Portable Display FM Receiver (863 MHz)
LR-400-863

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.

Note: for use in Europe

Includes

 
LR-400 Portable Display FM Receiver
Quick reference card

Configurations

 LR-400-863 Portable Display FM Receiver (863 MHz)

Architectural Specs

The FM receiver shall be capable of receiving on 17 wide band channels with a SNR of 70 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 to 15 kHz (±3 dB). 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 receiver shall be able to function in both DX and Local mode. 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-400-863 is specified.

 

CAD Drawing

    • Specifications

     
     SpecificationsLR-400-863
    RFRF Frequency Range863.050 - 864.950 MHz
    Number of Channels17 Wideband
    Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
    Frequency Accuracy± .005% stability 32 to 122 ºF (0 to 50 ºC)
    AntennaIntegrated external antenna
    SquelchProgrammable in 20 steps, automatic on loss of RF signal
    ComplianceCE, ETSI, RoHS
       
    Audio** All system specifications are wireless end to end**
    System Frequency Response50 Hz - 15 kHz (±3 dB)
    System Signal to Noise Ratio70 dB (A-Weighted)
    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 battery switch
    Programming Channel lock, DX/Local, squelch 
       
    IndicatorsLEDRed, illuminated when unit is on, flashes when batteries are low or to indicate charging, flashes when locked and SEEK is pushed
    LCD DisplayChannel designation,battery level, battery charging, RF signal strength and channel lock 
       
    PowerBattery TypeTwo (2) AA batteries, alkaline or NiMH
    Battery Life (Listen Batteries)20 hours alkaline (LA-361), 10 hours NiMH rechargeable (LA-362)
    Battery Charging (NiMH only)Fully Automatic, 13 hours maximum
       
    PhysicalDimensions (H x W x D) 10.8 x 7.0 x 3.8 cm (4.25 x 2.75 x 1.50 in.)
    ColorDark Grey with white silk screening
    Unit Weight111 g (3.9 oz)
    Unit Weight with Batteries164 g (5.8 oz)
    Shipping Weight173 g (6.1 oz) 
    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

    None

    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.

    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 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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