The IFBR1C receiver provides excellent performance with simplicity and flexibility in an extremely compact package that is intuitive for untrained users to operate. 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 design uses +/-20 kHz FM deviation for efficient use of the bandwidth, with a compandor noise reduction circuitry for an excellent signal to noise ratio. A ultrasonic Pilot Tone signal controls the audio output squelch to keep the receiver silent when no transmitter signal is being 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 audio 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 receiver will drive a wide variety of earbuds, headphones, and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms. The receiver operates on AA batteries that will provide more than 12 hours of operation. 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.
The IFBR1C is housed in a durable, injection molded package. An attached beltclip is included and provides a secure mounting on a wide variety of belts, pockets and fabrics.
Starting in 2017, the 617-652 MHz and 663-698 MHz frequencies are being transitioned by the Federal Communications Commission (FCC). Users of wireless microphone devices that operate in any portion of those frequencies must cease operating on these frequencies no later than July 13, 2020. In addition, users of this device may be required to cease operations earlier than that date if their operations could cause harmful interference to a 600 MHz service licensee’s wireless operations on these frequencies. For more information, visit the FCC’s wireless microphone website at www.fcc.gov/wireless-microphones-guide or call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC).
Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device.
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