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 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 470: 470.100 - 495.600
Block 19: 486.400 - 511.900
Block 20: 512.000 - 537.500
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: 614.400 - 639.900
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
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)
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