Lectrosonics IFBT4 Synthesized UHF IFB Transmitter
- Synthesized UHF IFB transmitter at 250 mW
- XLR input for line, mic, RTS, or Clear-Com
- Seven frequency blocks, 100 kHz steps
Unavailable for shipping outside the United States and Canada.
From $1,499.00 USD
Lectrosonics IFBT4 Synthesized UHF IFB Transmitter
Built for broadcast, film, theater, and stage, the Lectrosonics IFBT4 is a synthesized UHF IFB transmitter that feeds cues and program audio to belt-pack receivers at 250 mW.
IFB stands for interruptible foldback, the system that sends talent and crew their cues. DIP switches on the rear panel set the input for RTS or Clear-Com intercom lines, a dynamic mic, or studio line level, so the transmitter can stand alone or patch straight into an intercom system.
Frequency Blocks
Trew Audio carries the IFBT4 in the seven Lectrosonics frequency blocks in the table below, and each version tunes its block in 100 kHz steps.
Digital Hybrid Wireless
Digital Hybrid Wireless encodes the audio digitally and sends it over an analog FM link, which gives the range of FM without a compandor and its artifacts. A supersonic pilot tone keeps the receiver muted when the transmitter is off. The transmitter works in Nu Hybrid mode, with IFB and Mode 3 compatibility modes.
Build and Power
Microprocessor control keeps turn-on and turn-off free of pops. The output mutes in Tune mode, so scrolling to a new frequency never interferes with other wireless channels. The backlit LCD reads in dim light and in direct sun. The machined aluminum housing runs on 6 to 18 VDC through a locking connector, and the whip antenna locks onto a 50 ohm BNC jack.
Features
- 250 mW output for long range
- Tunes its block in 100 kHz steps
- Digital Hybrid Wireless with Nu Hybrid, IFB, and Mode 3
- Pilot tone squelch control
- XLR input for line, mic, RTS, or Clear-Com
- Built-in microphone preamp
- Transmitter mutes while you scroll frequencies
- Backlit multi-function LCD
- Machined aluminum housing, 6 to 18 VDC
Available Options
| Block | Frequency Range (MHz) |
|---|---|
| Block 470 | 470.100 to 495.600 |
| Block 19 | 486.400 to 511.900 |
| Block 20 | 512.000 to 537.500 |
| Block 21 | 537.600 to 563.100 |
| Block 22 | 563.200 to 588.700 |
| Block 23 | 588.800 to 607.900 |
| Block 944 | 944.100 to 951.900 |
What's Included
- CCMINI pouch
- 21586 locking power cable with pigtail
- DCR12/A5U power supply
- Transmitter whip antenna, cut to the block
- Manual
Specifications
| Transmitter | |
|---|---|
| Operating Frequencies | Block 470: 470.100 to 495.600 MHz Block 19: 486.400 to 511.900 MHz Block 20: 512.000 to 537.500 MHz Block 21: 537.600 to 563.100 MHz Block 22: 563.200 to 588.700 MHz Block 23: 588.800 to 607.900 MHz Block 944: 944.100 to 951.900 MHz |
| Channel Spacing | 100 kHz |
| RF Power Output | 250 mW |
| Pilot Tone | 25 to 32 kHz, 3.5 kHz deviation (Nu Hybrid mode) |
| Signal-to-Noise Ratio | 90 dB typical, A-weighted |
| Frequency Stability | ±0.001% (10 ppm) at 25 °C |
| Compatibility Modes | Mode 3, IFB, and Nu Hybrid |
| Emission Designator | 110KF3E |
| Audio Input | |
| Input Levels | Line, RTS1, and RTS2: 0 dBu Clear-Com: −10 dBu Dynamic mic: −42 dBu (no phantom power) ±50 VDC maximum |
| Input Configuration | Balanced or unbalanced; rear-panel selectable for line, mic, RTS1, RTS2, and Clear-Com |
| Input Impedance | Over 2 k ohms balanced, over 1 k ohms unbalanced |
| Gain Control Range | −18 to +24 dB, menu selectable |
| Frequency Response | IFB mode: 100 Hz to 8 kHz, ±1 dB Nu Hybrid mode: 30 Hz to 20 kHz, ±1 dB |
| Low-Frequency Roll-Off | Menu selectable, 3 dB down at 35 or 50 Hz |
| Audio Input Jack | XLR female |
| Power and Physical | |
| Input Power | 12 to 14 VDC typical, 200 mA maximum; 6 to 18 VDC range |
| Power Input Jack | Coaxial, locking LZR (RL26AE) |
| Antenna Connector | 50 ohm BNC |
| Front Panel Controls | Menu button; Off, Tune, and Xmit slide switch; Select up and down buttons |
| Rear Panel Controls | 4-section DIP switch for input mode |
| Weight | 272 g (9.6 oz) |
| Dimensions (L × W × H) | 133.35 × 82.55 × 31.75 mm, including connectors 5.25 × 3.25 × 1.25 in |
| Latest Specifications | Specifications are subject to change without prior notice. For current information, visit lectrosonics.com. |
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