Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production.
In other cases, the IFB system is used by directors and other management to monitor program audio during a production. The IFBR1a-VHF receiver provides simplicity and flexibility in a package that is intuitive for untrained users to operate.
The default frequency of the receiver is set by two rotary switches on the side panel. Up to five additional frequencies can also be programmed into the receiver memory using the scan mode. If more than one frequency is stored in the receiver, the operator can scroll through all stored frequencies by simply pressing the volume knob.
Digital Hybrid Wireless® technology*Microprocessor controlled operation50 mW power output for long range usePilot tone squelch controlMulti-use XLR input jackBuilt-in microphone preampDIP switch programmable intercom inputTx mute for frequency scrollingMulti-function LCD displayRugged machined aluminum construction
Operating Frequencies (MHz): 174.100 to 215.750 MHz
Available Frequencies: 239
Channel Spacing: 175 kHz
RF Power Output: 50 mW
Frequency Stability: ±.001% (10 ppm) @ 25° C
Temperature Stability: ±.001% (10 ppm) from -30° C to +50° C
Channel Selection: Momentary pushbutton switches, tune Up and Down
Compatibility Modes (2)
IFBDigital Hybrid Wireless (400 Series)
Pilot Tone: 29.997 kHz IFB & 400 MODE; each frequency has a unique pilot tone
IFB Mode: FM, ±20 kHz deviationDigital Hybrid Mode: ±75kHz
Audio Frequency Response
IFB Mode: 100 Hz to 8 kHz, ±1 dBDigital Hybrid Mode: 30Hz to 20kHz ±1dB response (see Rolloff)
Rolloff: Low frequency audio rolloff is menu selectable for 3 dB down at 35 Hz or 50 Hz.
Audio Compressor: 2 to 1 (IFB mode)
Output Impedance: 50 ohms
Audio Input Levels
0 dBu for Line, RTS1 & RTS2-10 dBu for Clear Com-42 dBu for mic dry inputs (no phantom power)+/-50Vdc max
Audio Input Config: Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Comm
Audio Input Impedance: Greater than 2 K balanced, greater than 1 K unbalanced at any gain setting
Gain Control Range: -18 dB to +24 dB (0 dB nominal center), Menu selectable
Audio Input Jack: Standard XLR female connector
Input Power: 12 to 14 VDC typical, 200 ma. max.; Max. Input Range 6 to 18 VDC
Power Input Jack: Coax type, locking LZR RL26AE
Indicators: Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, roll-off and audio level
Front panel controls
MENU momentary pushbutton switchPower OFF-TUNE-XMIT, 3 position slide switchSelect Up momentary pushbutton switchSelect down momentary pushbutton switch
Rear panel controls: Input Mode Select, 4 section DIP switch
Weight: 9 ozs.
Size: 5.25" L (including connectors) x 3.25" W x 1.25" H
Emission designator: 180KF3E
Manufacturer Part Number : IFBT4-VHF