Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production. In other cases, the IFB system is used by directors and other management to monitor program audio during a production. The IFBR1B receiver provides simplicity and flexibility in a package that is intuitive for untrained users to operate. In spite of its tiny size, the new IFBR1B receiver offers excellent performance on par with all of Lectrosonics IFB products.The design uses +/-20 kHz FM deviation for efficient use of the bandwidth, with compandor noise reduction circuitry for an excellent signal to noise ratio. A supersonic Pilot Tone signal controls the audio output squelch to keep the receiver silent when no transmitter signal is received. The incoming RF signal is filtered and amplified, then mixed down to the IF frequency with a microprocessor controlled synthesizer.Main Features:Stores up to 10 frequency presets in memoryLCD interface for programming and operationHigh sensitivity for extended operating range indoors or outdoorsUSB port for firmware updatesCompact, rugged machined aluminum housingAttached battery door8+ hours battery life with removable LB-50 Li-ionSpecifications:Operating Frequencies (MHz):Band A1: 470.100 – 537.575Band B1: 537.600 – 614.375Band C1: 614.400 – 691.175Block 941: 941.525 – 951.975, 952.875 – 956.225, 956.475 – 959.825VHF: 174.100 – 215.750Frequency Selection Steps: 25 kHz or 100 kHz, selectable; VHF: 125 kHzSensitivity: 1 uv (20 dB SINAD)Signal/Noise ratio: 95 dB A-weightedSquelch quieting: 90 dBAM rejection: 50 dB, 10 uV to 100 mVModulation acceptance: 20 kHzSpurious rejection: Greater than 70 dBOperating temperature range: -20 to 45 degrees C.Third order intercept: 0 dBmFrequency response: 100 Hz to 10 kHz, (+/-1 dB)Audio output: 1V RMS into 50 ohms minimumAntenna: Headphone cableMin. headphone impedance: 16.0 OhmsProgrammable memory: 10 frequencies can be stored as presetsControls:Top Panel: Single knob controls Audio Output Level and Power OnSide Panel: Membrane switches with LCD interface for Frequency Selection and Preset functionIndicators: Multi-color LED indicator for power on and battery statusBattery: LB-50 Li-ion 3.6 V 1000 mAHBattery Life: 8 hours per charge with LB-50 Li-ion batteryCurrent consumption: 120 mAWeight: 3.4 oz (with battery and wire belt clip)Size: 2.8 x 2.4 x 0.8 in. (71.1 x 70.0 x 20.3 mm)