Lectrosonics IFBR1B UHF Multi-Frequency Beltpack IFB Receiver

Share

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 audio during a production. The IFBR1B receiver provides simplicity and flexibility in a package that is intuitive for any user to operate. In spite of its tiny size, the 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.

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 result from a resistive circuit design. The headphone cable doubles as the receiving antenna.

The IFBR1B receiver will drive a wide variety of earbuds, headphones and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms. It operates on a single 3.6 V rechargeable LB-50 Li-ion battery that will provide about eight hours of operation per charge. The LED indicator changes color from green to red as the battery voltage declines to provide plenty of warning before operation ceases. Inside the battery door is a USB port for firmware updates in the field.

Housed in a rugged machined aluminum package, the IFBR1B comes with a wire beltclip that provides secure mounting on a wide variety of belts, pockets and fabrics.

Lectrosonics IFBR1B Receiver - 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

• Operating Frequencies (MHz):
  • Band A1 (Blue Knob): 470.100 - 537.575
  • Band B1 (Blue Knob): 537.600 - 614.375
  • Band C1 (Blue Knob): 614.400 - 691.175
  • Block 941 (Black Knob):
    • 941.525 - 951.975
    • 953.025 - 956.22
    • 956.475 - 959.825
• 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: > 70 dB
• Third Order Intercept: 0 dBm
• Frequency Response: 100 Hz to 10 kHz, (± 1db)
• Audio Output: 1V RMS into 50 Ohms minimum
• Antenna: headphone cable
• Programmable Memory: 10 frequencies can be stored as presets
• Controls:
  • Top Panel: Single knob controls Audio Output Level, 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
• Dimensions (H x W x D): 2.8 x 2.4 x 0.8 in | 71.1 x 70 x 20.3 mm
• Weight: 3.4 oz | 96.4 g with battery and wire belt clip