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. 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 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 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. The IFBR1B is housed in a rugged machined aluminum package. A wire beltclip is included and provides a secure mounting on a wide variety of belts, pockets and fabrics.
Available frequency bands for the IFBR1B:
A1 (Blue knob): 470-537 MHz (uses the IFBT4-470, 19, or 20)
B1 (Blue knob): 537-614 MHz (uses the IFBT4-21, 22 or 23)
941 (Black knob): 941-960 MHz (uses the IFBT4-944)
VHF (Red knob): 174-216 MHz (uses the IFBT4-VHF)
(1) IFBR1B Receiver (Available in VHF, A1, B1, and 941 bands)
(1) LB-50 Rechargeable Battery
(1) 40117 Dual-Bay Charger for IFBR1B