Lectrosonics R1a Synthesized UHF Belt-Pack IFB Receiver

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  • Lectrosonics R1a Synthesized UHF Belt-Pack IFB Receiver

What's in the Box

  • Lectrosonics R1a Synthesized UHF Belt-Pack IFB Receiver
  • Lectrosonics 40013 9-volt
  • Lectrosonics 35679 Adjustment Tool
  • Lectrosonics VSR1 Velcro Strain Relief
  • Lectrosonics 35698 Pouch
  • Manual

Product Documents

Due to manufacturer's restrictions this item cannot be shipped outside of the United States.

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

Firmware Version 4

New IFBR1a receivers in the UHF blocks shipping from the factory already have this new firmware installed. If users with older units wish to have the new firmware installed at the factory via the Parts & Repair department, the cost is $60 per unit to cover labor and handling.


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 or call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC).