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 memory
• LCD interface for programming and operation
• High sensitivity for extended operating range indoors or outdoors
• USB port for firmware updates
• Compact, rugged machined aluminum housing
• Attached battery door
• 8+ hours battery life with removable LB-50 Li-ion
Specifications:
Operating Frequencies (MHz):
• 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
• Frequency Selection Steps: 25 kHz or 100 kHz, selectable; VHF: 125 kHz
• Sensitivity: 1 uv (20 dB SINAD)
• Signal/Noise ratio: 95 dB A-weighted
• Squelch quieting: 90 dB
• AM rejection: 50 dB, 10 uV to 100 mV
• Modulation acceptance: ±20 kHz
• Spurious rejection: Greater than 70 dB
• Operating temperature range: -20 to 45 degrees C.
• Third order intercept: 0 dBm
• Frequency response: 100 Hz to 10 kHz, (+/-1 dB)
• Audio output: 1V RMS into 50 ohms minimum
• Antenna: Headphone cable
• Min. headphone impedance: 16.0 Ohms
• Programmable memory: 10 frequencies can be stored as presets
Controls:
• 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 status
• Battery: LB-50 Li-ion 3.6 V 1000 mAH
• Battery Life: 8 hours per charge with LB-50 Li-ion battery
• Current consumption: 120 mA
• Weight: 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)
