By: Lectrosonics
Wireless Microphones & Audio Processors
Contact us for lowest price (800) 284-2288, (858) 565-1101,, or fax (858) 300-4193
Frequency-Agile IFB Transmitter

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

Lectrosonics Digital Hybrid Wireless™ 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.

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.

IFBT4 features include:

  • Sleek, easy to use IFB transmitter with long range, terrific audio, and low distortion
  • Digital Hybrid Wireless technology combines digital and analog technologies to reap the benefits of both
  • Choose from 256 UHF frequencies in 100kHz steps
  • Microprocessor-controlled with easy-to-use menu-based navigation
  • Standard 3-pin XLR jack can accept mic, line, Clear Com, RTS1, and RTS2 signals
  • Output power of 250mW for long range transmission, BNC antenna included
  • Built-in mic preamp
  • Pilot tone squelch control
  • Frequency scrolling with Tx mute
  • Easy-to-read LCD Display
  • Compact and rugged aluminum housing
Operating Frequency 563.2 to 588.7MHz
Frequencies 256 Channels Per Block
Channel Spacing 100kHz
Spurious and Harmonic Suppression 37dBc Above 1GHz
Frequency Stability ±0.001% (10 ppm) @ 25°C
Temperature Stability ±0.001% (10 ppm) @ -30 to +50°C
Compatibility Modes IFB, Digital Hybrid Wireless (400 Series), 100 Series, 200 Series, Mode 3, Mode 6
Pilot Tone 29.997kHz IFB Mode, 32.765kHz 200 Mode, 400 Mode Step Selected, 32.768kHz Mode 6
Modulation FM, ±20kHz Deviation IFB & 100 Mode, ±75kHz 200 & 400 Mode, ±50kHz Mode 3 and Mode 6
Audio Frequency Response 100Hz - 8kHz, ±1dB IFB Mode
30Hz - 20kHz, ±1dB 200 & 400 Mode
Low Frequency Roll-Off 3dB Down @ 35 or 50Hz, Menu Selectable
Signal to Noise Ratio 90dB Typical, A-Weighted
RF Power Output 250mW, Nominal
Output Impedance 50 Ohms
Audio Input Level Line, RTS1, RTS2: 0dBu
Clear Com: -10dBu
Mic Dry Inputs: -42dBu
Audio Input Impedance Balanced: Greater than 2 kOhms
Unbalanced: Greater than 1 kOhm
Gain -18 to +24dB, Software Selectable
Connectors 1 x XLR Input Connector
1 x BNC Antenna Connector
1 x DC Power Input
Controls and Indicators 4 x Mode Switches (For Selecting Type of Input Source)
1 x Menu Button
2 x Select Buttons (Up/Down)
1 x Off/Tune/Xmit Switch
1 x Backlit LCD Display
Power 12-14VDC, Typical, 200mA Max
Dimensions (LxWxH) 5.25 x 3.25 x 1.25" (133 x 83 x 32mm)
Weight 9 oz (255g)

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Prices and specifications subject to change without notice.