Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)

Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)

Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)


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Product Highlights

  • Digital Hybrid Wireless Technology
  • Microprocessor-Controlled Operation
  • 50mW Power Output
  • Pilot Tone Squelch Control
  • XLR Input Jack
  • Built-In Microphone Preamp
  • TX Mute for Frequency Scrolling
  • Multi-Function LCD Display
  • Rugged, Machined Aluminum Construction
  • Includes AC Adapter
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Lectrosonics IFBT4-VHF overview

  • 1Description

The IFBT4-VHF Frequency Agile IFB Transmitter from Lectrosonics is designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. It can be used as a stand-alone device, or it can be patched directly into a popular intercom system.

Featuring 50mW output power and a design based on Lectrosonics patented Digital Hybrid Wireless system, the transmitter pilot tone signal controls the audio squelch on the IFBRA-VHF receiver (sold separately) to eliminate noise when the transmitter is turned off. This prevents the receiver from locking onto false signals. An LCD display is backlit for use in dimly lit conditions and is also visible in direct sunlight.

Furthermore, DIP switch settings on the rear panel provide direct compatibility with RTS and Clear Com intercom systems. A preamp stage is also included in the input stage and allows direct connection to dynamic microphones in stand-alone applications. Moreover, direct output at studio line level can also be fed directly into the transmitter.

Finally, the transmitter is housed in a strong, machined-aluminum case with an electrostatic powder coating and an anodized finish. It is powered by 6 to 18 VDC via a locking connector on the rear panel. Additionally, the transmitter is supplied with a 1/4 wavelength whip antenna, which is a detachable, galvanized-steel cable that also connects to a locking 50 ohms BNC connector on the rear panel. The AC power supply is also included.

In the Box
Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)
  • 1/4 Wave BNC Whip Antenna
  • AC Adapter
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Lectrosonics IFBT4-VHF specs

    Operating Frequency 174.100 to 215.750 MHz
    Channel Frequencies 239
    Channel Spacing 175 kHz
    RF Power Output 50 mW
    Frequency Stability ±.001% (10 ppm) @ 77°F (25°C)
    Temperature Stability ±.001% (10 ppm) from -22 to 122°F (-30 to 50°C)
    Channel Selection Momentary pushbutton switches, tune Up and Down
    Compatibility Modes Two: IFB and Digital Hybrid Wireless (400 Series)
    Pilot Tone 29.997 kHz IFB & 400 MODE; each frequency has a unique pilot tone
    Modulation IFB Mode: FM, ±20 kHz deviation
    Digital Hybrid Mode: ±75 kHz
    Frequency Response IFB Mode: 100 Hz to 8 kHz, ±1 dB
    Digital Hybrid Mode: 30 Hz to 20 kHz ±1 dB response (see Roll Off)
    LF Roll Off Menu selectable for 3 dB down at 35 Hz or 50 Hz
    Audio Compression 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)
    +/-50 VDC maximum
    Configuration Audio Input: Balanced and unbalanced rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Com
    Audio Input Impedance Greater than 2 KOhms balanced, greater than 1 KOhms 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 maximum
    Maximum Input Range: 6 to 18 VDC
    Power Input Connection Coax type, locking LZR RL26AE
    Indicators Backlit LCD: 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
    Emission Standard 180KF3E
    Dimensions (L x W x H) 5.25 x 3.25 x 1.25" (13.3 x 8.25 x 3.17 cm)
    Weight 9 oz (255 g)
    Packaging Info
    Package Weight 3.25 lb
    Box Dimensions (LxWxH) 14.0 x 10.7 x 4.2"

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