Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470)

Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470)

Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470)

B&H # LEIFBT4470 MFR # IFBT4-470
Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470)

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Expected availability: 7-10 business days 
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Product Highlights

  • For Broadcast/Movie/Theater/Stage Use
  • Extended Operating Range
  • For Standalone Or Intercom System Use
  • Patented Digital Hybrid Wireless System
  • 256 UHF Frequencies In 100kHz Steps
  • High-Contrast Multifunction LCD Display
  • Rugged Machined Aluminum Construction
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  • 1Description
The IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470) from Lectosonics combines high-quality audio with an extended operating range to provide accurate and reliable sound transmission. In addition to serving as a standalone device, it can also be patched directly into many intercom systems. The transmitter uses Lectrosonics' Digital Hybrid Wireless System to transmit data to the receiver, combining the best of both analog and digital transmission.

The transmitter is easy to use and program on the fly, thanks to the high-contrast LCD that is visible even in sunlight. Its machined aluminum construction ensures durability so the transmitter will last many years, even in the most demanding environments.

Digital Hybrid Wireless Technology

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

256 UHF Frequencies In 100kHz Steps

256 UHF frequencies in 100kHz steps provide exceptional flexibility in coordinating frequencies in multi-channel wireless systems and avoiding interference from external RF signal sources and noise

Microprocessor-Controlled Operation

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

250mW Power Output For Long-Range Use

The transmitter delivers 250mW of output power which, when used with an efficient antenna, provides exceptional operating range with the R1A belt-pack 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

Pilot Tone Squelch Control

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
Multi-use XLR input jack
Built-in microphone preamp

DIP Switch Programmable Intercom Input

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 to allow direct connection to dynamic microphones in "standalone applications. Direct output at studio line level can also be fed directly into the transmitter
Tx mute for frequency scrolling

Multi-Function LCD Display

The LCD display is backlit for use in dimly lit conditions and is also highly visible in direct sunlight

Rugged Machined Aluminum Construction

The transmitter housing is rugged, machined aluminum with an electrostatic powder coating and an anodized finish. The unit is powered by 6 to 18 Volts DC via a locking connector. The supplied whip antenna is a detachable, locking 1/4 wavelength flexible, galvanized steel cable that connects to a 50 Ohm BNC connector on the rear panel
In the Box
Lectrosonics IFBT4 Frequency-Agile Compact IFB Transmitter (Block 470)
  • 1-Year Limited Warranty
  • Table of Contents
    • 1Description
    Frequencies 256 channels/block
    Channel Spacing 100kHz
    RF Power Output 250 mW
    Spurious and Harmonic Suppression 37 dBc above 1 GHz
    Frequency Stability ±0.001% (10 ppm) at 77 °F (25 °C)
    Temperature Stability ±0.001% (10 ppm) from -22 to 122 °F (-30 to 50 °C)
    Channel Selection Momentary pushbutton switches, tune up and down
    Compatibility Modes Digital Hybrid Wireless (400 Series), 100 Series, 200 Series, Mode 3, Mode 6, and IFB
    Pilot Tone IFB & 100 Mode: 29.997kHz
    200 Mode: 32.765kHz
    400 Mode: step selected
    Modulation FM - IFB & 100 MODE: ±20kHz deviation
    FM - 200 & 400 MODE: ±75kHz
    Audio Frequency Response IFB MODE System Response: 100 Hz to 8kHz, ±1 dB
    200 & 400 MODE System Response: 30Hz to 20kHz, ±1 dB
    Low Frequency Roll-Off Menu selectable for 3 dB down at 35 Hz or 50 Hz
    Signal-to-Noise Ratio 90 dB typical ("A" weighted)
    Audio Compression IFB/100/200 Mode: 2 to 1
    Output Impedance 50 Ohms
    Audio Input Level Line, RTS1 & RTS2: 0 dBu
    Clear Com: -10 dBu
    Mic Dry Inputs: -42 dBu (no phantom power)
    Max: ±50 V dc
    Audio Input Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, & Clear Comm
    Audio Input Impedance Balanced: > 2 K (at any gain setting)
    Unbalanced: > 1 K (at any gain setting)
    Gain Control -18 to 24 dB (0 dB nominal center)
    Audio Input Jack Standard XLR female connector
    Input Power Typical: 12 to 14 V DC
    Maximum: 200 ma
    Maximum Input Range: 6 to 18 V DC
    Power Input Connection: Coax type, locking LZR RL26AE
    Indicators MENU momentary push-button switch
    Power OFF-TUNE-XMIT, 3 position slide switch
    Select Up momentary push-button switch
    Select Down momentary push-button switch
    Controls Rear Panel: Input Mode Select, 4 section DIP switch
    Dimensions (L x W x H) 5.25 x 3.25 x 1.25" (13.34 x 8.26 x 3.18 cm)

    Length includes connectors

    Weight 9.0 oz (255.15 g)
    Packaging Info
    Package Weight 3.4 lb
    Box Dimensions (LxWxH) 14.0 x 10.5 x 4.0"

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