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IFBT4 (UHF, 470)


VRT2 (B1)


Quick Overview

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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.

  • Preset (default) frequency is manually set with hex switches
  • 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 pouch is included

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