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Overview

Combining powerful, crystal-clear audio performance with the ability to program each unit, the LR-500 Portable Programmable Display Receiver is a top-of-the-line solution for your assistive listening system. Our signature Look & Listen (TM) LCD display gives you and your users a quick, easy way to check the programming status, channel selection, battery level, signal strength, and more. And Listen Technologies’ SmartCharge (TM) system built into each unit helps to prevent overcharging (when used with NiMH rechargeable AA batteries).

Easy to use and easy to program, the LR-500 is approved for assistive listening use in the U.S. by the FCC and offers you an industry-leading option for meeting the needs of your visitors or customers.

Includes

One (1) LR-500-072  Portable Programmable Display FM Receiver (72 MHz)
One (1) Owner’s Manual (72 MHz)

 

Highlights

  • Compact, portable, and programmable digital receiver
  • Can receive up to 17 wide-band or 40 narrow-band channels
  • Easy-to-read LCD display with programming status, battery level, channel lock, and signal strength readings
  • Channel seek capabilities and channel selector buttons on the front of the unit
  • 80 dB signal-to-noise ratio for industry-leading sound quality
  • Built-in SmartCharge feature prevents overcharging
  • Simple drop-in charging compatible with Listen Technologies’ charging cases and plugs
  • Compatible with mono and stereo headphones
  • Uses standard AA alkaline or NiMh rechargeable batteries
  • Limited lifetime warranty and hassle free support from Listen Technologies
Configurations & Architectural Specs

Configurations

LR-500-072 Portable Programmable Display RF Receiver (72 MHz)
LR-500-216 Portable Programmable Display RF Receiver (216 MHz)

Architectural Specs

The RF receiver shall be capable of receiving on 57 wide and narrow band channels.The receiver shall have a SNR of 80 dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seeking channels. The device shall have a squelch. The device shall have an audio frequency response of 50 Hz to 15 KHz, ‘± 3 dB at 72 MHz and 50 – 10 kHz (‘±3dB) at 216 MHz. The device shall incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to audio normally. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, RF signal strength and channel lock status. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The device shall have a switch able option for the use of (2) alkaline or (2) NiMH batteries. The Listen LR-500-072 or LR-500-216 is specified.
Product Specifications
Specification LR-500-072

Audio

Frequency Response 50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio SQ enabled: 80dB; SQ disabled 60dB
Audio Output Jacks 3.5mm connectors, unbalanced, 0dBu nominal output level, 16mW maximum, impedance 32 Ohms
Distortion < 2% total harmonic distortion (THD) at 80% deviation

Controls

User Controls Channel up/down, SEEK, volume, Alkaline/NiMH batteries, SQ enable/disable
Programming Channel lock, squelch, channel lock out

Indicators

LCD Channel Designation, lock status, signal strength indication, programming
LEDs Red, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when locked and SEEK is pushed.

RF

Frequency Range 72.025 - 75.950 MHz
Number of Channels 17 wide band, 40 narrow band
Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50ºC)
Squelch Programmable in 20 steps, automatic on loss of RF signal
Antenna Type Uses earphone cable

Power

Power Supply I/P 120VAC; O/P 7.5VDC 250 mA; Drop in contact points for use with charging cases. Power supply not included (LA-208)
Power Supply Connector 2.3mm OD by 0.7mm ID, barrel type connector 7.5 VDC, center positive < 250mA. Drop in contact points for use with Listen charging cases
Battery Type Two AA batteries, alkaline or NiMH
Battery Life 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging Time Fully automatic, 13 hours
Compliance RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant

Physical

Width 5.00 in. (13.0 cm)
Height 3.00 in. (7.6 cm)
Depth 1.00 in. (2.5 cm)
Color Dark Grey with white silk screening
Unit Weight with Batteries 5.8 oz (164 g)
Shipping Weight 1.0 lbs. (0.5 kg)
Weight 3.9 oz (111 g)
Door Manually Lockable. Up, down, and power buttons through door. Other controls behind door (see controls)

Environmental

Temperature - Operation 14 to 104º F (-10 to 40º C)
Temperature - Storage -4 to 122° F (-20 to 50° C)
Relative Humidity 0 to 95% relative humidity, non-condensing

Compliance

RF FCC Part 15, Industry Canada
Requirements
Used With
Accessories
FAQ
Q What is the warranty of Listen receivers?
A Limited lifetime warranty. The following cases will void the warranty: -Misuse, dropping, or any other noticeable cosmetic damage. -Charging alkaline batteries instead of NiMH. -Overheating the charging process by closing the lid on the charging case
Q What is the function of SQ?
A To reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have SQ on to achieve the desired results. If you are planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.
Q What is the difference between the LR-400 and the LR-500?
A The LR-500 gives the user an opportunity to lockout unused channels and has the controls on the outside of the front door.
Q Can the LR-500 be used with multiple transmitters?
A Yes. We recommend the LR-500 for use with multiple transmitters. The LR-500 is programmable and can be set to just those channels you need.
Q How many receivers can I have in a system?
A As many as you need, the number is endless.
Q How many channels can I program into the LR-500?
A One to 57. The receiver has 57 channels and you can program it to have just the channels you want to access. It can be a two channel receiver, a 12 channel receiver, or keep all channels.
Q How long do the batteries last on the LR-500 receiver?
A Alkaline batteries last 30 hours. NiMH rechargeable batteries last 15 hours (72 MHz and 216 MHz). With 863 MHz, Alkaline batteries last 20 hours and NiMH rechargeable batteries last 10 hours.
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