The 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.
Digital Hybrid Wireless? technology256 UHF frequencies in 100kHz stepsMicroprocessor controlled operation250 mW power output for long range usePilot tone squelch controlMulti-use XLR input jackBuilt-in microphone preampDIP switch programmable intercom inputTx mute for frequency scrollingMulti-function LCD displayCompact size for use anywhereRugged machined aluminum construction
Block 470: 470.100 - 495.600Block 19: 486.400 - 511.900Block 20: 512.000 - 537.500Block 21: 537.600 - 563.100Block 22: 563.200 - 588.700Block 23: 588.800 - 607.900, 614.100 - 614.300Block 24: 614.400 - 639.900Block 25: 614.400 - 639.900Block 26: 665.600 - 691.100Block 27: 691.200 - 716.700*Block 28: 716.800 - 742.300*Block 29: 742.400 - 767.900*Block 944: 944.100 - 951.900*export only
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 Series200 SeriesMode 3Mode 6and 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 dBIFB MODE system response (see Rolloff)30Hz to 20kHz ±1dB200 & 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 switchPower OFF-TUNE-XMIT, 3 position slide switchSelect Up momentary pushbutton switchSelect 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
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