Listen lt-800 Guide

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
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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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+1.801.233.8992
+1.800.330.0891 North America
+1.801.233.8995 Fax
[email protected]
www.listentech.com
Listen Technologies GmbH
Jasminstr. 16
905 22 Oberasbach, Germany
[phone] Tel
[phone] Fax
www.listentech.de
[email protected]
Thank you and enjoy your listening experience!
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Russell Gentner and the Listen Team
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were needed, 99% of all clients indicated that they were happy with repair
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less than 10 days!
Overall client satisfaction of working with Listen was rated 4.8 out of 5.
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Lifetime Warranty – the best in the business!
“Please continue with your excellent attitude toward customer satisfaction. You guys
are great!”
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“You stand behind your product wonderfully.”
The Word Around Listen

Design Guide LT-800 LR-400/500 Supplementary
Design Guide
FM Technology Overview 5
System Overview 6
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Notes 17
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Quick Reference 27
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Accessories 34
Notes 35
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Quick Reference 48
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Accessories 60
Notes 61
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Frequency Chart 70
Troubleshooting 71
Frequently Asked Questions 73
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Notes 76
Stationary FM Table of Contents

3
Design Guide
Stationary FM Design Guide Table of Contents
Table of Contents 3
Technology Overview 5
SystemOverview 6
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Notes 17

5
Design Guide
Frequency Modulation (FM) Technology Overview
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This same technology is used by local FM radio stations to broadcast music. FM signals can travel through
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frequency. Unlike infrared, FM transmission are not secure. This enables a receiver to travel further distances
from the source. This section of the manual will help you design a system that will get the best range and least
amount of interference.
Audio Source
FM Transmitter
FM Receiver
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• Multipath
Multipath interference is a form of RF interference that occurs when radio signals have more than one path
between the receiver and the transmitter causing the two RF signals to add out of phase. This could occur in areas with
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squelch when the receiver is moved. Portable applications are much more susceptible to multipath than those that are
stationary. Multipath distortion is often worse as the distance between transmitter and receiver increases
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• Antenna placement
The antenna should be placed as high as possible and in line of sight of the receivers. The antenna should not be
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the transmission range. Placing the antenna in areas where the RF cannot properly be transmitted will limit the range
of transmission.

6
Design Guide
System Overview
There are four main parts to a Stationary FM system – transmitter, antenna, receiver and input source, .
The input source can be audio from a sound board, microphone or a personal audio source like a CD player,
MP3 player, computer, DVD, etc. Audio will be Connected into the audio inputs of the stationary transmitter.
Input Source
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Portable Programmable
Display FM Receiver
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Portable Display FM
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Transmitter
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7
Design Guide
System Overview
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unit or remote mounted.
Antenna
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Receivers
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Portable Programmable
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Portable Display FM
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8
Design Guide
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Key Concepts in Designing a Stationary FM System
Input Selection
XLR Wiring
Input from
Balanced
Audio
Source
Unbalanced
Audio
Source
1/4”Phone Wiring
Balanced
Tip
Ring
Sleeve
Unbalanced
Top Ring Top Ring/Sleeve
Audio from
Balanced
Audio
Source
Unbalanced
Audio
Source
Sleeve
Input 1: Connect the audio source(s)
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Unbalanced right
and left phono
connectors

9
Design Guide
Key Concepts in Designing a Stationary FM System
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match the audio level coming from your equipment.
Input 2: Connect the audio source(s)
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When two inputs are present, both sets of input level lights will be activated.
Using Two inputs
Mix Level
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Mix level adjustment

10
Design Guide
Test Tone
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properly. All receivers should be able to hear this tone if tuned to the proper channel.
Selecting Transmitting Frequencies
Use this section of the guide to choose the channel settings for the transmitter and receivers.
Find transmission channel(s)
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Listen’s LT-800-863 oers 17 dierent channels to choose from
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these channels.
Testing System
Monitor Jack
The headphone jack is used to monitor the mix of input 1 & 2. You can adjust the monitor level with the volume
knob. The headphone jack is a standard 3.5 mm jack.
Key Concepts in Designing a Stationary FM System
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Headphone
monitoring jack

11
Design Guide
Key Concepts in Designing a Stationary FM System
Antenna placement (rear or remote)
Rear mounted antenna
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Remote antenna
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ATTENTION: Long cable runs can result in signal degradation due to the “loss” characteristics of
the cable. Minimize cable runs as much as possible or use “low loss” RG-8 cable.

12
Design Guide
Key Concepts in Designing a Stationary FM System
Front of the rack mounted antenna
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For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the
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Maximizing Transmission Range
Transmitting and receiving antennas
When designing and installing your system, keep in mind that the location of both the transmitting and
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Move transmitting and receiving antennas away from metal or conductive objects.
Antenna Placement
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CAUTION: When installing antennas, ensure the antenna is clear of power lines.

13
Design Guide
Key Concepts in Designing a Stationary FM System
Orientation
Orient both transmitting and receiving antennas vertically.
RF Power switch
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Cable Length
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RF Power Switch

14
Design Guide
Key Concepts in Designing a Stationary FM System
Mounting Transmitter
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can mount one or two transmitters to the standard 19” rack. The rack mounted unit will take 1 ru of space.
Rack Mount with dual units installed.
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the antenna in the front will give better reception range.
NOTE: The antenna may need to be remote mounted using the LA-130 Remote Antenna Kit if the
transmitter(s) is rack mounted. If a rack is metal, it is not recommended to have the antenna inside. Also,
the depth of the rack and equipment inside could prevent an antenna from being placed inside.
Rack Mount with single unit installed.