Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter

The Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter is an exceptional choice for professionals in the broadcasting and film industries who require reliable and high-quality audio transmission. Built with Digital Hybrid Wireless™ technology, this transmitter offers up to 256 UHF frequencies in 100 kHz steps, ensuring seamless communication in challenging environments. Engineered with precision, the compact yet powerful design allows for flexibility, making it perfect for broadcast, motion picture, theater, and stage applications where extended operating range and high-quality audio are essential.

Designed for versatility, the IFBT4 can function as a stand-alone device or can be integrated directly into popular intercom systems. The microprocessor-controlled operation not only simplifies use but also eliminates transients during power up and down, making for a user-friendly experience. With a robust power output of 250 mW (50 mW for export versions and the IFBT4-VHF), it is capable of delivering long-range audio transmission, vital for dynamic settings such as live events or film shoots.

The IFBT4 also features a pilot tone squelch control that enhances reliability by preventing unwanted noise. The built-in microphone preamp and multi-use XLR input jack ensure that audio quality is never compromised, providing options for various input types. Additionally, the rugged machined aluminum construction ensures durability, while the compact size makes it easy to use anywhere. To top it off, a protective leather pouch is included for safe transport.

Key Features

• Digital Hybrid Wireless™ technology for superior audio quality.
• Up to 256 UHF frequencies in 100 kHz steps for maximum flexibility.
• Microprocessor controlled operation for user-friendly experience.
• 250 mW power output for long-range use (50 mW for export versions & IFBT4-VHF).
• Pilot tone squelch control to eliminate unwanted noise.
• Multi-use XLR input jack with built-in microphone preamp.
• DIP switch programmable intercom input for versatility.
• Tx mute for frequency scrolling to avoid interference.
• Multi-function LCD display for easy monitoring of settings.
• Compact size for convenient use in any setting.
• Rugged machined aluminum construction for durability.
• (VHF model) Offers 239 Frequencies between 174 and 215 MHz.
• Includes a protective leather pouch for safe transport.

Technical Specifications

Operating Frequency Range
US Blocks:

• Block 470: 470.100 - 495.600 MHz
• Block 19: 486.400 - 511.900 MHz
• Block 20: 512.000 - 537.500 MHz
• Block 21: 537.600 - 563.100 MHz
• Block 22: 563.200 - 588.700 MHz
• Block 23: 588.800 - 607.900 MHz
• Block 944: 944.100 – 951.900 MHz

Channel Spacing
100 kHz (0.1 MHz)

RF Power Output
US, X: 250 mW; E01: 50 mW

Pilot Tone
US: 25 to 32 kHz; 3.5 kHz deviation (Nu Hybrid mode)
E01: 29.997 kHz; 2 kHz deviation (IFB Mode), 25 to 32 kHz (Digital Hybrid Mode)
X: 29.997 kHz IFB & 100 MODE, 32.765 kHz 200 MODE, 400 MODE step selected

Spurious Radiation
US: Compliant with ETSI EN 300 422-1 v1.4.2
E01: 37 dBc above 1 GHz

Frequency Stability
±0.001% (10 ppm) @ 25° C

Temperature Stability
±0.001% (10 ppm) from -30° C to +50° C

Channel Selection
Momentary pushbutton switches, TUNE Up and Down

Compatibility Modes
US: Mode 3, IFB and Nu Hybrid
E01: IFB, Digital Hybrid Wireless (400 Series)
X: Digital Hybrid Wireless™ 400 Series, 100 Series, 200 Series, Mode 3, Mode 6, and IFB

Audio Frequency Response
100 Hz to 8 kHz, ±1 dB, IFB mode system response
30 Hz to 20 kHz, ±1 dB, Nu Hybrid mode system response

Rolloff
Low frequency audio rolloff is Menu selectable for 3 dB down at 35 Hz or 50 Hz.

Signal to Noise Ratio
90 dB typical (“A” weighted)

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, rolloff, audio level, and tuning groups.

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
9.6 oz (272 grams)

Size
5.25” L (including connectors) x 3.25” W x 1.25” H
133.35 mm L (including connectors) x 82.55 mm W x 31.75 mm H

Emission Designator
110KF3E

What's Included

• 1 – Pouch (Part #CCMINI)
• 1 – Locking Power Cable With Pigtail (Part #21586)
• 1 – Power Supply (Part #DCR12/A5U)
• 1 – Transmitter Antenna (Part #A500RAXX) (cut to block)
• 1 – Manual