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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
satisfied. 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,
efficient 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
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 • Soundfield • Tour Group • Conferencing
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LT-800 Table of Contents
Package Contents
Specifications
Architectural Specifications
Specifications
3
4
4
4
5
Block Diagram
Quick Reference
6
Setup Instructions
7
Operating Instructions
Audio Control
Listen SQ™ (Super Quiet)
RF Reception Maximization Strategies
Coaxial Cable
10
11
12
13
13
Channel Selection
Compatibility Charts
72 MHz Frequency Compatibility Chart
216 MHz Frequency Compatibility Chart
Phonak Frequency Compatibility Chart
14
15
15
16
17
Supplementary Information
Troubleshooting
Compliance Notice
FCC Statement
Warranty
Contacting Listen
Optional Accessories
18
18
20
20
21
21
22
1
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LT-800 Package Contents
LT-800 Contents
Listen Part Number
• LT-800-072 (72 MHz) or
• LT-800-216 (216 MHz) or
• 12 VDC Power Supply
• User Manual
LT-800-072 (72 MHz)
LT-800-216 (216 MHz)
Optional Accessories
See page 22
3
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LT-800 Specifications
Architectural Specifications
The stationary FM transmitter shall be capable of broadcasting on 57 channels. The transmitter
shall have a SNR of 80dB or greater. The output power shall be adjustable to quarter, half or
full. Channel tuning shall be capable of being locked. The device shall broadcast on both wide
and narrow band channels. The device shall have an audio frequency response of 63 Hz to
15k Hz, ± 3dB at 72 MHz, or of 63 Hz to 10k Hz, ± 3dB at 216 MHz. It shall have two mixing audio
inputs. The device shall have the following audio controls: input level, mix level and an
adjustable low pass filter. The device shall have an audio processor that is capable of
automatic gain control and limiting. The Listen LT-800 is specified.
Specification
Specifications
RF Frequency Range
Number of Channels
Frequency Accuracy
Transmitter Stability
Output Power
LT-800-072
LT-800-216
72.025 - 75.950 MHz
216.025 - 216.9875 MHz
19 wide band, 38 narrow band
17 wide band, 40 narrow band
+/-.005% stability 32˚ to 122˚F (0˚- 50˚C)
50 PPM
RF
80,000uV at 3 m
100mW (max allowed by FCC)
Antenna
Various Antennas available
BNC
Antenna Connector
Compliance
FCC Part 15, Industry Canada
FCC Part 90, Industry Canada
** All system specifications are wireless end-to-end
50 Hz - 15 kHz (±3 dB)
System Frequency Response
50 Hz - 10 kHz (±3 dB)
System Signal to Noise Ratio
(A-Weighted)
80 dB SQ enabled; 60 dB SQ disabled
80 dB SQ enabled; 50 dB SQ disabled
System Distortion
<2% total harmonic distortion (THD) at 80% deviation
Rear panel. (1) Female-XLR and ¼ 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 1
Audio
Rear panel. Two (2) Phono connectors, unbalanced, -10/+10 dBu nominal input level
adjustable, +30 dBu maximum, impedance 100k Ohms.
Audio Input 2
Audio Processing (Process)
Contour
Compression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1
Cuts and boosts frequencies above 5 kHz
Input 1 and Input 2 Mixed Output (Rear Panel). Two (2) phono connectors, unbalanced, -10 dBu nominal output level,
+19 dBu maximum, impedance 10 ohm.
Combined Audio Output (Mix)
Headphone Output (Monitor)
Front panel. One (1) 3.5 mm stereo connector, unbalanced, adjustable output level, +7 maximum, impedance 10 Ohm.
Front Panel
Power, Test Tone on/off, Channel UP/DOWN, Input levels, Mix level, Contour, Monitor volume control.
Input 1 Level (line, mic, mic-phantom power), Input 2 Level (-10/+10 dBu), RF Power (low, mid, high)
Compression ratio for audio processor
Rear Panel
Controls
Internal Adjustments
Programming
SQ on/off, Processing on/off. Channel lock
Input 1 and Input 2, Mix VU
SQ and Processing
RF Power
Indicates Input 1, Input 2 and Mix audio levels. 10 segment LED’s (8 green, 2 red)
Indicated by a green LED when on (front panel)
Indicators
Indicated on the LCD (low, mid, high)
LCD Display
Channel designation, lock status, RF Power Level, programming (front panel)
Red LED illuminates when test tone enabled
Test Tone
Power Supply Type
In-line power supply. Listen part number LA-207 (Line cord is determined by each country’s AC power standards).
Input: 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Input
Power
Power Supply Output
Power Supply Connector
Power Supply Compliance
Output: 12 VDC, 1.3 A, 15.6 W
Output Connector: .02 in. (5.0 mm) OD, .01 in. (2.5 mm) ID, barrel type
UL, CE, GS, TUV
Dimensions (H x W x D)
Color
1.75 x 8.50 x 9.13 in. (4.5 x 21.5 x 23 cm)
Dark Grey with white silk screening
2.6 lbs. (5.7 kg)
Unit Weight
Unit Weight with LA-201
Power Supply
4.4 lbs. (2.0 kg)
Physical
Shipping Weight
5.0 lbs. (2.26 kg)
One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space.
Optional rack mount (LA-326)
Rack Mounting
Temperature - Operation
-10˚C (14˚F) to +40˚C (104˚F)
-20˚C (-4˚F) to +50˚C (122˚F)
Environmental Temperature - Storage
Humidity
0 to 95% Relative Humidity, non condensing
Specifications are subject to change without notification
4
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LT-800 Block Diagram
POWER
On
Oꢀ
Red
LED
3.5MM
Stereo
CHANNEL SELECT
In-Line
Power Supply
LA-201
115VAC6
0 Hz
Up
HEADPHONE
(provided)
15VAC, 1A
Power Supply
CPU Module
Down
Volume
Listen LCD Display
Backlighted
MIX Level
VU Meter
Top Mounted
Antenna Stud
Compression Ratio
(internal adjustment)
Remote
Antenna
Connection
Transmitter RF Board
Pre-emphasis
Processing
SQ
Companding
BNC
ANTENNA
Green
LED
Green
LED
MIX LEVEL
Oꢀ
On
On
Low
Oꢀ
High
Functions controlled by the CP
Module
Mid
PROCESS
RF POWER
SQ
CONTOUR
Input 1 VU
Meter
Input 2 VU
Meter
Input Level
Front Panel
12VDC
Input 1 Level Select
Mic-Phantom Pwr, Mic, Line
Line
Mic
Mic
Phantom Pwr
Input 2 Level Select
+10dBu/-10dBu
Test Tone Button
Front Panel
+10dBu
-10dBu
ON
OFF
Red
LED
Female XLR-1/4"
Combo Connecto
Phono
Phono
400Hz
2/Tip 3/Ring
1/Sleeve
INPUT 2
MIX OUTPUT
TEST TONE
INPUT 1
5
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LT-800 Quick Reference
LT-800 Front Panel: Controls & Displays
Top mount antenna connection:
Remove rubber plug and screw
antenna in place.
Indicates
Process Mode
is active.
Indicates audio input
level of Input 1 and
Input 2.
Indicates
Super Quiet
mode is active.
LCD: Shows
Monitor Port: Plug
which channel
is selected.
Shows
mixed audio
level.
in a headset and
adjust volume.
Adjust audio input levels
of Input 1 and Input 2
here. See page 11 for
more information.
Power
ON / OFF
Mix Level: Adjust so
the Mix Level meter
occasionally lights
the red LED.
Channel Select Down:
Press for 8 seconds to
enter program mode.
See page 8 for more
information.
Test Tone: Activates
a tone to aid system
setup.
Channel Select Up:
Press for 3 seconds
to lock on current
channel.
Contour: Equalization
adjustment. Turn
counter-clockwise for
voice and clockwise for
music.
LT-800 Back Panel: Connections & Settings
Input 1: Used for balanced
connection of a microphone
or line level input. This
combination connector
accepts either XLR or ¼”
phono plugs.
Input 2: Set switch to
Remote Antenna Connection:
match the level of your
Input 2 audio source,
Mix Output: These connectors
contain a mix of Input 1 and
Input 2. They are unbalanced
phono connectors; and the
output level is -10dBu.
See page 22 or the Listen
website for details on antennas
that can be attached here.
not used to increase or
decrease level by +10dBu.
Select Line, Mic or Mic+Phantom
Power. Line is balanced 0 dBu
input level, Mic is -55dBu, +12VDC
supplied in PH Power position.
If not using input 1, leave in line
position.
Set RF Power level here
(¼, ½, and Full). See
page 9 for guidelines
on setting power levels.
Input 2: Connect
The Listen LA-201
power supply
connects here.
unbalanced audio to these
phono connectors, input
level -10dBu or +10dBu.
6
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LT-800 Setup Instructions
1
2
Unpack the Product
Remove outer packaging and plastic cover. Inspect for physical damage.
Mount in Rack (if necessary)
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 single unit installed
Rack Mount with dual unit installed
Shown with LT-800
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 22 for
antenna options, or refer to the Listen website for remote antenna
Coax antenna connection.
Rear of LT-800 shown.
LA-122 Remote Antenna
See RF Reception Maximization
Strategies and Coaxial Cable on
page 13.
rubber plug
LT-800 shown with top mount
antenna connected through top of
unit (part numbers LA-101, LA-106 (72
MHz) or LA-102 (216 MHz)
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
5
Select Phonak Compatibility (if necessary)
If you will be using Phonak receivers with your LT-800 (216 MHz only), the transmitter can become
completely compatible through software control. When switched to this mode, the LT-800 transmitter
will display the Phonak channels. By integrating Phonak channels and compatibility into the
LT-800-216, it is more convenient to use Phonak receivers with Listen transmitters. (www.phonak.com)
7
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LT-800 Setup Instructions (cont.)
To Select Phonak Mode:
Press and hold down the channel select “up” button while
powering on the unit. The LCD will display a “P” momentarily
upon power up indicating that the transmitter is in the Phonak
Channel Mode. The channels displayed will now match
Phonak channels. To return to the Listen channel designations,
repeat this process. The LCD will display an “L” momentarily
upon power up indicating that you are in the Listen
Channel Mode.
6
Select Channel Mode (if necessary)
Your transmitter has been shipped to you with only a limited number of channels available (Basic
Mode). If all channels (Expanded Mode) are required, use the following procedure.
To Select Expanded Mode:
To enable or disable the Expanded Mode, press and hold the
channel select “down” button while powering on the unit. When
the Basic Mode is enabled, “L/O” (lockout) will be displayed on the
LCD display as shown below. This indicator is extinguished when in
the Expanded Mode.
7
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 featurs 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,
LED lit when
SQ is enabled
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.
8
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LT-800 Setup Instructions (cont.)
8
Set RF Power
Full
Set the RF POWER switch on the back of the unit
to Full, 1/2 or 1/4 (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.
power
1/2
power
Back of LT-800 unit
1/4
power
9
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
Connect the audio source(s) to one or both audio
input connections. Input 1 offers a choice of
Line
Back of LT-800 with XLR connected to Input 1
balanced XLR or 1/4” phono connector.
Mic
Plug your microphone into Input 1 and move
the input select switch to Mic (for dynamic
microphones) or Mic + PH Power (for condenser
microphones).
Mic with
Phantom
Power
Plug your balanced or unbalanced audio source
into Input 1. Use the following diagram.
XLR Wiring
1/4” Phone Wiring
-
+
7
Input 2
Plug your unbalanced audio source into Input 2 and select the audio
level switch for -10dBu or +10dBu, to match the audio level coming
from your equipment.
9
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LT-800 Operating Instructions
Power Unit On
1
2
Turn power on by pressing the power button.
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
NOTE: The LT-800 is shipped with only limited channels (Basic Mode). To select
from all channels (Expanded Mode) refer to page 12. (for a more detailed
description of Basic and Expanded Mode refer to page 12)
3
Lock on Channel
Once you determine your transmit channel, you can lock the transmitter on that channel.
To lock 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
10
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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.
2
Adjust Contour
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.
3
Adjust Mix Level
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.
If you are using another manufacturers’ receivers with the LT-800, determine the frequency
of their receivers then refer to Listen’s Frequency Compatibility Tables (pages 15-16) to find
the LT-800 channel that corresponds with the receiver’s frequency. We recommend
verifying corresponding channel designations on these tables to ensure compatibility
and provide the best possible reception.
The LT-800 is Phonak compatible and can be set to display Phonak specific channels. See
page 8 to set Channel Mode and page 14 for specific channel designations.
11
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Listen SQ™ (Super Quiet) - Improving Your Listening Experience
People are accustomed to listening to low noise, high fidelity audio
SQ Summary
(delivered via CD, DVD, etc.). FM radio systems, such as those made
• SQ is NOT squelch
by Listen, have more inherent noise compared to most sound systems.
• SQ improves noise performance
by at least 20dB
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.
• 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
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:
• SQ can be disabled to permit
operation with older Listen
products or other
1
2
You are using your new Listen LT-800 with older version Listen
receivers that do not have the SQ function.
manufacturers’ products
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).
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.
Basic and Expanded Mode
In the default Listen channel mode, only the most commonly used
channels are available. This is called “Basic Mode”. When the LT-800
is in Basic Mode, “L/O” (lock-out) will be displayed on the LCD,
meaning some transmission channels are unavailable. If the
channel needed is not available in Basic Mode, access to all
transmission channels is achieved in “Expanded Mode”. To access
Expanded Mode press and hold the channel select “down” button
while powering on the unit. To return to Basic Mode, repeat the same
process of powering on the unit while holding the “down” button.
12
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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 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
necessary (see page 9).
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
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 50 feet for 216 MHz applications or greater
than 100 feet for 72 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 72 MHz transmitter, there is an average* loss of 4 dB per 100 feet of
cable and at 216 MHz using RG-58 an average* loss of 8 dB per 100 feet of cable. (A 3dB 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.
13
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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 (lettered channels at 72 MHz and channels
that start with a “2” for 216 MHz when using a Listen receiver). 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.
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.
At 72MHz
If you are using multiple channels follow this process:
1. Same Space If you are using multiple transmitters in the same space,
the highest number of channels that will work simultaneously is six at
72 MHz and three at 216 MHz. With all of the transmitters
The LT-800 at 72 MHz operates on 17
wide band channels and 40 narrow
band channels.
•
Letters= Wide Band Channels
(Example: E)
off, listen for interference on all the wide band channels with a
Listen receiver. Using the frequency compatibility tables on pages
15-17, 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 300k Hz
apart. If there is no interference the following channels are
recommended. For a 72 MHz system, use channels A, C, E, I, J
and H. For a 216 MHz system, use channels 2A, 2K and 2V.
•
Numbers= Narrow Band Channels
(Example: 32)
At 216MHz
The LT-800 at 216 MHz operates on
19 wide band channels and 38 nar-
row band channels.
•
“2” as left digit= Wide Band
Channel
(Example: 2C)
“1” and “3” as left digits= Narrow
Band Channels (Examples: 1A; 3R)
2. Distributed Spacing If you are using transmitters that are distributed
over a large area, 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 compatibility tables (on pages 15-17) in this case
as long as the adjacent channel transmitter is at least 50% further
away from the receiver than the original transmitter. Example: The
transmitter for the receiver on channel E is 100 feet from the
receiver. The adjacent channel transmitter on channel D should
be at least 150 feet away.
•
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.
Notes in regard to using 72 MHz and 216 MHz systems:
1. 72 MHz is a secondary frequency band. This means that other
transmitters are licensed to use these frequencies. Thus, you may
experience interference from paging transmitters and other types
of transmissions. You will need to find a clear channel by listening
to all the wide band channels.
2. 216 MHz is a primary frequency band and no other types of
transmissions are authorized to use it. Thus, you will find the
highest probability of clear channels in this band. However, you
may experience intermodulation of the TV Channel 13 aural carrier
if there is a channel 13 transmitter in your area and you are close
to the transmitter. If you cannot find a clear channel in 216 MHz
band due to channel 13, it is recommended that you switch to
a 72 MHz system.
14
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72 MHz Compatibility Chart
Wideband frequencies are indicated in highlighted rows.
The highlighted channels also indicated those channels
available in the “basic” mode (default). All channels can
be accessed when in the “expanded” channel mode (see
page 8 for more information).
*Parenthesis indicate T35 and T20 narrowband.
15
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216 MHz Compatibility Chart
Frequency
MHz
Phonic
Ear
Light
Speed
N01
Listen
1A
2A
3A
1B
2B
3B
1C
2C
3C
1D
2D
3D
1E
Comtek
1
Phonak Williams Gentner
1
CSI
1
AVR
C01
216.0125
216.0250
216.0375
216.0625
216.0750
216.0875
216.1125
216.1250
216.1375
216.1625
216.1750
216.1875
216.2125
216.2250
216.2375
216.2625
216.2750
216.2875
216.3125
216.3250
216.3375
216.3625
216.3750
216.3875
216.4125
216.4250
216.4375
216.5125
216.5250
216.5375
216.5625
216.5750
216.5875
216.6125
216.6250
216.6375
216.6625
216.6750
216.6875
216.7125
216.7250
216.7375
216.7625
216.7750
216.7875
216.8125
216.8250
216.8375
216.8625
216.8750
216.8875
216.9125
216.9250
216.9375
216.9625
216.9750
216.9875
41
42
43
44
45
46
47
48
49
51
52
53
54
55
56
57
58
59
60
41
2
3
42
4
5
43
6
7
44
8
9
41
2
1
21
42
4
2
10
6
5
C05
43
22
23
44
8
A
B
C
D
E
3
4
14
2
9
C09
C12
N09
N12
2E
3E
1F
2F
45
10
11
46
12
13
47
14
15
48
16
17
49
18
21
51
22
23
52
24
25
53
26
27
54
28
29
55
30
31
56
32
33
57
34
35
58
36
37
59
38
39
60
40
45
24
25
46
12
13
47
26
27
48
16
17
49
18
61
29
62
28
52
64
65
53
81
82
54
68
69
55
83
84
56
72
73
57
76
85
58
86
77
59
88
79
60
80
5
6
11
7
3F
1G
2G
3G
1H
2H
3H
1J
2J
3J
1K
2K
3K
1L
7
F
8
15
18
3
C18
C21
N18
G
H
I
9
10
11
12
13
14
15
2L
3L
12
8
C24
C25
N64
1M
2M
3M
1N
2N
3N
1P
2P
3P
1R
2R
3R
1S
J
K
L
16
19
4
C29
C32
C33
N72
2S
3S
1T
2T
13
9
Wideband frequencies are indicated
in highlighted rows. The highlighted
channels also indicated those channels
available in the “basic” mode (default).
All channels can be accessed when in
the “expanded” channel mode (see page
8 for more information).
3T
1U
2U
3U
1V
2V
3V
C37
N77
N80
17
5
C39
C40
Wideband frequencies in highlighted rows.
16
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Phonak Frequency Chart
Frequency (MHz)
Listen
Phonak
216.012
216.025
216.037
216.062
216.075
216.088
216.113
216.125
216.137
216.162
216.175
216.188
216.213
216.225
216.238
216.262
216.275
216.287
216.312
216.325
216.338
216.363
216.375
216.387
216.412
216.425
216.438
216.512
216.525
216.537
216.562
216.575
216.588
216.613
216.625
216.637
216.662
216.675
216.688
216.713
216.725
216.738
216.762
216.775
216.787
216.812
216.825
216.838
216.863
216.875
216.887
216.912
216.925
216.938
216.963
1A
2A
3A
1B
2B
3B
1C
2C
3C
1D
2D
3D
1E
2E
3E
1F
1
41
2
21
42
4
5
43
22
23
44
8
9
45
24
25
46
12
13
47
26
27
48
16
17
49
18
61
29
62
28
52
64
65
53
81
82
54
68
69
55
83
84
56
72
73
57
76
85
58
86
77
59
88
79
2F
3F
1G
2G
3G
1H
2H
3H
1J
2J
3J
1K
2K
3K
1L
2L
3L
1M
2M
3M
1N
2N
3N
1P
2P
3P
1R
2R
3R
1S
2S
3S
1T
2T
3T
1U
2U
3U
1V
Wideband frequencies are indicated in highlighted
rows. The highlighted channels also indicated those
channels available in the “basic” mode (default). All
channels can be accessed when in the “expanded”
channel mode (see page 8 for more information).
216.975
2V
3V
60
80
216.988
17
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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 -10dBu position.
If it were to be in the +10dBu 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 the receiver and the transmitter are using the same frequency band
(i.e. 72 MHz or 216 MHz) and 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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LT-800 Troubleshooting (cont.)
Troubleshooting
I’m using another brand of receiver - how do I tell which channel to use
Refer to Listen’s Frequency Compatibility Tables (pages 15-17). Adjust Listen’s transmitter to the
same frequency as the other major brand. Since Listen products can access 57 channels, they
will most likely receive on the same fixed channel or channels of other major brands. If you are
using another brand of receiver, make sure you have turned off the SQ feature on the Listen
product(s).
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. If this does not work, try a different
frequency band (i.e. if you are using 72 MHz, try 216 MHz or vice versa). Please contact Listen
support for assistance and a return authorization (RMA) number to exchange product for
alternate frequency equipment.
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.
I am using other manufacturers’ receivers and the sound is distorted
The receiver is probably not designed to handle the +25 kHz deviation of the Listen transmitter.
This can be corrected by turning the Mix Level knob down. Another possibility is that you have
enabled the SQ function of the LT-800, and this feature is not available in other companies’
products. You will need to disable SQ in this event (see page 8).
If you are using Phonak receivers, the transmitter is capable of operating in the Phonak mode
(please refer to page 8).
Several transmitters are operating in the same environment
For this, you’ll need to choose your transmitting frequencies carefully. See page 15-17 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.
19
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Compliance Notice & FCC Statement
Compliance Notice
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) These devices may not cause harmful interference, and (2) these devices must accept any
interference received, including interference that may cause undesirable operation.
Listen’s LT-800 Transmitter (216 MHz only)
Listen’s LT-800 transmitter is authorized by rule under the Low Power Radio Service (47 C.F.R. Part 95) and
must not cause harmful interference to TV reception or United States Navy SPASUR installations. You do
not need an FCC license to operate these transmitters. These transmitters may only be used to provide:
auditory assistance to persons with disabilities, persons who require language translation, or persons in
educational settings; health care services to the ill; law enforcement tracking services under agreement
with a law enforcement agency; or automated maritime telecommunications system (AMTS) network
control communications. Two-way voice communications and all other types of uses not mentioned
above are expressly prohibited.
This device must be installed by a trained audio professional or certified dealer of Listen. The user
can’t make any modifications to the unit without expressed written consent of Listen Technologies
Corporation. Any modifications made will void the FCC compliance, Listen warranty and the users
authority to operate Listen’s equipment.
FCC Statement
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
This equipment has been certified to comply with the limits for a class B computing device, pursuant to
FCC and IC Rules. In order to maintain compliance with FCC and IC regulations, shielded cables must
be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to
result in interference to radio and TV reception. The user is cautioned that changes and modifications
made to the equipment without the approval of manufacturer could void the user’s authority to operate
this equipment.
20
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Warranty & Contacting Listen
Warranty
Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-82, LT-700, LT-800, LR-100, LR-42,
LR-44, LR-300, LR-400, LR-500, LR-600) 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 modified 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 specifically disclaims and negates any warranty of merchantability
or fitness 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 first 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 flat fee. Contact Listen for details.
This limited warranty, prices and the specifications 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.
Listen Technologies GmbH
Jasminstr.16, 90522 Oberasbach, Germany
14912 Heritagecrest Way
Bluffdale, Utah 84065-4818
+1.801.233.8992
Europe
+49 911 955 159 0
Fax
+49 911 955 159 40
North America
+1.800.330.0891
+1.801.233.8995
fax
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Optional Accessories
Antenna Accessories
LA-101
Helical Top Mounted Antenna
(72 MHz)
LA-102
Telescoping Top Mounted
Antenna (216 MHz)
LA-106
Telescoping Top Mounted
Antenna (72 MHz)
LA-123
90˚ Helical Antenna
(72 MHz)
LA-107
Ground Plane Remote Antenna
(216 MHz)
LA-122
Universal Antenna Kit
The single solution for all of
your indoor remote antenna
needs. Includes: 72 and 216 MHz
components; flexible and rigid
dipoles and monopole radials;
hardware for multiple mount-
ing configurations; and 25 feet
(7.6m) of RG-58 coax cable.
LA-124
90˚ Helical Antenna
(216 MHz)
LT-800 Rack Mount Accessories
LA-125 (72 MHz) and LA-126 (216 MHz)
Antenna Kit for Rack Mount
LA-326
Universal Rack Mounting Kit
Includes components for single and dual rack
configuration and a security cover
NOTE: Rack mounted units cannot use the LA-106,
LA-102 or LA-101 top mounted antenna.
22
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Optional Accessories (cont.)
Cable & Connectors Accessories
LA-112
LA-113
LA-127
RG-58 50 Ohm
Coaxial Cable (per ft.)
RG-8 50 Ohm Low-Loss
Coaxial Cable (per ft.)
RG-58 BNC Connector
LA-390
LA-128
LA-391
RG-8 50 Ohm Preassembled
Coaxial Cable (per ft.)
RG-8 BNC Connector
RG-58 50 Ohm Preassembled
Coaxial Cable (per ft.)
Microphone Accessories
LA-270
LA-274
LA-262
Noise Canceling
Microphone
Hand-Held
Microphone
Lavalier Microphone
Over-the-Head
Microphone
LA-276
Collar
Microphone
LA-277
Conferencing
Microphone
LA-280
Behind-the-Head
Microphone
A-279
Over-the-Ear Microphone
Presentation Style
¼ in. to 3.5 mm
Microphone
Adapter for
LT-800/LT-82
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.
23
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Notes
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Notes
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Notes
26
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Notes
27
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Listen Technologies Corporation
14912 Heritagecrest Way
Bluffdale, Utah 84065-4818, U.S.A.
+1.801.233.8992
North America
+1.800.330.0891
+1.801.233.8995
fax
© 2008 Listen Technologies Corporation® All Rights Reserved 081308
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