Lectrosonics IFBR1A-VHF
VHF Multi-Frequency Belt-Pack IFB Receiver


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-VHF
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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 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.

Lectrosonics IFBR1A-VHF Features:

  • Preset (default) frequency is manually set with hexswitches
  • Scan mode stores up to five additional frequencies in memory
  • 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)
  • Protective leather pouchis included

Lectrosonics IFBR1A-VHF Specifications:

  • Operating Frequencies (MHz): 174.100 to 215.750 MHz
  • Available Frequencies: 239
  • Channel Spacing: 175 kHz
  • Frequency control: Crystal Controlled Phase Locked Loop
  • 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, headphone: 1 Vrms into 50 ohms minimum
  • Antenna: Headphone cable
  • Programmable memory: 5 frequencies
  • Front panel controls: Single knob controls Audio Output Level, Power on, programming and Scan Frequency Selection
  • Indicators: 1 tricolor LED Indicator for power on, blinks to indicate channel number, blinks fast during scan, and turns yellow or red for low battery.
  • Power requirement: Single 9V Alkaline Battery for approximately 8 hours operation.
  • Power consumption: 60 ma.
  • Allen wrench for knob: 0.035” (Lectro part number: 35854)
  • Weight: 7.3 oz with battery
  • Size: 3.6 x 2.4 x 0.8 inches

Consumer Alert

This particular wireless microphone device operates in portions of the 617-652 MHz or 663-698 MHz frequencies. Beginning in 2017, these frequencies are being transitioned by the Federal Communications Commission (FCC) to the 600 MHz service to meet increasing demand for wireless broadband services. Users of this device must cease operating on these frequencies no later than July 13, 2020. In addition, users of this device may be required to cease operations earlier than that date if their operations could cause harmful interference to a 600 MHz service licensee’s wireless operations on these frequencies. For more information, visit the FCC’s wireless microphone website at www.fcc.gov/wireless-microphones-guide or call the FCC at 1- 888-CALL-FCC (TTY: 1-888-TELL-FCC).

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