Portable Programmable Display FM Receiver (72 or 216 MHz)
LR-500-072/216

Highlights

  • Superior Audio Quality – 80 dB signal-to-noise ratio, setting the industry’s sound quality standard.
  • A choice between 57 channels, complete antenna and accessory options make Listen products ideal for a wide range of applications.
  • Programmability – Unneeded channels can be locked so this receiver will access only one or more channels of your choice.
  • 100 % Digital – Listen receivers are digitally-tuned so transmission won’t drift; assurance that when you select a channel, it stays on the channel.
  • Uses standard alkaline or NiMH batteries.
  • Built in SmartCharge™ won’t allow batteries to overcharge. Charging circuitry is conveniently built into Listen’s receivers; never worry about unplugging a transformer at a certain time.
  • Transformer charging plug or for the ultimate convenience drop in charging contacts.
  • Limited Lifetime Warranty with hassle-free support.

Overview

One of Listen's most sophisticated receivers, the LR-500 Programmable Display Receiver offers the signature Look&ListenTM LCD Display that shows programming status, channel, lock, battery level, and RF signal strength. Channel selector buttons are easily accessible on the front of the unit. It has channel SEEK capability and is compatible with mono or stereo headsets. It takes AA batteries (alkaline or NiMH rechargeable). SmartChargeTM capabilities prevent overcharging. It's easy to use, easy to program.

Includes

LR-500 Portable Programmable Display FM Receiver
Quick Reference Card

Configurations

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

Architectural Specs

The FM 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.

CAD Drawing

    • Specifications

     SpecificationsLR-500-072LR-500-216
    RFRF Frequency Range72.025 - 75.950 MHz216.0125 - 216.9875 MHz
    Number of Channels17 wide band, 40 narrow band19 wide band, 38 narrow band
    Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
    Frequency Accuracy± .005% stability 32 to 122º (0 to 50ºC)
    AntennaUses earphone cable
    SquelchProgrammable in 20 steps, automatic on loss of RF signal
    ComplianceFCC Part 15, Industry CanadaFCC Part 90, Industry Canada
        
    Audio** All system specifications are wireless end to end**
    System Frequency Response50 Hz - 15 kHz (±3dB) 72 MHz50 - 10 kHz (±3dB) 216 MHz
    System Signal to Noise RatioSQ enabled: 80dB; SQ disabled 60dB
    System Distortion<2% total harmonic distortion (THD) at 80% deviation
    Output3.5mm connectors, unbalanced, 0dBu nominal output level, 16mW maximum, impedance 32 Ohms
      
    ControlsUser ControlsChannel up/down, SEEK, volume
    Set-up Controls (battery compartment)Alkaline/NiMH batteries, SQ enable/disable
    ProgrammingChannel lock, squelch, channel lock out
        
    IndicatorsLEDRed, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when locked and SEEK is pushed.
    DisplayChannel Designation, lock status, signal strength indication, programming
        
     Battery TypeTwo AA batteries, alkaline or NiMH
    PowerBattery Life (Listen batteries)30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
    Battery Charging (NIMH only)Fully automatic, 13 hours
    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-202)
    Power Supply Connector2.3mm OD by 0.7mm ID, barrel type connector 7.5 VDC, center positive <250mA. Drop in contact points for use with Listen charging cases
    Power Supply ComplianceRoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant
        
    PhysicalDimensions (H x W x D)3.00 x 1.00 x 5.00 in. (7.6 x 2.5 x 13.0 cm)
    ColorDark Grey with white silk screening
    Unit Weight3.9 oz (111g)
    Unit Weight with batteries5.8 oz (164g)
    Shipping Weight1.0 lbs. (0.45kg)
    DoorManually Lockable. Up, down, and power buttons through door. Other controls behind door (see controls)
        
    EnvironmentalTemperature - Operation14 to 104º F (-10 to 40º C) 
    Temperature - Storage-4 to 122° F (-20 to 50° C)
    Humidity0 to 95% relative humidity, non-condensing
        
    Specifications are subject to change without notification
     

    Requirements

    Used With

    Accessories

    Support Documents

    • Troubleshooting Guide

    My receiver won't turn ON.

    • Make sure that your batteries are installed with the correct polarity.
    • Your batteries may need to be replaced.

    I can hear some static in the audio. There is only static present.

    • The receiver is not on the correct channel. Press seek until you find the correct channel.
    • There are no transmissions in the area.
    • Make sure that the transmitter is transmitting properly.
    • The receiver is out of reception range.
    • The receiving antenna, which is the headset/earpiece cord, needs to be better oriented to pick up the signal better.

    The audio is intermittent.

    • The receiver is out of reception range.
    • The receiver is not on the correct channel. Press seek until you find the correct channel.
    • The squelch setting of the receiver needs to be set to a lower setting (Default 3). This will allow weaker signals to be heard. However, the receiver may be noisier when signals are weak.
    • The receiving antenna, which is the headset/earpiece cord, needs to be better oriented to pick up the signal better.
    • Make sure that the transmitter is transmitting properly.

    The audio sounds distorted.

    • The transmitter is being over driven. Adjust the input and mix level VU meters (front panel LED level lights) so that they are not in the red or adjust so they are barely peaking into the red. Make sure that the rear panel Input 1 and Input 2 level select switches are in the correct position.
    • The receiver is turned up all the way. Turn down the volume slightly on the receiver to avoid distortion.
    • The receiver is not on the correct channel. Press seek until you find a clean channel.
    • The receiving antenna, which is the headset/earpiece cord, needs to be better oriented to pick up the signal better.

    The audio level is very low, even at full volume

    • Adjust the input and mix level VU meters (front panel LED level lights) so that they are not in the red or adjust so they are barely peaking into the red. Make sure that the rear panel Input 1 and Input 2 level select switches are in the correct position.
    • On the transmitter, adjust the input and mix level VU meters (front panel LED level lights) so that they are not in the red or adjust so they are barely peaking into the red.
    • Your input source to the transmitter is a low level audio source. On the transmitter, the "Process" mode can be turned ON to boost the signal to an appropriate level.

    My receiver will not seek or change channels.

    • The receiver is locked. To unlock, press and hold the SEEK button for 5 seconds. The red LED on top of the unit will flash indicating the lock has been toggled and the Padlock icon will extinguish on the LCD display.
    • There are no transmissions in the area.
    • The receiver is out of reception range.

    How do I know when my batteries are low?

    • The red LED on top of the unit will begin flashing.
    • The battery icon on the LCD display will display low batteries and begin flashing when extremely low.
    • The receiver keeps turning off.

    My receiver won't charge.

    • Make sure you are using NiMH batteries.
    • Make sure the battery select switch, located in the battery compartment, is in the NiMH position.
    • Make sure that the power cord is plugged in properly.
    • If using a charging case, make sure that the receiver is properly placed in the charging pocket.

    The batteries in my receiver won't hold a charge.

    • It is time to replace the batteries. Listen recommends that the batteries be replaced every 3 years or after 500 charges.
    • Make sure that the receiver is actually receiving the charge. The red LED on top of the receiver will flash when charging.
    • Make sure that the unit is being turned off when not in use.

    How do I lock out channels?

    • Enter the program mode by holding the UP and DOWN buttons simultaneously for 5 seconds. The PGM icon will appear. Once in the program mode, scroll through the channels using the UP and Down buttons. Pressing the Seek button will toggle each channel in and out of Lockout. When a channel is locked out, L/O will be displayed on the LCD indicating that channel is locked out.

    How do I adjust squelch on my receiver? Where should I have it set?

    • Hold down the SEEK button while turning the unit ON. The receiver will enter the Squelch Mode. There are 20 available squelch settings, Default is 3. 0 is no squelch and 20 is tight squelch.

    The range of my receiver is very short.

    • The receiving antenna, which is the headset/earpiece cord, needs to be better oriented to pick up the signal better.
    • The transmitter's RF Power setting needs to be increased to Full.
    • A more efficient transmitting or receiving antenna mat be needed.

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