Overview

Compatible with the Listen Technologies line as well as other infrared transmitter systems, the LR-44 IR Lanyard 4-channel receiver is designed for comfortable wear and convenient device management. Capable of receiving up to four channels of audio in either mono or stereo, the LR-44 provides listeners with clear, high-performance audio in a compact unit. The LR-44 is compatible with standard AAA alkaline (up to 30 hours of use) and rechargeable NiMH batteries (up to 15 hours of use per charge), giving you a flexible solution for making your assistive listening system available to all who might need it.

Ideal for a range of assistive listening needs, from live theater and houses of worship to courtrooms, language interpretation, secure rooms and more, the LR-44 offers a simple and affordable receiver solution.

Includes

One (1) LR-44 IR Lanyard 4-Channel Receiver
One (1) LA-152 IR Receiver Battery Compartment (Non-Charging)
One (1) Quick Reference Card

Highlights

  • Crystal-clear reception and audio performance across four (4) channels (mono or stereo)
  • Compact design and adjustable lanyard for comfort and ease of use
  • Ideal for spaces or applications where privacy and security are a concern
  • Works with standard AAA alkaline batteries or the Listen NiMH rechargeable battery pack
  • Auto shutoff feature extends battery life
  • Compatible with the Listen Technologies line of infrared systems as well as other transmitters
Configurations & Architectural Specs

Architectural Specs

The Lanyard IR Receiver shall be capable of receiving on four (4) carriers (2.3, 2.8, 3.3, 3.8 MHz) and the channel shall be displayed on one (1) of four (4) front panel LEDs. The receiver will accept mono or stereo earphones with a 3.5mm connector. The receiver shall be capable of being locked on a channel. The receiver shall be capable of receiving a stereo signal on each of the four carriers. The receiver shall have a SNR of 60 dB or greater and have built in squelch control. The device shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db and shall have distortion of less than 2%. The device shall operate for 30 hours with two AAA alkaline batteries and 15 hours with two AAA NiMH rechargeable batteries. The LR-44 is specified.

Product Specifications
Specification LR-44

Audio

Frequency Response 63 Hz - 15 kHz (+/- 3 dB)
Signal-to-Noise Ratio Mono: > 60 dBStereo: > 52 dB
System Distortion < 2% total harmonic distortion (THD)
Audio Output Jacks 3.5 mm connector unbalanced, mono or stereo headphones
Audio Output Power 20 mW maximum at 32 ohms

Controls

User Controls Volume, Power, Channel Select
Programming Channel Lock, Auto Seek, Channel Lock-Out, Squelch

Indicators

Unit Power Indicated by current channel selection LED
Channel Selection Red LED illuminates on the current channel selection

RF

Carrier Frequencies 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
Number of Channels Four (4) selectable channels
IR Detectors Two (2) detectors under front IR lens
Sensitivity One (1) nW/cm2 at 40 db SNR
Frequency Accuracy +/- .005% stability 0 to 50C
Squelch Automatic on loss of RF signal (40 db SNR)

Power

Battery Type Two (2) AAA alkaline batteries or NiMH battery pack
Battery Life 30 hours alkaline, 15 hours NiMH rechargeable pack (LA-364)
Battery Charging Time Fully Automatic with NiMH battery pack and LA-350 charger

Physical

Width 4.00 in. (102 mm)
Height 1.80 in. (46 mm)
Depth 1.0 lb. (454 g)
Color Dark Grey with White Silk Screening
Unit Weight with Batteries 2.55 oz. (74 g)
Shipping Weight 1.0 lbs. (0.5 kg)
Weight 1.75 oz. (49 g)

Environmental

Temperature - Operation 14 F (-10 C) to 104 F (+40 C)
Temperature - Storage -4 F (-20 C) to (122 F)
Relative Humidity 0 to 95% relative humidity, non-condensing

Compliance

Standards FCC Part 15, Industry Canada, CE
Requirements
Used With
Accessories
FAQ
Q My stereo signals are a bit noisy. How can I resolve this problem?
A Add more radiators. When you are transmitting stereo signals, the signal is degraded slightly. Increasing your radiator coverage will help mitigate this.
Q Can I use a mono or stereo earphone with the LR-44?
A Yes.
Q How does the receiver know if the signal is mono or stereo?
A It automatically detects the type of signal and responds accordingly.
Q What happens when there is no signal from the radiators?
A The receiver’s audio signal is muted and after 30 minutes the unit automatically shuts down to conserve battery life.
Q How does the user select carriers?
A By pressing the SELECT button on the front of the receiver.
Q Can the receiver automatically find a carrier?
A Yes, it will automatically seek and find all available carriers when the power is turned on. If no carrier is found, the unit will stop on the last used channel.
Q How many receivers can be used in a system?
A Infinite number - there is no limit.
Q How do you replace the batteries in the receiver?
A For non-rechargeable batteries (AAA alkaline), remove the battery compartment and replace the batteries with fresh AAA alkaline batteries. For rechargeable NiMH batteries, simply replace the sealed battery pack with a freshly charged pack.
Q How do I recharge the NiMH batteries?
A Use the Listen LA-350 8-Unit Charging/Storage unit. This unit will charge batteries that are in receivers or out of receivers.
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