Listen Technologies LT-800-150 manual LT-800 Specifications, Architectural Specifications

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LT-800 Specifications

Architectural Specifications

The stationary FM transmitter shall be capable of broadcasting on 32 channels. The transmitter shall have an SNR of 80 dB or greater. The output power shall be adjustable to quarter, half or full. Channel tuning shall be capable of being locked. The device shall have an audio frequency response of 50 Hz to 15 kHz (±3 dB). It shall have two (2) mixing audio inputs and a mixed signal output. The device shall have the following audio controls: input level, mix level and an adjustable low pass filter (contour). The device shall have an audio processor that is capable of automatic gain control and limiting. The Listen LT-800-150 is specified.

Specifications*

Audio

RF Frequency Range

150.8000 MHz - 152.3500 MHz

 

 

Number of Channels

6 wideband, 26 narrowband

 

 

Number of Simultaneous

6

Transmitters

 

 

 

Frequency Accuracy

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

 

 

Transmitter Stability

50 PPM

 

 

Transmission Range

Up to 762 m (2500 ft.)

 

 

Output Power

100 mW

 

 

System Frequency Response

50 Hz - 15 kHz (±3 dB)

 

 

System Signal to Noise Ratio

SQ enabled 80 dB, SQ disabled 60 dB

 

 

System Distortion

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

 

 

Audio Input 1

Rear panel, one (1) Female XLR and 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 /

 

+21 dBu (line/mic) maximum input level, impedance 20k / 1k ohms (line/mic), phantom power +12 VDC

Audio Input 2

Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable,

 

+30 dBu maximum, impedance 100k ohms

 

 

Audio Processing (Process)

Compression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1

 

 

Contour

Cuts and boosts frequencies above 5 kHz

 

 

Combined Audio Output (Mix)

Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu

 

maximum, impedance 10 ohms

Headphone Output (Monitor)

Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10

 

ohms

 

 

Controls & Indicators

Front Panel

Power, Test Tone on/off, Channel up/down, Input Levels, Mix Level, Contour, Monitor volume control

 

 

Rear Panel

"Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)"

 

 

Programming

Process on/off, SQ on/off, channel lock

 

 

Input1, Input 2, Mix Level VU

Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)

 

 

Processing

Indicated by a green LED when on (front panel)

 

 

RF Power

Indicated on the LCD (low, mid, high)

 

 

LCD Display

Channel Designation, lock status, RF power level, programming (front panel)

 

 

Test Tone

Red LED illuminates when test tone is enabled.

 

 

Power

Power Supply

In line power supply (Listen part number LA-207)

 

 

Power Supply Input

Input: 100-240 VAC, 50-60 Hz, 0.4 A

 

 

Power Supply Output

Output: 12 VDC, 1.3 A, 15.6 W

 

 

Power Supply Connector

Output Connector: 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type

 

 

Power Supply Compliance

UL, CE, GS, TÜV, RoHS

 

 

Physical

Dimensions (H x W x D)

Color

Unit Weight

Shipping Weight

1.75x 8.50 x 9.13 in (4.5 x 21.5 x 23 cm) Dark Grey with white silk screening

2.6lbs. (1.2 kg)

6 lbs. (2.7 kg)

Environmental

Temperature - Operation

-10 ºC (14 ºF) to +40 ºC (104 ºF)

 

 

Temperature - Storage

-20 ºC (-4 ºF) to +50 ºC (122 ºF)

 

 

Humidity

0 to 95% relative humidity, non condensing

 

 

*Specifications are subject to change without notification

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Contents Page Page Page Page LT-800 Table of Contents Page LT-800 Package Contents LT-800 Specifications Architectural SpecificationsLT-800 Block Diagram HeadphoneLT-800 Quick Reference LT-800 Front Panel Controls & DisplaysLT-800 Setup Instructions Connect PowerUnpack the Product Mount in Rack if necessarySet RF Power Set SQ Super Quiet and Process FeaturesTo Disable or Enable SQ and Process Features Connect Audio Inputs InputPower Unit On LT-800 Operating InstructionsSelect a Channel Lock on ChannelAdjust Audio Input Level Adjust Mix LevelAdjust Contour LT-800 Audio ControlListen SQ Super Quiet Improving Your Listening Experience RF Reception Maximization Strategies Coaxial CableIf you are using multiple channels follow this process Channel SelectionMHz Frequency Chart LT-800 Troubleshooting TroubleshootingThere is not sufficient range Contacting Listen Warranty & Contacting ListenWarranty LT-800 Rack Mount Accessories Optional AccessoriesAntenna Accessories Cable & Connectors Accessories Microphone AccessoriesPage Page

LT-800-150 specifications

Listen Technologies LT-800-150 is a robust and versatile transmitter designed primarily for assistive listening applications. It is a pivotal component of the Listen Technologies assistive listening systems, allowing users to experience clear audio in various environments, such as theaters, churches, conference rooms, and other public venues.

The LT-800-150 operates in the 72-76 MHz frequency range, which is specifically allocated for assistive listening devices, providing reliable audio transmission without interference. This wide frequency range ensures compatibility with a myriad of receivers, enabling a seamless experience for users with hearing impairments. The device offers a power output of 150 mW, ensuring a strong and clear signal that can cover a large area, making it ideal for spacious venues.

One of the standout features of the LT-800-150 is its exceptional audio quality. The transmitter is equipped with a balanced XLR microphone input, allowing users to connect a variety of audio sources, such as microphones or sound systems. This flexibility ensures that whether it's a live performance or a pre-recorded presentation, the audio remains crystal clear for the audience.

The LT-800-150 also supports multiple channels, allowing several transmitters to operate simultaneously without cross-interference. This characteristic is particularly valuable in environments where multiple events or services occur concurrently, enabling each to cater to the specific audio needs of their attendees.

User-friendly design is another hallmark of the LT-800-150. The device features a simple interface with LED indicators that provide users with real-time feedback on power, audio activity, and other essential functions. Additionally, it comes with a built-in audio compression feature, which helps to optimize sound quality and maintain consistent audio levels.

Built for durability, the LT-800-150 is constructed with high-quality materials, making it suitable for frequent use in various settings. Its compact design means it can be easily integrated into existing audio setups without taking up significant space.

In summary, the Listen Technologies LT-800-150 is a reliable and effective solution for assistive listening. With its powerful output, excellent sound quality, and user-friendly features, it stands out as an essential tool for ensuring accessible audio experiences for all individuals, particularly those with hearing challenges. Whether in a public space or at a private event, the LT-800-150 delivers superior performance that enhances communication and inclusivity.