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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 IFBR1B receiver provides simplicity and flexibility in a package that is intui- tive for untrained users to operate. In spite of its tiny size, the new IFBR1B receiver offers excellent performance on par with all of Lectrosonics' IFB products.

The design uses +/-20 kHz FM deviation for efficient use of the bandwidth, with compandor noise reduction circuit- ry for an excellent signal to noise ratio. A supersonic Pilot Tone signal controls the audio output squelch to keep the receiver silent when no transmitter signal is received. The incoming RF signal is filtered and amplified, then mixed down to the IF frequency with a microprocessor controlled synthesizer.

If a monaural earpiece is connected, this condition is automatically accommodated, with no loss of audio output power or battery life. Full output power is available with either type of connector, without the power losses that re- sult from a resistive circuit design. The headphone cable doubles as the receiving antenna.
The receiver will drive a wide variety of earbuds, head- phones and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms.

Operating Frequencies:
Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
Block 941: 941.525 - 951.975, 952.875 - 956.225, 956.475 - 959.825
VHF: 174.100 - 215.750
  • Stores up to 10 frequency presets in memory
  • LCD interface for programming and operation
  • High sensitivity for extended operating range indoors or outdoors
  • USB port for firmware updates
  • Compact, rugged machined aluminum housing
  • Attached battery door
  • 8+ hours battery life with removable LB-50 Li-ion
  • Dock chargeable with optional CHSIFBR1B
  • Pilot tone squelch
  • Compandor noise reduction
  • Frequency Selection Steps: Sensitivity: 25 kHz or 100 kHz, selectable; VHF: 125 kHz
  • Signal/Noise ratio: 95 dB A-weighted
  • Squelch quieting: 90 dB
  • AM rejection: 50 dB, 10 uV to 100 mV
  • Modulation acceptance: ±20 kHz
  • Spurious rejection: Greater than 70 dB
  • Operating temperature range: -20 to 45 degrees C.
  • Third order intercept: 0 dBm
  • Frequency response: 100 Hz to 10 kHz, (+/-1 dB)
  • Audio output: 1V RMS into 50 ohms minimum
  • Antenna: Headphone cable
  • Min. headphone impedance: 16.0 Ohms
  • Programmable memory: 10 frequencies can be stored as presets
  • Controls:
  • Top Panel: Single knob controls Audio Output Level and Power On
    Side Panel: Membrane switches with LCD interface for Frequency, Selection and Preset function
  • Indicators: Multi-color LED indicator for power on and battery status
  • Battery: LB-50 Li-ion 3.6 V 1000 mAH
  • Battery Life: 8 hours per charge with LB-50 Li-ion battery
  • Current consumption: 120 mA
  • Weight: 3.4 oz (with battery and wire belt clip)
  • Size: 2.8 x 2.4 x 0.8 in., 71.1 x 70.0 x 20.3 mm
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