 dBu, nominal, trim adjustable ±8 dB
    Telephone Line Requirements: 2-wire, loop start, 10 mA loop current minimum
    Telephone Line Disconnect: manual, using front panel switch; automatic, after detection of 250 mSec, nominal, break in loop current
    Telephone Line Interface Control: switch on front panel allows manual off-hook and manual hang-up functions
  • Telephone Interface 2â?"Additional Features:
    Auto Answer: when set for telephone line operation, answers on 1 ring
    Audio Routing Control: switch on front panel allows Interface 2 to receive audio, or send IFB channel 1 or 2 audio
    Send Audio Level: â?"6 dBu, nominal
  • Monitor Output:
    Power: 4W RMS into 8 ohms at 1% THD+Noise
    Application: designed to drive loads of 8 ohms or greater
  • Access Station Interface: allows connection of up to four Model 22 or Model 24 Access Stations
  • AC Mains Requirement: 115 or 230 V, ±10%, internally configurable, 50/60 Hz, 20 watts maximum
  • Dimensions (Overall):
    19.00 inches wide (48.3 cm)
    1.72 inches high (4.4 cm)
    11.40 inches deep (29.0 cm)
  • Mounting: one space in a standard 19-inch rack
  • Weight: 10.4 pounds (4.7 kg)
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