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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.
Features:
- Block 21 Frequency 537.600 - 563.10 MHz
- 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
Block 21 537.600 - 563.100
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
Specifications subject to change without notice.
Emission designator: 180KF3E