This product is discontinued and the information here is only for reference. It has been replaced by the LR-5200-IR
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IR Stethoscope 4-Channel Receiver (Discontinued)

Item:LR-42
Discontinued

Compatible with a wide range of transmitters, the LR-42 stethoscope receiver from Listen Technologies gives venues a reliable and user-friendly receiver option. Each unit can use either AAA alkaline or NiMH rechargeable batteries, providing users with up to 30 hours of clear, reliable audio performance. The built-in auto shutoff feature helps to extend that battery life by turning the unit off after 30 minutes of not receiving an audio signal.

The LR-42 stethoscope receiver is capable of receiving up to four (4) channels of audio in either mono or stereo, making it a compact and reliable solution for assistive listening needs including language interpretation, live theater, houses of worship, courtrooms, and a wide range of other venues.

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Includes

One (1) LR-42 IR Stethoscope 4-Channel Receiver
One (1) LA-152 IR Receiver Battery Compartment (Non-Charging)
One (1) Quick Reference Card

Highlights

  • Secure and reliable infrared audio for applications where isolated signals or security is a matter of importance
  • Stylish, all-in-one stethoscope design makes each unit easy to wear and easy to use
  • Receives up to four (4) channels of crystal-clear audio in either stereo or mono
  • Compatible with standard AAA alkaline or NiMH rechargeable batteries for up to 30 hours of listening
  • Auto shutoff feature extends battery life by powering the receiver off after 30 minutes
  • Comfortable, replaceable ear pieces for easy cleaning and maintenance

Specs

+Audio

Frequency Response63 Hz - 15 kHz (+/- 3 dB)
Signal-to-Noise RatioMono: > 60 dBStereo: > 52 dB
System Distortion< 2% total harmonic distortion (THD)
Audio Output JacksBuilt in Stethoscope speakers
Audio Output Power20 mW maximum at 32 ohms

+Controls

User ControlsVolume, Power, Channel Select
ProgrammingChannel Lock, Auto Seek, Channel Lock-Out, Squelch

+Indicators

Unit PowerIndicated by current channel selection LED
Channel SelectionRed LED illuminates on the current channel selection

+RF

Carrier Frequencies2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
Number of ChannelsFour (4) selectable channels
IR DetectorsTwo (2) detectors under front IR lens
SensitivityOne (1) nW/cm2 at 40 db SNR
Frequency Accuracy+/- .005% stability 0 to 50C
SquelchAutomatic on loss of RF signal (40 dB SNR)

+Power

Battery TypeTwo (2) AAA alkaline batteries or NiMH battery pack
Battery Life30 hours alkaline, 15 hours NiMH rechargeable pack (LA-364)
Battery Charging TimeFully Automatic with NiMH battery pack and LA-350 charger

+Physical

Width4.00 in. (102 mm)
Height1.80 in. (46 mm)
Depth.75 in. (19 mm)
LengthStethoscope Arm length 8 in. (203 mm)
ColorDark Grey with White Silk Screening
Unit Weight with Batteries2.95 oz. (85 g)
Shipping Weight1.0 lb. (0.5 kg)
Weight2.15 oz. (60 g)

+Environmental

Temperature - Operation14 ?F (-10 ?C) to 104 ?F (+40 ?C)
Temperature - Storage-4 ?F (-20 ?C) to (122 ?F)
Relative Humidity0 to 95% relative humidity, non-condensing

+Compliance

StandardsFCC Part 15, Industry Canada, CE, RoHS

FAQs

+How does the receiver know if the signal is mono or stereo?

It automatically detects the type of signal and responds accordingly.

+My stereo signals are a bit noisy. How can I resolve this problem?

Add more radiators. When you are transmitting stereo signals, the signal is degraded slightly. Increasing your radiator coverage will help mitigate this.

+What happens when there is no signal from the radiators?

The receiver’s audio signal is muted and after 30 minutes the unit automatically shuts down to conserve battery life.

+How does the user select carriers?

By pressing the SELECT button on the front of the receiver.

+Can the receiver automatically find a carrier?

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.

+Can I use a mono or stereo headphone with the LR-44?

Yes.

+How many receivers can be used in a system?

Infinite number - there is no limit.

+How do you replace the batteries in the receiver?

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.

+How do I recharge the NiMH batteries?

Use the Listen LA-350 8-Unit Charging/Storage unit. This unit will charge batteries that are in receivers or out of receivers.