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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,
effi cient customer care. Because at Listen, it’s all about you! And should you
have any comments on how we might improve our products or our
service, we’re here to listen.
Here’s how to reach us:
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995
North America
fax
support@listentech.com
www.listentech.com
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!
• Overall client satisfaction of working with Listen was rated 4.8 out of 5.
• “ Please continue with your excellent attitude toward customer satisfaction. You guys are great!”
• “I’ve never had such good service from any company. Keep up the good work!”
• “You stand behind your product wonderfully.”
Assistive Listening • Language Interpretation • Soundfi eld • Tour Group • Conferencing
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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
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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
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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
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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
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Page 10
LT-800 Quick Reference
LT-800 Front Panel: Controls & Displays
Indicates audio input
Adjust audio input levels
of Input 1 and Input 2
here. See page 11 for
more information.
Power
ON / OFF
Test Tone: Activates
a tone to aid system
setup.
level of Input 1 and
Input 2.
Mix Level: Adjust so
the Mix Level meter
occasionally lights
the red LED.
Indicates
Process Mode
is active.
Shows
mixed audio
level.
Contour: Equalization
adjustment. Turn
counter-clockwise for
voice and clockwise for
music.
Indicates
Super Quiet
mode is active.
Channel Select Up:
Press for 3 seconds
to lock on current
channel.
Top mount antenna connection:
Remove rubber plug and screw
antenna in place.
LCD: Shows
which channel
is selected.
Monitor Port: Plug
in a headset and
adjust volume.
Channel Select Down:
Press for 8 seconds to
enter program mode.
See page 8 for more
information.
LT-800 Back Panel: Connections & Settings
Input 2: Set switch to
Remote Antenna Connection:
See page 19 or the Listen
website for details on antennas
that can be attached here.
Set RF Power level here
(¼, ½, and Full). See
page 8 for guidelines
on setting power levels.
Mix Output: These connectors
contain a mix of Input 1 and
Input 2. They are unbalanced
phono connectors; and the
output level is -10 dBu.
12 VDC 1.3 A
Input 2: Connect
The Listen LA-207
power supply
connects here.
unbalanced audio to these
phono connectors, input
level -10 dBu or +10 dBu.
match the level of your
Input 2 audio source,
not used to increase or
decrease level by +10 dBu.
Input 1: Used for balanced
connection of a microphone
or line level input. This
combination connector
accepts either XLR or ¼”
phono plugs.
Select Line, Mic or Mic+Phantom
Power. Line is balanced 0 dBu
input level, Mic is -55 dBu,
+12 VDC supplied in PH Power
position. If not using input 1, leave
in line position.
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LT-800 Setup Instructions
1
Unpack the Product
Remove outer packaging and plastic cover. Inspect for physical damage.
Mount in Rack (if necessary)
2
If rack mounting the unit, install the optional rack mount kit (part LA-326) according to the
instructions included with the kit, then install the LT-800 in the rack.
NOTE: If rack mounting, you will need to use a rear connection antenna.
Rack Mount with dual unit installed
3
Connect Antenna
Connect the antenna (not included) according to the installation
instructions. Only use an antenna supplied by Listen. If you are
connecting the antenna directly to the top of the LT-800, you will
need to remove the rubber plug on top of the unit. If you are using
a remote antenna connected to the rear of the unit, do not
connect an antenna to the top connector. See page 19 for
antenna options, or refer to the Listen website for remote antenna
options, www.listentech.com.
Coax antenna connection.
Rear of LT-800 shown.
LA-132 Remote Antenna
See RF Reception Maximization
Strategies and Coaxial Cable on
page 13.
Rack Mount with single unit installed
Shown with LT-800
rubber plug
LT-800 shown with top mount
antenna connected through top of
unit (part number LA-134)
4
Connect Power
Plug the power supply into the power connector on the
back panel, then plug the power supply into an outlet. Only
use a Listen approved power supply (The LA-207, an in-line
switching power supply, is the approved power supply for this
unit).
12 VDC 1.3 A
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LT-800 Setup Instructions (cont.)
5
Set SQ™ (Super Quiet) and Process Features
Your transmitter is shipped to you with SQ (super quiet) enabled and Process disabled. For
a detailed description of these features and when to use them, please refer to page 12.
To Disable or Enable SQ and Process Features:
With the unit on press and hold the channel select “Down” button for 8 seconds. The
program (PGM) icon will appear on the LCD.
Once in the program mode,
Program
icon
the SQ and Process features can be turned on and off by pressing the channel select
buttons. Press the channel select “Up” button to toggle between Process On and Off.
Press the channel select “Down” button to toggle between SQ On and Off.
LED lit when
Process is enabled
If the green LED is illuminated on the front panel,
that feature is enabled. Once you have enabled or
disabled the features as desired, let the transmitter
exit the program mode by waiting 5 seconds.
LED lit when
SQ is enabled
6
Set RF Power
Set the RF POWER switch on the back of the unit
to 1/4, 1/2, Full (Level is indicated on the LCD
display). The amount of transmitted RF power that
you will need depends on your application. If you
are operating multiple transmitters in the same
environment, it is best to set the transmitters
output power to its lowest level to reduce the
possibility of interference.
Back of LT-800 unit
12 VDC 1.3 A
Full
power
1/2
power
1/4
power
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LT-800 Setup Instructions (cont.)
7
Connect Audio Inputs
The LT-800 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using
either an XLR or 1/4” phono connector. Input 2 has two unbalanced mixing phono connectors.
Use Input 1 if you are using a microphone or if you have a balanced connection such as from a
professional audio mixer (you can also use Input 1 for unbalanced connections). Use Input 2 to
connect to an unbalanced audio source.
Input 1
Input 1 offers a choice of balanced XLR
or 1/4” phono connector.
Plug your microphone into Input 1 and move
the input select switch to Mic (for dynamic
microphones) or Mic + PH Power (for condenser
microphones).
Plug your balanced or unbalanced audio source
into Input 1. Use the following diagram.
Line
Mic
Mic with
Phantom
Power
Back of LT-800 with XLR connected to Input 1
12 VDC 1.3 A
XLR Wiring
- +
1/4” Phone Wiring
Input 2
Plug your unbalanced audio source into Input 2 and select the audio
level switch for -10 dBu or +10 dBu, to match the audio level coming
from your equipment.
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LT-800 Operating Instructions
Power Unit On
1
Turn power on by pressing the power button.
2
Select a Channel
Select the transmit channel by pressing the channel select UP and DOWN buttons. See
Channel Selection on page 14 for more information.
Channel Select UP and DOWN buttons
3
Lock on Channel
Once you determine your transmit channel, you can lock the transmitter on that channel.
To lock on a channel hold the Channel Select “Up” button for 3 seconds until the padlock
icon appears on the display. To unlock, repeat this process and the padlock icon will
disappear.
Lock icon
4
Test Tone (if necessary)
To broadcast a test tone, press the test tone button. This helps to test receivers when no
audio source is available.
Press Test Tone
button here
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LT-800 Audio Control
Adjust Audio Input Level
1
Adjust the input knob counterclockwise to add gain to Input 1. This will decrease gain
to Input 2. Adjust input knob clockwise to add gain to Input 2. This will decrease gain
to Input 1. If you have two audio sources connected to both Input 1 and 2, adjust the
level of one input using the VU meter, then adjust the output level of the other audio
source. Adjust the input level until the left VU meter(s) occasionally illuminate the red
LEDs. Illumination of the red LEDs indicates the unit is in limiting. Limiting is required so
that the unit does not over-modulate the transmitter. If you don’t want any audio
limiting to occur, make sure the red LEDs never illuminate. If you want a highly limited
signal, turn the audio gain up so the red LEDs illuminate often.
Adjust Mix Level
2
Adjust the mix level until the right VU meter occasionally illuminates the red LED. This is the
level adjustment for the combined output from Input 1 and Input 2.
Adjust Contour
3
Adjust the Contour knob counterclockwise if your audio source is mostly voice. Adjust
the knob clockwise if your audio source is mostly music. The Contour knob adjusts the
relative equalization of the unit. This equalization boosts or cuts frequencies above 5 kHz.
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Listen SQ™ (Super Quiet) - Improving Your Listening Experience
People are accustomed to listening to low noise, high fidelity audio
(delivered via CD, DVD, etc.). FM radio systems, such as those made
by Listen, have more inherent noise compared to most sound systems.
To minimize noise, Listen uses a noise reduction technology called
ListenSQ™. Both the transmitter and receiver must have the SQ
feature enabled to achieve the desired results. SQ is available on
new Listen systems, including the system you received in this shipment.
If you are planning to use this product with older Listen systems that
do not have Listen SQ, or equipment not manufactured by Listen, you
must disable Listen SQ.
Your Listen LT-800 has been shipped to you with the SQ feature
enabled. You may need to disable the SQ function for one or more of
the following reasons:
1
You are using your new Listen LT-800 with older version Listen
receivers that do not have the SQ function.
2
You are using your new Listen LT-800 with equipment supplied
by other manufacturers (Listen is the only manufacturer using SQ
Technology).
3
You expect that end users will bring and use their own receivers
that don’t have the SQ function.
NOTE: See page 8 to enable or disable SQ (Super Quiet).
SQ Summary
• SQ is NOT squelch
• SQ improves noise performance
by at least 20 dB
• SQ is NOT compatible with
older version Listen products
• SQ is NOT compatible with
other manufacturers’ products
• To work properly, SQ must be
enabled for both the transmitter
and receivers
• SQ can be disabled to permit
operation with older Listen
products or other
manufacturers’ products
Process Mode
Process mode is used for Audio Gain Control (AGC). With the process
mode enabled, the LT-800 will automatically adjust for inconsistent
signal input levels by raising or lowering the signal level accordingly to
provide a consistent sound output level. This feature should be used in
applications where a consistent sound level is important and the input
levels vary substantially. Typically you would not want to engage the
Process Mode when a speaker’s emphasis is critical to the message
they are conveying.
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RF Reception Maximization Strategies
For proper and dependable operation, Listen receivers need to receive a strong and consistent
signal from the originating transmitter. Note that on portable receivers the headset wire is the
receiving antenna. The following strategies should be used maximize to this signal:
1
When designing and installing your system, keep in mind that the location of both the
transmitting and receiving antennas is critical to maximize broadcast range.
2
Eliminate or minimize obstructions between the transmitting and receiving antenna.
3
Minimize the distance between the transmitting and receiving antennas.
4
Move transmitting and receiving antennas away from metal or conductive objects.
5
Place the transmitting antenna as high as possible.
6
Orient both transmitting and receiving antennas vertically.
7
Position the RF Power switch on the back of the LT-800 to full RF Power, unless lower power is
acceptable (see page 8).
8
Keep coaxial cable from transmitter to antenna as short as possible.
CAUTION: When installing antennas, ensure the antenna is clear of power lines.
Coaxial cable, connectors, and optional antenna mounting kits are available from Listen. See
page 19-20, visit www.listentech.com or ask your dealer for details.
Coaxial Cable
The antenna for the LT-800 can be mounted directly on the unit if desired. However, you may
find that the unit will provide better performance when the antenna is located elsewhere. If you
plan to mount the antenna in a different location other than the top of the unit, you must use
cable and connectors rated at 50 ohms. Although cable used for cable TV installations looks
similar to this cable, it will not work with your Listen system.
If you need to run cable over a length greater than 75 feet for 150 MHz applications or to maximize broadcast range, Listen recommends that you use RG-8 cable rather than RG-58. RG-8 is a
lower loss cable, meaning that more of your signal will reach the antenna.
Long cable runs can result in signal degradation due to the “loss” characteristics of the cable.
When using RG-58 with a 150 MHz transmitter, there is an average* loss of 6 dB per 100 feet of
cable (A 3 dB loss means half of your power has been lost.) However, it is better to suffer coaxial
power loss than to try to shoot your signal through obstacles! Obstacles, especially metal, can
create drop-outs or reflections of your signal that will result in poor listening conditions.
*NOTE: There are many varieties of 50 ohm, RG-58 and RG-8 cables. You may purchase a
cable that is better or worse than this value. Please check with the cable vendor or
manufacturer for exact specifications.
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Channel Selection
It is important to choose channels that are free from interference to
achieve proper operation of your Listen equipment. This process is trial
and error. Before turning on the transmitter, listen to the wide band
channels on the receivers (channels 1-6). Listen to the audio through
the headphone or via the speaker and choose a channel with the
least amount of interference. Unless you are interfacing with an
existing narrowband transmission system, always use a wide band
channel.
If you are using multiple channels follow this process:
1. Same Space: If you are using multiple transmitters in the same space,
the most number of channels that will work simultaneously is six at
150 MHz. With all of the transmitters off, listen for interference on
all the wide band channels via the headphone jack on a Listen
receiver. Using the frequency chart on page 15, eliminate any
channels that have noticeable interference. Now choose the
channels with the widest channel spacing. It is
recommended that adjacent channels be spaced at least 300kHz.
Wide Band Recommendation
Listen recommends that you always
use a wide band channel unless you
need to be compatible with existing
narrow band receivers from other
manufacturers. Wide band channels
have lower noise than their narrow
band counterparts.
150 MHz
The LT-800-150 MHz operates on 6
wide band channels and 26 narrow
band channels.
• 1 - 6 = Wide Band Channels
• 7 - 32 = Narrow Band Channels
2. Distributed Spacing: If you are using transmitters that are spread out
over space, you can achieve more simultaneous broadcast
channels. However, it is critical that your receiver(s) be located as
close to its transmitter as possible. You can use adjacent
channels (see frequency chart on page 15) in this case as long as
the adjacent channel transmitter is at least 50% further away from
the receiver as its transmitter.
It is highly recommended that after channel selection has been
achieved, you lock the channel so that it cannot be changed by the
user. To accomplish LOCK on the LT-800, press the “UP” button for 3
seconds. Repeat the process to unlock.
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Page 19
150 MHz Frequency Chart
Channel Frequency
01 150.900
02 152.400
03 151.500
04 152.100
05 151.200
06 151.800
07 150.850
08 150.950
09 151.000
10 151.050
11 151.100
12 151.150
13 151.250
14 151.300
15 151.350
16 151.400
17 151.450
18 151.550
19 151.600
20 151.650
21 151.700
22 151.750
23 151.850
24 151.900
25 151.950
26 152.000
27 152.050
28 152.150
29 152.200
30 152.250
31 152.300
32 152.350
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Page 20
LT-800 Troubleshooting
Troubleshooting
The LT-800 has no power
Make sure the LA-207 power supply is connected to a power source and is connected to the
jack marked “Power Input”. Make sure the POWER button is pressed in.
There is no audio or the audio level is too low
Make sure that your audio source is properly connected to Input 1 and/or Input 2. The Input 1
or Input 2 switches must be in the correct position for the appropriate input level. For example:
if you are using the output of a mixer on Input 2, the switch should be in the -10 dBu position.
If it were to be in the +10 dBu position, the level would be too low. Also, check the Input knob
to ensure it is properly adjusted. You should be able to see the VU meter deflect on Input 1
or Input 2 corresponding with the input level of the audio source. You can listen to the audio
source by connecting a headset to the front panel jack and adjusting the Monitor
volume control.
If the level of audio into the transmitter is low and can’t be corrected using the level input
switches, the audio processor can be turned on to boost the signal (see page 8 to set, page 12
for description of Process Mode).
The audio is distorted
Check to make sure you have the input level select switches in the proper position. You may
be providing too much audio level for the input stage to handle. Make sure the SQ mode is set
correctly on both the LT-800 and the receivers you are using. If your receivers do not have SQ,
make sure the SQ mode is turned off (see page 8).
There is hum in the audio
Make sure you have properly grounded the audio source to the LT-800. Check the connections
from the audio source to the LT-800. If you can, try to use a balanced audio source - this will
reduce the chance of creating hum. Connect a ground wire from the LT-800 to ground and/or
to the ground of the source audio.
There is a tone
The Test Tone button has been pressed (its LED light is on). Push the Test Tone button to turn off
the tone.
The Audio Input 1 sounds “tinny”
If you are using an unbalanced audio source, make sure Pin 3 on the XLR or the ring on the
¼” plug is grounded (see page 9).
I cannot pick up the signal on the receiver
Check to make sure that they are on the same channel. Make sure the LT-800 has
an antenna connected. Ensure that the receiver has an antenna (for portable products the
headset is the receiving antenna).
I can pick up the signal on the receiver, but it sounds like it’s not tuned in
Check to make sure the transmitter and receiver are on exactly the same channel. It’s a good
idea to lock the channels once they have been set. To lock the LT-800, press the UP button for
3 seconds (see page 10).
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Page 21
LT-800 Troubleshooting (cont.)
Troubleshooting
There is not sufficient range
First make sure that the receivers you are using are operating properly, then make sure that
you have an antenna connected either to the top of the LT-800 transmitter or connected to
the back of the unit (but not both!). The antenna should be as high as possible and free of
obstacles. In addition make sure you are using the correct antenna type for your unit. You
might want to use a remote antenna (provided by Listen) that can be mounted on a mast
or wall. Try using different frequencies to find one with less interference.
There is interference in my transmission
Ensure that the transmitter and receivers are on the same channel. Verify that there are no
other transmitters on the same channel or a close channel to the one exhibiting interference.
Try different channels until you find a clear channel.
End users are adjusting the unit
First, lock the channel by pressing and holding the channel select UP button for 3 seconds.
Consider removing the Input, Mix Level and Contour knobs. You can order a rack mount kit
from Listen which offers a security cover that will limit access to the unit.
Several transmitters are operating in the same environment
For this, you’ll need to choose your transmitting frequencies carefully. See page 13-15 for
more details.
Can I have two antennas connected to my transmitter
No. The LT-800 transmitter can use only one antenna connection at a time. You may connect
either a top mount antenna through the top antenna port, or a remote antenna connected to
the BNC connection on the rear of the unit. If multiple antennae are simultaneously connected
to both ports the transmitter will have extremely poor broadcast performance and range.
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Page 22
Warranty & Contacting Listen
Warranty
Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-82, LT-700, LT-800, LR-42,
LR-44, LR-400, LR-500) to be free from defects in workmanship and material under normal use and conditions for the
useful lifetime of the product from date of purchase.
Listen warrants its Stationary IR Radiators (LA-140) to be free from defects in workmanship and material under normal
use and conditions for three years from the date of purchase.
Listen warrants its Noise Canceling Microphone (LA-270) to be free from defects in workmanship and material under
normal use and conditions for one year from date of purchase.
Listen warrants its Charging/Carrying Cases (LA-306, LA-311, LA-313, LA-317, LA-318, LA-319, LA-320, LA-321, LA-322,
LA-323, LA-324, LA-325) to be free from defects in workmanship and material under normal use and conditions for
one year from date of purchase.
All other products and accessories are warranted for 90 days from date of purchase.
This warranty is only available to the original end purchaser of the product and cannot be transferred. Warranty is
only valid if warranty card has been returned within 90 days of purchase. This warranty is void if damage occurred
because of misuse or if the product has been repaired or modifi ed by anyone other than a factory authorized
service technician. Warranty does not cover normal wear and tear on the product or any other physical damage
unless the damage was the result of a manufacturing defect. Listen is not liable for consequential damages due to
any failure of equipment to perform as intended. Listen shall bear no responsibility or obligation with respect to the
manner of use of any equipment sold by it. Listen specifi cally disclaims and negates any warranty of merchantability
or fi tness of use of such equipment including, without limitation, any warranty that the use of such equipment for any
purpose will comply with applicable laws and regulations. The terms of the warranty are governed by the laws of the
state of Utah.
In the fi rst ninety days after purchase, any defective product will be replaced with a new unit. After 90 days, Listen
will, at its own discretion either repair or replace transmitters and receivers with a new unit or a unit of similar type
and condition. Product that is not covered under warranty shall be repaired or replaced with a unit of similar type
and condition based on a fl at fee. Contact Listen for details.
This limited warranty, prices and the specifi cations of products are subject to change without notice.
Contacting Listen
If technical service is needed, please contact Listen. Pre-authorization is required before returning Listen products.
If products were damaged in shipment, please contact the carrier, then contact Listen for replacement or repair
requirements payable by the carrier.
Listen’s corporate headquarters are located in Bluffdale, Utah U.S.A. and are open Monday through Friday, 8am to
5pm Mountain Time.
14912 Heritagecrest Way
Bluffdale, Utah 84065-4818
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995
support@listentech.com
www.listentech.com
North America
fax
18
Page 23
Optional Accessories
Antenna Accessories
LA-132
Universal Antenna Kit
LA-135
Antenna Kit for Rack Mount
LA-133
90˚ Helical Antenna
(150 MHz)
LT-800 Rack Mount Accessories
Universal Rack Mounting Kit
Includes components for single and dual rack
configuration and a security cover
NOTE: Rack mounted units cannot use the
LA-134 top mounted antenna.
LA-134
Telescoping Top Mounted
Antenna (150 MHz)
LA-326
19
Page 24
Optional Accessories (cont.)
-2
61
278
Cable & Connectors Accessories
LA-112
RG-58 50 Ohm
Coaxial Cable (per ft.)
LA-128
RG-8 BNC Connector
LA-113
RG-8 50 Ohm Low-Loss
Coaxial Cable (per ft.)
Microphone Accessories
LA-127
RG-58 BNC Connector
20
LA-261
Lavalier Microphone
LA-276
Collar
Microphone
NOTE: To use Listen microphones you must use a converter (LA-280) to adapt the 3.5 mm connection to a 1/4” phono connection.
LA-277
Conferencing
Microphone
LA-262
Over-the-Head
Microphone
LA-
LA-278
Behind-the-Head
Microphone
LA-270
Noise Canceling
Microphone
LA-279
Over-the-Ear Microphone
Presentation Style
LA-274
Hand-Held
Microphone
LA-280
¼ in. to 3.5 mm
Microphone
Adapter for
LT-800/LT-82
Page 25
Notes
21
Page 26
Notes
22
Page 27
Notes
23
Page 28
Listen Technologies Corporation
14912 Heritagecrest Way
Bluffdale, Utah 84065-4818, U.S.A.
+1.801.233.8992
1.800.330.0891
+1.801.233.8995
North America
fax
www.listentech.com
Printed in China
© 2009 Listen Technologies Corporation
®
All Rights Reserved 09162009
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