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Overview
Offering the same high-performance audio and convenient recharging features as our other receivers, the LR-400-072 Portable Display RF Receiver is an affordable option for establishing or expanding your assistive listening system. Capable of receiving up to 17 wide-band or 40 narrow-band channels, the LR-400-072 features a digital LCD display, channel seeking capabilities, and compatibility with mono or stereo headphones. The LCD display provides each user with channel selection, battery level, and signal strength information, and an LED on the top of each receiver indicates power status and low battery conditions.
Approved for assistive listening use in the U.S. by the FCC, the LR-400-072 Portable Display RF Receiver is a cost-effective way to provide assistive listening to your customers, clients, or patrons.

Includes

One (1) LR-400 Portable Display RF Receiver
One (1) Quick reference card

Highlights

  • Cost-effective solution to beginning or expanding your RF assistive listening system
  • Can receive up to 17 wide-band or 40 narrow-band channels
  • Easy-to-read LCD display with battery status, channel information, and signal strength readings
  • Channel seek capabilities
  • 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
Configurations & Architectural Specs

Configurations

LR-400-072 Portable Display RF Receiver (72 MHz)

LR-400-216 Portable 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 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.
Product Specifications
SpecificationLR-400-072

Audio

Frequency Response50 Hz - 15 kHz (±3 dB)
Signal-to-Noise RatioSQ enabled 80 dB, SQ disabled 60 dB
Audio Output Jacks3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm
Distortion< 2% total harmonic distortion (THD) at 80% deviation

Controls

User ControlsChannel up/down, SEEK, volume, Alkaline/NiMH batteries, SQ enable/disable
ProgrammingChannel lock, squelch

Indicators

LCDChannel designation, battery level, battery charging, RF signal strength and channel lock
LEDsRed, illuminated when unit is on, flashes when batteries are low or to indicate charging, flashes when locked and SEEK is pushed

RF

Frequency Range72.025 - 75.950 MHz
Number of Channels17 wide band, 40 narrow band
Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy± .005% stability 32 to 122 ºF (0 to 50 ºC)
SquelchProgrammable in 20 steps, automatic on loss of RF signal
Antenna TypeUses earphone cable

Power

Power SupplyI/P 120 VAC; O/P 7.5 VDC 250 mA, drop in contact points for use with charging cases, power supply not included (LA-208)
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
Battery TypeTwo (2) AA batteries, alkaline or NiMH
Battery Life30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging TimeFully automatic, 13 hours
ComplianceRoHS, WEEE, UL, PSE, CE, CUL, TUV, CB

Physical

Width2.75 in. (7.0 cm)
Height4.25 in. (10.8 cm)
Length1.50 in. (3.8 cm)
Unit Weight with Batteries5.8 oz (164 g)
Shipping Weight1.0 lbs. (0.5 kg)
Weight3.9 oz (111 g)
DoorManually lockable, SEEK/channel select behind the door

Environmental

Temperature - Operation14 to 104 ºF (-10 to 40 ºC)
Temperature - Storage-4 to 122 °F (-20 to 50 °C)
Relative Humidity0 to 95% relative humidity, non-condensing

Compliance

SafetyRoHS
RFFCC Part 15, Part 90, Industry Canada
Requirements
Used With
Accessories
FAQ
QWhat is the function of SQ?
ATo 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.
QWhat is the difference between the LR-400 and the LR-500?
AThe LR-500 gives the user an opportunity to lockout unused channels and has the controls on the outside of the front door.
QCan the LR-400 be used with multiple transmitters?
AYes. The LR-400 can be used with multiple transmitters, but unlike the LR-500, it cannot be programmed to lock out channels.
QWhat is squelching?
AThe 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.
QHow many receivers can I have in a system?
AAs many as you need, the number is endless.
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