Lectrosonics IFBR1B (VHF: 174.100 - 215.750)
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 intui- tive 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 circuit- ry 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.
If a monaural earpiece is connected, this condition is automatically accommodated, with no loss of audio output power or battery life. Full output power is available with either type of connector, without the power losses that re- sult from a resistive circuit design. The headphone cable doubles as the receiving antenna.
The receiver will drive a wide variety of earbuds, head- phones and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms.
Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
Block 941: 941.525 - 951.975, 952.875 - 956.225, 956.475 - 959.825
VHF: 174.100 - 215.750
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-ionDock chargeable with optional CHSIFBR1BPilot tone squelchCompandor noise reduction
Frequency Selection Steps: Sensitivity: 25 kHz or 100 kHz, selectable; VHF: 125 kHzSignal/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 On
Side Panel: Membrane switches with LCD interface for Frequency, Selection and Preset function
Indicators: 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
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