Portable Display FM Receiver
LR-400

Highlights

  • Superior audio quality – 80 dB (70 dB with 863 MHz) signal-to-noise ratio (SNR), setting the industry’s sound quality standard.
  • 57 channels (33 channels with 150 MHz and 17 channels with 863 MHz).
  • 100 % Digital – Listen receivers are digitally-tuned so the transmission won’t drift.
  • Limited Lifetime Warranty with hassle-free support.
  • Look & Listen™ LCD shows channel, battery status, and signal strength.
  • 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-400 Portable Display FM Receiver is a lower cost digital display receiver. It has the same exceptional audio quality and convenient recharging options as Listen's other full-featured receivers. The LR-400 can receive up to 17 wide band channels with 40 narrow band (72 MHz), 6 wide band with 27 narrow band (150 MHz), 19 wide band with 38 narrow band (216 MHz) and 17 wide band (863 MHz) channels. The LR-400 has a digital display (LCD) to monitor channel selection, battery level, and signal strength. An LED on top of the receiver indicates if the unit is on, when batteries are low or if the unit is locked on a channel. It has channel SEEK capability and is compatible with mono or stereo earphones. It has channel SEEK capability and is compatible with mono or stereo earphones.

Includes

LR-400 Portable Display FM Receiver
Quick reference card

Configurations

 
LR-400-072 Portable Display FM Receiver (72 MHz)
LR-400-216 Portable 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 device shall be able to be locked on a single channel. The receiver shall be capable of seeking channels. The unit shall incorporate a multi-functional LED that indicates power, channel lock, low battery, and battery charging. The device shall have a programmable squelch. The device shall have an audio frequency response of 50 Hz - 15 kHz (±3 dB) at 72 MHz and 50 Hz - 10 kHz (±3 dB) at 216 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 incorporate an LCD display that indicates channel, battery level, low battery, battery charging, RF signal strength and channel lock status. 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-400-072 or LR-400-216 is specified.

CAD Drawing

    • Specifications

     
     SpecificationsLR-400-072LR-400-216
    RFRF Frequency Range72.025 - 75.950 MHz                                                                                   216.0125 - 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 122 ºF (0 to 50 ºC)
    AntennaUses earphone cable
    SquelchProgrammable in 20 steps, automatic on loss of RF signal
    ComplianceFCC Part 15, Part 90, Industry Canada, RoHS
        
    Audio** All system specifications are wireless end to end**
    System Frequency Response50 Hz - 15 kHz (±3 dB)50 - 10 kHz (±3 dB)
    System Signal to Noise RatioSQ enabled 80 dB, SQ disabled 60 dBSQ enabled 80 dB, SQ disabled 50 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 ohm
      
    ControlsUser ControlsChannel up/down, SEEK, volume
    Set-up Controls (Battery Compartment)Alkaline/NiMH batteries, SQ enable/disable
    ProgrammingChannel lock, squelch
        
    IndicatorsLEDRed, illuminated when unit is on, flashes when batteries are low or to indicate charging, flashes when locked and SEEK is pushed
    DisplayChannel designation,battery level, battery charging, RF signal strength and channel lock 
        
     Battery TypeTwo (2) 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 120 VAC; O/P 7.5 VDC 250 mA, drop in contact points for use with charging cases, power supply not included (LA-202)
    Power Supply Connector0.09 in. (2.3 mm) OD by 0.7 mm ID, barrel type connector 7.5 VDC, center positive <250 mA, drop in contact points for use with Listen charging cases
    Power Supply ComplianceRoHS, WEEE, UL, PSE, CE, CUL, TUV, CB
       
    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/channel select behind the door
        
    EnvironmentalTemperature - Operation14 to 104 ºF (-10 to 40 ºC) 
    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

    • FAQ

     
    What is the difference between the LR-400 and the LR-500?
    The LR-500 gives the user an opportunity to lockout unused channels and has the controls on the outside of the front door.
    Can the LR-400 be used with multiple transmitters?
    Yes. The LR-400 can be used with multiple transmitters, but unlike the LR-500, it cannot be programmed to lock out channels.
    How many receivers can I have in a system?
    As many as you need, the number is endless.
     
     
    What is the function of SQ?
    To reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™ (on 72 MHz and 216 MHZ only). 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 can be programmed to the desired setting with the LR-400.
     
    What is the warranty of Listen receivers?
    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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