LR-300 Specifications

Architectural Specifications

The FM receiver shall be capable of receiving on 17 wide band channels and have a SNR of 80dB or greater. The receiver shall be capable of seeking channels. The device shall have a squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz. The device shall incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to audio normally. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-300 is specified.

Specifications

 

Specification

 

LR-300-072

 

RF Frequency Range

 

72.025-75.950 MHz

 

Number of Channels

 

17 (wide band)

 

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

 

Automatic on loss of RF signal

 

Compliance

 

FCC Part 15, Industry Canada

 

 

 

 

 

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

 

System Frequency Response

 

63 Hz-15 kHz (± 3dB)

 

System Signal to Noise Ratio (A-weighted)

SQ™ enabled: 80dB; SQ™ disabled 60dB

Audio

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, SQ™ enable/disable

Controls

User Controls

Volume, SEEK (Channel SEEK is electronically lockable)

 

Programming

Channel selection can be locked by holding the SEEK button for 5 seconds

 

 

 

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 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. SEEK behind the 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-300

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

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.