Portable Digital FM Receiver (72 MHz)
LR-300

Highlights

  • Superior audio quality – 80 dB signal-to-noise ratio (SNR), setting the industry’s sound quality standard.
  • 17 channels.
  • 100 % Digital – Listen receivers are digitally-tuned so the transmission won’t drift.
  • Limited Lifetime Warranty with hassle-free support.
  • Uses standard alkaline or nickel-metal hydride(NiMH) batteries.
  • Built in SmartCharge™ won’t allow batteries to overcharge. Charging circuitry is conveniently built into Listen’s receivers.
  • Drop in charging contacts for any of Listen’s many charging cases or a charging plug on the side of the unit.
  • Many accessory options make Listen products ideal for a wide range of applications.

Overview

The LR-300 Portable Digital FM Receiver is a low cost digital receiver. It has the same exceptional audio quality as Listen's full-featured receivers and the same convenient recharging options. The LR-300 utilizes the 17 most common wide band channels, with a SEEK channel selection button behind the door panel. The LR-300 does not use an LCD, but instead a multi-function LED. The LR-300 is available for use with only on the 72 MHz frequency.

Includes

(1) LR-300 Portable Digital FM Receiver
(1) Quick Reference Card

Architectural Specs

The FM receiver shall be capable of receiving on 17 wide and narrow band channels. The receiver shall have a SNR of 80 dB or greater. The device shall be able to be locked on a single channel. The unit shall incorporate a multi-functional LED that indicates power, channel lock, low battery, and battery charging. The receiver shall be capable of seeking channels. The device shall have an audio frequency response of 50 Hz - 15 kHz (±3 dB) at 72 MHz. The device shall incorporate a stereo earphone jack that allows the user to plug in either a mono or stereo earphone(s). The device shall be able to enable companding with the SQ function. The unit shall operate off of two (2) AA batteries; alkaline or NiMH. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The device shall have a switchable option for the use of alkaline or NiMH batteries. The Listen LR-300-072 is specified.

CAD Drawing

    • Specifications

     SpecificationsLR-300-072
    RFRF Channel Range72.025 - 75.975 MHz                                                                                   
    Number of Channels17 wide band,
    Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
    Frequency Accuracy± .005% stability 32 to 122 ºF (0 to 50 ºC)
    AntennaUses earphone cable
    SquelchNone
    ComplianceFCC Part 15, Industry Canada, RoHS
       
    Audio** All system specifications are wireless end to end**
    System Frequency Response50 Hz - 15 kHz (±3 dB)                                                                
    System Signal-to-Noise Ratio (A-Weighted)SQ enabled 80 dB, SQ disabled 60 dB
    System Distortion<2% total harmonic distortion (THD) at 80% deviation
    Output3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level,                           16 mW maximum, impedance 32 ohms
       
    ControlsUser ControlsSEEK, volume
    Set-up Controls (battery compartment)Alkaline/NiMH batteries, SQ enable/disable
    ProgrammingChannel lock
       
    IndicatorsLEDRed, illuminated when unit is on, flashes when batteries are low or to indicate charging, flashes when locked and SEEK is pushed
    LCD DisplayNone
       
    PowerBattery TypeTwo (2) AA batteries, alkaline or NiMH
    Battery 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)4.25 x 2.75 x 1.50 in. (10.8 x 7.0 x 3.8 cm)
    ColorDark Grey with white silk screening
    Unit Weight3.9 oz (111 g)
    Unit Weight with batteries5.8 oz (164 g)
    Shipping Weight6.1 oz (173 g)
    DoorManually lockable, SEEK behind door
       
    EnvironmentalTemperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
    Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
    Humidity0 to 95% relative humidity, non-condensing
       
    Specifications are subject to change without notification

    Requirements

    Used With

    • LT-800 Stationary FM Transmitter

      The LT-800 is connected to your main audio system, broadcasting a high quality audio signal to belt pack receivers, stationary receivers, or wireless speaker / receivers.

       
       

    Accessories

    Support Documents

    • FAQ

    What is the difference between the LR-300 and the LR-400?
    The LR-400 is more "user friendly" because it has the LCD Display, which will show the channel selection, battery life and signal strength. The LR-400 also has an adjustable squelch setting.
     
    Does this receiver sound as good as your other receivers, which are more expensive?
    Yes, all Listen receivers have the same superior audio quality.
     
    How many receivers can I have in a system?
    As many as you need, the number is endless.
     
    Can I use the LR-300 with the LT-700?
    We DO NOT recommend using the LR-300 with the LT-700 Portable FM Display Transmitter. The LR-300 was designed to be used with the LT-800 Stationary FM Transmitter only.
     
    What is the function of SQ?
    To reduce noise of our systems, Listen now 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.
     
    What is Squelching?
    The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch function is preset and cannot be changed on the LR-300.
     
    How do I SEEK for a new channel?
    If you hold down SEEK momentarily, the receiver will search for the nearest channel in use. 
     
    How do I lock the SEEK function?
    Holding SEEK for longer than 4 seconds will lock the receiver on the current channel. When SEEK has been locked, the SEEK function is no longer useable until the same process is achieved to unlock the unit. The LED on the top of the device will blink if the unit is locked and requested to SEEK another channel.
     
    What is the warranty of the LR-300?
    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

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