LR-400 Specifications

Architectural Specifications

The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater. The receiver shall be capable of seeking channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz, or of 63 Hz to 10 kHz, ± 3dB at 216 MHz. The device will incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to the 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 Listen LR-400 is specified.

Specifications

 

 

Specification

 

LR-400-072

LR-400-216

 

 

RF Frequency Range

 

72.025-75.950 MHz

216.025-216.975 MHz

 

 

Number of Channels

 

57 (17 wide, 40 narrow)

57 (19 wide, 38 narrow)

 

 

Sensitivity

 

.6uV typical, 1 uV maximum for 12dB SINAD

 

RF

Frequency Accuracy

 

± .005% stability 32 to 122º F (0 to 50º C)

 

Antenna

 

Uses earphone cable

 

 

 

 

 

 

 

Antenna Connector

 

3.5 mm connector

 

 

 

Squelch

 

Programmable in 20 steps

 

 

 

Compliance

 

FCC Part 15, Industry Canada

 

 

 

 

 

 

 

 

** All system specifications are wireless end-to-end

 

 

System Frequency Response

 

63 Hz-15 Hz (±3dB)

63 Hz-10 kHz (±3dB)

 

 

System Signal to Noise Ratio (A-weighted)

SQ™ enabled: 80dB;

SQ™ enabled: 80dB;

 

Audio

 

 

SQ™ disabled: 60dB

SQ™ disabled: 50dB

 

System Distortion

 

< 2% total harmonic distortion (THD) at 80% deviation

 

 

 

 

 

Output

 

3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,

 

 

 

impedance 32 Ohms

 

 

 

 

 

 

 

 

 

 

 

 

Set Up Controls

Alkaline/NiMH batteries and SQ™ enable/disable and programmable squelch setting

 

 

User Controls

Volume, channel UP/DOWN/SEEK (All controls except volume are electronically

 

Controls

lockable, and are behind the door)

 

 

 

 

 

 

Squelch can be adjusted for sensitivity and signal capture control. Channel selection

 

 

 

 

 

Programming

can be locked by holding the SEEK button for 5 seconds. Unit cannot be programmed

 

 

 

to seek only used channels, however, it is capable of entering squelch mode.

 

 

 

 

 

 

LCD Display

Indicates channel, RF signal strength, lock status, and squelch setting

 

Indicators

LED

Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg-

 

 

ing. Flashes when locked and user attempts to seek to another channel.

 

 

 

 

 

 

 

 

 

 

Battery Type

Two AA batteries, alkaline or NiMH

 

 

 

Battery Life (Listen batteries)

30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)

 

Power

Battery Charging (NiMH only)

Fully automatic, 14 hours

 

 

Power Supply Connector

2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA.

 

 

 

 

Drop in contact points for use with Listen charging/carrying cases

 

 

 

 

 

Compliance

UL Listed

 

 

 

 

 

 

 

 

Dimensions W x D x H

3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)

 

 

 

Unit Weight

3.9 oz. (111 g)

 

 

Physical

Unit Weight with batteries

5.8 oz. (164.4 g)

 

 

 

Shipping Weight

1.0 lbs. (453.6 kg)

 

 

 

Door

Manually lockable. UP, DOWN and SEEK protected by door

 

 

 

 

 

 

 

Temperature - Operation

14 to 104º F (10 to 40º C)

 

 

Environmental

Temperature - Storage

-4 to 122º F (-20 to 50º C)

 

 

 

Humidity

0 to 95% relative humidity, non-condensing

 

LR-400

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Listen Technologies LR-500, LR-300 manual LR-400 Specifications, Specification LR-400-072 LR-400-216

LR-500, LR-300, LR-400 specifications

Listen Technologies has established itself as a leader in providing innovative audio solutions that enhance communication in various environments. Among their standout products are the LR-400, LR-300, and LR-500, which are designed for assistive listening, language interpretation, and audio distribution. Each of these portable receivers offers unique features, ensuring that users have a seamless experience during presentations, events, and meetings.

The LR-400 is a versatile listening receiver that operates on a wide frequency range. It is specifically engineered for maximum clarity and disturbance-free reception. One of its primary features is the ability to connect directly to a variety of audio sources, making it compatible with numerous sound systems. This device boasts a prominent LCD display, which provides real-time information about channel selection and battery life, enhancing user accessibility. Additionally, the LR-400 supports both mono and stereo audio configurations, catering to different listening preferences and needs.

The LR-300, on the other hand, is specifically built for personal listening purposes, often utilized in classrooms, theaters, and guided tours. It is lightweight and compact, designed for ease of use and portability. One of the LR-300’s standout features is its long battery life, allowing for extended use without the need for frequent recharging. Users can easily adjust the volume for optimal sound levels, ensuring they can fully engage with the presented audio without compromising comfort. The LR-300 can also be equipped with various headphones and earphones, providing flexibility to suit individual preferences.

Finally, the LR-500 expands on the capabilities of its predecessors with advanced technology aimed at improving audiology experiences. It offers a digital communication protocol that significantly enhances audio quality while minimizing interference. The LR-500 is particularly suitable for professional settings, such as conferences and multinational events, where language interpretation is required. With multiple channel options, it allows participants to select their preferred language effortlessly. Its robust design ensures durability, making it suitable for frequent travel and usage in diverse environments.

In conclusion, the LR-400, LR-300, and LR-500 receivers from Listen Technologies exemplify the company's commitment to delivering high-quality audio solutions. Each device is equipped with advanced features and technologies that address specific user needs, whether for personal listening, language interpretation, or professional audio distribution. With their reliability and performance, these receivers enhance communication and accessibility in various settings, ensuring that every voice is heard loud and clear.