Lectrosonics IFBR1A
Belt Pack IFB Receiver, Synthesized UHF, with Pouch


Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production.
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Lectrosonics IFBR1A
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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 IFB R1a receiver provides simplicity and flexibility in a package that is intuitive for untrained users to operate.

The receiver is housed in a rugged machined aluminum package. An optional spring-loaded belt clip (shown at right) provides a secure mounting on a wide variety of belts, pockets and fabrics. The belt clip is removable to reduce its size and allow mounting into other types of bags and belt worn mounting systems common in field production.


  • Preset frequency can be set without power or transmitter signal
  • Scan mode stores up to five additional frequencies
  • Multi-color LED and rotary control for programming and operation
  • High sensitivity for extended operating range indoors or outdoors
  • Rugged machined aluminum housing
  • Attached battery door
  • 8 hours battery life (alkaline)
  • 20 hours battery life (lithium)
  • 256 frequencies in 100 kHz increments
  • Microprocessor controlled
  • Pilot tone squelch
  • Compandor noise reduction


  • Operating Frequencies: 537.600 to 767.900 MHz (608 to 614 MHz not available in USA)
  • Frequency Control: Crystal Controlled PLL
  • 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
  • Third Order Intercept: 0 dBm
  • Frequency Response: 100 Hz to 10 kHz (+/-1dB)
  • Pilot Tone: 29.997 kHz, 4.5 kHz deviation (fixed crystal controlled)
  • Audio Output: 1V RMS into 50 ohms minimum
  • Antenna: Headphone cable
  • Programmable Memory: Switches set default frequency; up to five additional frequencies can be stored in memory
  • Front Panel Controls: Single knob controls Audio Output Level, Power On, Programming and Scan Frequency Selection
  • Indicators: Multi-color LED indicator for power on and battery status. Blinks to indicate channel number and during scanning
  • Power Requirement: 9V alkaline battery lasts about 8 hours; 9V lithium battery lasts about 20 hours
  • Power Consumption: 60 mA
  • Weight: 7.3 oz with battery
  • Size: 3.6" x 2.4" x 0.8" (housing only)

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