Lectrosonics IFBR1B UHF Multi-Frequency Belt-Pack IFB Receiver

Lectrosonics IFBR1B UHF Multi-Frequency Belt-Pack IFB Receiver

Lectrosonics IFB1B UHF Multi-Frequency Belt-Pack IFB Receiver


  • 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

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. 

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 LB50 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.


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 / 953.025 - 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

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Delivery Times

Delivery times are based on when the package(s) leaves our premises. Sometimes, due to stock restrictions or a non-completed order, delivery may take longer as there is a delay with couriers, which is unfortunately out of our hands. If your order is urgent, or details change, please do let us know.
For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 30 working days of receipt (14 to initiate the process), for a full refund or for an exchange for a different product from our range. Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may affect the level of refund you receive. For full details of our returns policy, please click here.

£768.00 £1,050.00
Saving Of:  £282.00 (27%)
(£640.00 Exc. VAT)
Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  LECT-IFBR1B-B1
Part No.:  IFBR1B-B1
Manufacturer:  Lectrosonics

Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.00am - 5.00pm, to discuss these options and find out what's available to you.

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Lectrosonics IFBR1B UHF Multi-Frequency Belt-Pack IFB Receiver

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