Lectrosonics IFB T4 Wireless 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.

Digital Hybrid Wireless™ technology
256 UHF frequencies in 100kHz steps
Microprocessor controlled operation
250 mW power output for long range use
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

Operating Frequencies (MHz)
Block 21	537.600 - 563.100
Block 22	563.200 - 588.700
Block 23	588.800 - 607.900 614.100 - 614.300
Block 24	614.400 - 639.900
Block 25	640.000 - 665.500
Block 26	665.600 - 691.100
Block 27	691.200 - 716.700
Block 28	716.800 - 742.300
Block 29	742.400 - 767.900
Block 944	944.100 – 951.900
Frequencies (Channels per block)	256
Channel Spacing	100 kHz (0.1 MHz)
RF Power Output	250 mW
Spurious & Harmonic Suppression	37 dBc above 1 GHz
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 (6) Digital Hybrid Wireless(tm) (400 Series),100 Series, 200 Series, Mode 3, Mode 6, and IFB
Pilot Tone	29.997 kHz IFB & 100 MODE, 32.765kHz 200 MODE, 400 MODE step selected
Modulation	FM, ±20 kHz deviation IFB & 100 MODE, ±75kHz 200 & 400 MODE
Audio Frequency Response	100 Hz to 8 kHz, ±1 dB, IFB MODE system response (see Rolloff)30Hz to 20kHz ±1dB , 200 & 400 MODE system response (see Rolloff)
Rolloff	Low frequency audio rolloff is Menu selectable for 3 dB down at 35 Hz or 50 Hz.
Signal to Noise Ratio	90 dB typical (“A" weighted)
Audio Compressor	2 to 1 IFB, 100, and 200 Mode
Output Impedance	50 ohms
Audio Input Levels	• 0 dBu for Line, RTS1 & RTS2 • -10 dBu for Clear Com • -42 dBu for mic dry inputs (no phantom power) • +/-50Vdc max
Audio Input Config	Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Comm
Audio Input Impedance	Greater than 2 K balanced, greater than 1 K unbalanced at any gain setting
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 6 to 18 VDC
Power Input Jack	Coax type, locking LZR RL26AE
Indicators	Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, rolloff, audio level,and tuning groups.
Front panel controls	• MENU momentary pushbutton switch • Power OFF-TUNE-XMIT, 3 position slide switch • Select Up momentary pushbutton switch • Select down momentary pushbutton switch
Rear panel controls	Input Mode Select, 4 section DIP switch
Weight	9 ozs.
Size	5.25" L (including connectors) x 3.25" W x 1.25" H
Emission designator	180KF3E

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.

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