Lectrosonics IFBT4-VHF Frequency-Agile Compact IFB Transmitter

1,245.00 USD

The Lectrosonics IFBT4-VHF transmitter was designed for use in broadcast, motion picture, theater, and stage applications, where extended operating range and high-quality audio are essential.

Unavailable for shipping outside of The United States and Canada.


SKU: LEC.IFBT4VHF Categories: , , , , Tag:


Lectrosonics IFBT4-VHF Frequency-Agile Compact IFB Transmitter

  • Digital Hybrid Wireless® technology
  • Microprocessor controlled operation
  • 50 mW power output for long range use
  • Pilot tone squelch control
  • Multi-use XLR input jack
  • Built-in microphone preamp
  • DIP switch programmable intercom input
  • Tx mute for frequency scrolling
  • Multi-function LCD display
  • Rugged machined aluminum construction

The Lectrosonics IFBT4-VHF transmitter was designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. The transmitter can be used as a stand-alone device or patched directly into popular intercom systems.

The design is based upon the patented Lectrosonics Digital Hybrid Wireless® system. While at the time of the first release of the product, there is only a companion analog receiver, the Digital Hybrid Wireless system is included for compatibility with future products.


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Operating Frequencies (MHz): 174.100 to 215.750 MHz
Available Frequencies: 239
Channel Spacing: 175 kHz
RF Power Output: 50 mW
Frequency Stability: ±.001% (10 ppm) @ 25° C
Temperature Stability: ±.001% (10 ppm) from -30° C to +50° C
Channel Selection: Momentary pushbutton switches, tune Up and Down
Compatibility Modes (2) IFB and Digital Hybrid Wireless® (400 Series)
Pilot Tone: 29.997 kHz IFB & 400 MODE; each frequency has a unique pilot tone
  • IFB Mode: FM, ±20 kHz deviation
  • Digital Hybrid Mode: ±75kHz
Audio Frequency Response:
  • IFB Mode: 100 Hz to 8 kHz, ±1 dB
  • Digital Hybrid Mode: 30Hz to 20kHz ±1dB response (see Rolloff)
Rolloff: Low frequency audio rolloff is menu selectable for 3 dB down at 35 Hz or 50 Hz.
Audio Compressor: 2 to 1 (IFB mode)
Output Impedance: 50 ohms
Audio Input Levels:
  • 0 dBu for Line, RTS1 & RTS2
  • -10 dBu for Clear Com
  • -42 dBu for mic dry inputs (no phantom power)
  • +/-50Vdc max
Audio Input Config: Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Comm
Audio Input Impedance: Greater than 2 K balanced, greater than 1 K unbalanced at any gain setting
Gain Control Range: -18 dB to +24 dB (0 dB nominal center), Menu selectable
Audio Input Jack: Standard XLR female connector
Input Power: 12 to 14 VDC typical, 200 ma. max.; Max. Input Range 6 to 18 VDC
Power Input Jack: Coax type, locking LZR RL26AE
Indicators: Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, roll-off and audio level
Front panel controls:
  • MENU momentary pushbutton switch
  • Power OFF-TUNE-XMIT, 3 position slide switch
  • Select Up momentary pushbutton switch
  • Select down momentary pushbutton switch
Rear panel controls: Input Mode Select, 4 section DIP switch
Weight: 9 ozs.
Size: 5.25” L (including connectors) x 3.25” W x 1.25” H
Emission designator: 180KF3E