Listen Technologies LT-800-150 User Manual

Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to providing

you with the highest quality products available. We take great pride in their
outstanding performance because we care that you are completely
satisfi ed. That’s why we independently certify them to the highest quality
standards and back them with a limited lifetime guarantee. We stand ready
to answer any questions you might have during installation or in the operation
of our products. Should you experience any problems whatsoever with your
Listen products, we are ready to help you in any way we can with prompt,
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have any comments on how we might improve our products or our
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+1.800.330.0891
+1.801.233.8995

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fax

[e-mail]
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Thank you and enjoy your listening experience!
Best regards,

Russell Gentner and the Listen Team

• In the few instances where repairs were needed, 99% of all clients indicated that they were happy with
repair turn-around-times and 85% of the time, clients were without their product for less than 10 days!

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Assistive Listening • Language Interpretation • Soundfi eld • Tour Group • Conferencing

LT-800 Table of Contents

Package Contents 3
150 MHz Specifi cations 4
Block Diagram 5
Quick Reference 6
Setup Instructions 7
Operating Instructions 10

Audio Control 11
Listen SQ™ (Super Quiet) 12
RF Reception Maximization Strategies 13
Coaxial Cable 13
Channel Selection 14
150 MHz Frequency Chart 15

Troubleshooting 16
Warranty 18
Contacting Listen 18
Optional Accessories 19

1

LT-800 Package Contents

LT-800 Contents

• LT-800-150 (150 MHz)

• 12 VDC Power Supply

• User Manual

• Quick Reference Card

Listen Part Number

LT-800-150 (150 MHz)

Optional Accessories

See pages 19-20

3

LT-800 Specifi cations

Architectural Specifi cations

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.

Specifi cations*

RF Frequency Range 150.8000 MHz - 152.3500 MHz
Number of Channels 6 wideband, 26 narrowband

Audio

Number of Simultaneous
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 /

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

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

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

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

+30 dBu maximum, impedance 100k ohms

maximum, impedance 10 ohms

6

ohms

Controls &

Indicators

Power

Physical

Environmental

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 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

Dimensions (H x W x D) 1.75 x 8.50 x 9.13 in (4.5 x 21.5 x 23 cm)
Color Dark Grey with white silk screening
Unit Weight 2.6 lbs. (1.2 kg)
Shipping Weight 6 lbs. (2.7 kg)

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

*Speci cations are subject to change without noti cation

4

In-Line

Power Supply

LA-201

(provided)

Top Mounted

Antenna Stud

BNC

Listen LCD Display

Backlighted

HEADPHONE

3.5MM
Stereo

15VAC, 1A

Transmitter RF Board

Power Supply

CPU Module

SQ

Companding

Processing

Pre-emphasis

POWER

On

O

PROCESS

SQ

ANTENNA

Functions controlled by the CP

Module

Volume

Up

Down

Remote

Antenna

Connection

On

O

Compression Ratio

(internal adjustment)

Red
LED

Green

LED

Green

LED

CONTOUR

MIX LEVEL

CHANNEL SELECT

On

O

Low

High

Mid

Female XLR-1/4

Combo Connect

2/Tip

3/Ring

Line

1/Sleeve

Mic

12VDC

Mic
Phantom Pwr

Input 1 Level Select

Mic-Phantom Pwr, Mic, Line

+10dBu

Input 2 Level Select

+10dBu/-10dBu

Phono

Phono

Input Level

Front Panel

TEST TONE

OFF

ON

Red
LED

Test Tone Button
Front Panel

MIX OUTPUT

Input 1 VU

Meter

Input 2 VU

Meter

INPUT 2

INPUT 1

RF POWER

MIX Level

VU Meter

LT-800 Block Diagram

115VAC6

0 Hz

-10dBu

400Hz

5