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IFBT4
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| Frequency Agile IFB Transmitter
The Lectrosonics IFBT4 transmitter was designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. The transmitter 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.
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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.
256 UHF frequencies in 100kHz steps provide exceptional
flexibility in coordinating frequencies in multi-channel
wireless systems and avoiding interference from external RF signal sources and noise.
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. In the XMIT mod e, the output is turned on and the frequency cannot be changed.
The transmitter delivers 250 mW of output power which, when used with an efficient antenna, provides exceptional
operating range with the R1A belt-pack receiver. Indoors, the signal will penetrate various surfaces and reflect from others efficiently to extend operating range and reduce the need for critical antenna positioning.
A supersonic pilot tone signal controls the audio squelch on the R1A receiver to eliminate noise when the transmitter
is turned off and it prevents the receiver from locking onto false signals. The pilot tone also eliminates noise in the receiver at turn-on and turn-off.
The LCD display is backlit for use in dimly lit conditions and is also highly visible in direct sunlight.
DIP switch settings on the rear panel provide direct compatibility
with RTS and Clear Com intercom systems. A preamp stage is also included in the input stage to allow direct connection to dynamic microphones in "stand-alone" applications. Direct output at studio line level can also be fed directly into the transmitter.
The transmitter housing is rugged, machined aluminum with an electrostatic powder coating and an anodized finish.
The unit is powered by 6 to 18 Volts DC via a locking connector. The supplied whip antenna is a detachable, locking 1/4 wavelength flexible, galvanized steel cable that connects to a 50 Ohm BNC connector on the rear panel.
Operating frequencies:
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 and 614.100 - 614.300
Block 24 614.400 - 639.900
Block 25 640.000 - 665.500
Block 26 665.600 - 691.100
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
Specifications subject to change without notice.
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