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

Wide frequency options provide exceptional flexibility in coordinating frequencies in multi-channel wireless systems and avoiding interference from external RF signal sources and noise. Microprocessor control provides user-friendly operation and eliminates transients at turn-on and turn-off. The transmitter output is muted in the TUNE mode to avoid generating interference in other wireless systems while scrolling up and down to change frequencies.

* 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.

Accessories

The Lectrosonics IFBT4 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. Lectrosonics Digital Hybrid Wireless™ U.S. Patent 7,225,135 systems overcome channel noise in a dramatically new way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link. This proprietary algorithm is not a digital implementation of an analog compandor but a technique that can be accomplished only in the digital domain, even though the inputs and outputs are analog. Because it uses an analog FM link, Digital Hybrid Wireless™ enjoys all the benefits of conventional FM wireless systems, such as excellent range, efficient use of RF spectrum, and resistance to interference. However, unlike conventional FM systems, it does away with the analog compandor and its artifacts. Wide frequency options provide exceptional flexibility in coordinating frequencies in multi-channel wireless systems and avoiding interference from external RF signal sources and noise. The rear panel provides the audio input and programming DIP switches for intercom and audio input type along with power and antenna input jacks. Microprocessor control provides user-friendly operation and eliminates transients at turn-on and turn-off. The transmitter output is muted in the TUNE mode to avoid generating interference in other wireless systems while scrolling up and down to change frequencies. In the XMIT mode, the output is turned on and the frequency cannot be changed. The transmitter delivers 250 mW (50 mW E01) of output power which, when used with an efficient antenna, provides exceptional operating range with the R1A beltpack receiver. Indoors, the signal will penetrate various surfaces and reflect from others efficiently to extend operating range and reduce the need for critical antenna positioning. A supersonic pilot tone signal controls the audio squelch on the R1A receiver to eliminate noise when the transmitter is turned off and it prevents the receiver from locking onto false signals. The pilot tone also eliminates noise in the receiver at turn-on and turn-off. The LCD display is backlit for use in dimly

Features

• Digital Hybrid Wireless™ technology
• Up to 256 UHF frequencies in 100kHz steps
• Microprocessor controlled operation
• 250 mW power output for long range use (50 mW for export versions & IFBT4-VHF)
• 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
• Compact size for use anywhere
• Rugged machined aluminum construction
• (VHF model) Offers 239 Frequencies between 174 and 215 MHz
• Protective leather pouch is included

Specifications

• Channel Spacing: 100 kHz (0.1 MHz)
• US, X: 250 mW
• E01: 50 mW
• Pilot tone: US: 25 to 32 kHz; 3.5 kHz deviation (Nu Hybrid mode)
• Spurious Radiation: US:Compliant with ETSI EN 300 422-1 v1.4.2
• 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 US: Mode 3, IFB and Nu Hybrid
• Response: 100 Hz to 8 kHz, ±1 dB, IFB mode system response (see Rolloff)
• Rolloff: Low frequency audio rolloff is Menu selectable for 3 dB down at 35 Hz
• Signal to Noise Ratio: 90 dB typical (“A” weighted)
• Output Impedance: 50 ohms
• Audio Input Levels: • 0 dBu for Line, RTS1 & RTS2
• Audio Input Config: Balanced and Unbalanced, rear panel selectable for
• Audio Input Impedance: Greater than 2 K balanced, greater than 1 K unbalanced
• 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
• Power Input Jack: Coax type, locking LZR RL26AE
• Indicators: Backlit Liquid Crystal Display. Displays modulation
• Front panel controls: • MENU momentary pushbutton switch
• Rear panel controls: Input Mode Select, 4 section DIP switch
• Weight: 9.6 ozs. (272 grams)
• Size: 5.25” L (including connectors) x 3.25” W x 1.25” H
• Emission designator: 110KF3E