Lectrosonics IFBR1B Belt-Pack IFB Receiver


Multi-Frequency Belt-Pack IFB Receiver


SKU: N/A Categories: , , Tag:


  • 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

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 intuitive 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 circuitry 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 result from a resistive circuit design. The headphone cable doubles as the receiving antenna.

The receiver will drive a wide variety of earbuds, headphones and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms.

The receiver operates on a single 3.6 V rechargeable LB-50 Li-ion battery that will provide about eight hours of operation per charge. The LED indicator changes color from green to red as the battery voltage declines to provide plenty of warning before operation ceases. Inside the battery door is a USB port for firmware updates in the field.

The IFBR1B is housed in a rugged machined aluminum package. A wire beltclip is included and provides a secure mounting on a wide variety of belts, pockets and fabrics.


    Frequency Selection Steps: 25 kHz or 100 kHz, selectable; VHF: 125 kHz
    Sensitivity 1 uv (20 dB SINAD)
    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
  • 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)