• IFBT4 compact IFB transmitter front panel angled view with backlit green LCD, SELECT up/down buttons, MENU button and OFF/TUNE/XMIT slide switch, Lectrosonics
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Lectrosonics IFBT4 IFB Transmitter Compact Frequency-Agile Wireless Tx | Block 470

Lectrosonics IFBT4 IFB Transmitter Compact Frequency-Agile Wireless Tx | Block 470

SoundPro Item: 200140 | Part Number: IFBT4-UHF-block 470

$1,499.00
$1,664.00 $1,499.00
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MSRP: $1,664.00 | MAP: $1,499.00

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  • Digital Hybrid Wireless Technology Ensures Compatibility With Multiple Lectrosonics Receiver Generations
  • Machined Aluminum Housing Withstands Daily Production And Touring Environments
  • Multi-Use XLR Input With Built-In Mic Preamp Handles Diverse Feed Sources Without External Adapters
  • DIP Switch Programmable Intercom Input Supports Line, Mic, RTS, And Clear-Comm Configurations
  • Tx Mute For Frequency Scrolling Allows Retuning Without Interrupting Connected Receivers
  • Backlit LCD Displays Modulation, Frequency, Mode, And Audio Level For Fast On-Set Monitoring
  • Menu-Selectable Low-Frequency Rolloff Optimizes IFB Intelligibility For Voice-Critical Applications
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The Lectrosonics IFBT4 is a frequency-agile IFB base station transmitter built for broadcast, film, and live production environments where talent monitoring and director cue delivery are critical. Available across UHF and VHF frequency blocks to suit different spectrum plans and regional licensing requirements, the IFBT4 integrates into existing Lectrosonics wireless ecosystems and supports compatibility modes including IFB, Nu Hybrid, and Digital Hybrid Wireless, making it a practical choice for facilities that operate mixed-generation gear.

Designed for the demands of daily production use, the IFBT4 accepts a wide range of intercom input configurations including Line, Mic, RTS, and Clear-Comm via its rear-panel DIP switch, eliminating the need for external adapters in most intercom wiring scenarios. The built-in microphone preamp and multi-use XLR input make it adaptable to both simple playback feeds and full two-way production workflows. A backlit LCD displays modulation, frequency, mode, and audio level at a glance, while momentary pushbutton channel selection and TX mute allow frequency scrolling without dropping the feed.

Where many compact IFB transmitters sacrifice build quality for size, the IFBT4 uses rugged machined aluminum construction sized to mount in a production rack or fit a portable bag kit. Its menu-selectable low-frequency rolloff, wide gain control range, and high signal-to-noise ratio make it suitable for demanding audio environments where IFB intelligibility directly affects on-air performance.

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Specifications

RF Performance
Operating Frequencies (MHz)
Block 470: 470.100 - 495.600
Channel Spacing
100 kHz (0.1 MHz)
RF Power Output
US, X: 250 mW; E01: 50 mW
Frequency Stability
+/-.001% (10 ppm) @ 25 degrees C
Temperature Stability
+/-.001% (10 ppm) from -30 degrees C to +50 degrees C
Spurious Radiation (US)
Compliant with ETSI EN 300 422-1 v1.4.2
Spurious Radiation (E01)
37 dBc above 1 GHz
Emission Designator
110KF3E
Output Impedance
50 ohms
Pilot Tone
Pilot Tone (US)
25 to 32 kHz; 3.5 kHz deviation (Nu Hybrid mode)
Pilot Tone (E01)
29.997 kHz; 2 kHz deviation (IFB Mode), 25 to 32 kHz (Digital Hybrid Mode)
Pilot Tone (X)
29.997 kHz IFB & 100 MODE, 32.765 kHz 200 MODE, 400 MODE step selected
Compatibility
Compatibility Modes (US)
Mode 3, IFB and Nu Hybrid
Compatibility Modes (E01)
IFB, Digital Hybrid Wireless (400 Series)
Compatibility Modes (X)
Digital Hybrid Wireless 400 Series, 100 Series, 200 Series, Mode 3, Mode 6, and IFB
Channel Selection
Momentary pushbutton switches, TUNE Up and Down
Audio
Frequency Response (IFB Mode)
100 Hz to 8 kHz, +/-1 dB
Frequency Response (Nu Hybrid Mode)
30 Hz to 20 kHz, +/-1 dB
Rolloff
Menu selectable, 3 dB down at 35 Hz or 50 Hz
Signal To Noise Ratio
90 dB typical (A-weighted)
Gain Control Range
-18 dB to +24 dB (0 dB nominal center), Menu selectable
Audio Input Levels
0 dBu (Line, RTS1, RTS2); -10 dBu (Clear-Com); -42 dBu (mic dry, no phantom power); +/-50 Vdc max
Audio Input Config
Balanced and Unbalanced, rear panel selectable: Line, Mic, RTS 1, RTS 2, Clear-Comm
Audio Input Impedance
Greater than 2 K ohms balanced; greater than 1 K ohms unbalanced
Audio Input Jack
Standard XLR female connector
Power
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
Controls
Front Panel Controls
MENU momentary pushbutton; Power OFF-TUNE-XMIT 3-position slide switch; Select UP momentary pushbutton; Select DOWN momentary pushbutton
Rear Panel Controls
Input Mode Select, 4-section DIP switch
Indicators
Backlit LCD displaying modulation meter, frequencies, modes, rolloff, audio level, and tuning groups
Dimensions
Size
5.25" L (including connectors) x 3.25" W x 1.25" H (133.35 x 82.55 x 31.75 mm)
Weight
Weight
9.6 oz (272 g)

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