Listen Technologies LR-400, LR-500, LR-300 user manual RF Reception Maximization Strategies

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RF Reception Maximization Strategies

For proper and dependable operation, Listen receivers should receive a strong and consistent signal from the originating transmitter. The following strategies should be used maximize this signal:

a.When designing and installing your system, keep in mind that the location of both the transmitter and receivers is critical to maximizing signal strength.

b.Eliminate or minimize obstructions between the transmitter and receivers.

c.Minimize the distance between the transmitter and receivers.

d.Move transmitter and receivers away from metal objects.

e.Place the transmitting antenna as high as possible (on stationary transmitters).

f.Orient both transmitting and receiving antennas vertically.

g.For 216MHz stationary LT-800 transmitter only, consider using a gain antenna such as a Yagi type antenna or the LA-107 ground plane antenna.

h.On portable transmitters and receievers, the cable from the microphone or headset is the anten- na; ensure that the cable is not coiled or laying horizontal.

CAUTION: When installing remote antennas, ensure the antenna is clear of power lines.

NOTE: If the RF signal to the 216MHz models is too high, the audio will be distorted. This may happen if you are within 40 feet (12m) of the LT-800-216 transmitter or within 5 feet (1.5m) of the LT-700-216 transmitter.

Coaxial cable, connectors, and optional antenna mounting kits are available from Listen. Visit www.ListenTech.com or ask your dealer for details.

RF Reception Strategies

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Contents User’s Manual Welcome to Listen Receivers Table of Contents This page intentionally left blank LR-500 Programmable Display Receiver Optional Accessories LR-500 Package Contents Listen Part NumberLR-500 Table of Contents Architectural Specifications LR-500 SpecificationsLR-500 Specifications 5mm Input Jack Listen earpiece or headset connects here Quick Reference LR-500 FrontLR-500 Top of Unit Quick Reference LR-500 Inside Access DoorQuick Reference LR-500 Look & Listen Display LR-500 Battery IndicatorOpen the front access door LR-500 Setup InstructionsSelect Battery Type Remove the productPlace Batteries in Unit Set SQ switchTurn the Unit On Connect an Earphone or HeadsetSelect ChannelsLCD display will Set SquelchLR-500 Operation Instructions Adjust the volume control Find an audio transmission using SeekTo Lock into Only One Channel Is the Channel Locked on My Receiver?LR-500Programming Instructions Enter the Program modeLocking Out Unwanted Channels Use the UP and Down keys to select channelsSquelch LR-500 SquelchSquelch Programming Squelch Programming InstructionsLR-500 Charging LR-500 Charging BatteriesLR-500 Charging Batteries LR-500 Wall Transformer Operation This page intentionally left blank User’s Manual LR-400 Package Contents Listen Part Number LR-400 Table of Contents Specification LR-400-072 LR-400-216 LR-400 SpecificationsLR-400 Specifications LR-400 Top of Unit Quick Reference LR-400 FrontBattery Select Switch Quick Reference LR-400 Inside Access DoorQuick Reference LR-400 Look & Listen Display LR-400 Battery IndicatorLR-400 Setup Instructions Set SQ switch See pages 36 and 37 for squelch and programming information Select ChannelsLR-400 Operation Instructions Find an audio transmission using Seek LR-400 Squelch Squelch Programming Instructions LR-400 LR-400 Charging BatteriesLR-400 Charging Batteries LR-400 Wall Transformer Operation User’s Manual LR-300 Package Contents Listen Part Number LR-300 Table of Contents Specifications LR-300 SpecificationsLR-300 Specifications Quick Reference LR-300 Front Quick Reference LR-300 Inside Access Door LR-300 Top of Unit LR-300 Setup Instructions Place Batteries in Unit LR-300 Operation Instructions LR-300 Operation & Squelch LR-300 LR-300 Charging BatteriesLR-300 Charging Batteries LR-300 Wall Transformer Operation Supplementary Information Channel Selection Channel Selection SQ Summary Listen SQRF Reception Maximization Strategies 72MHz Compatibility Chart Narrowband 216MHz Compatibility Chart Compatibility Chart Receiver has no power Receiver Troubleshooting LR-300, LR-400, LR-500There is no audio Audio is distortedCannot pick up the signal on the receiver Receiver TroubleshootingThere is not sufficient range Users keep changing channelsWant to run the unit from a wall transformer My batteries are not chargingCompliance Notice FCC Statement Warranty Optional Accessories Earphone Options Professional Camcorder Cable Optional Accessories Connector OptionsPage
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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.
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