Listen Technologies 800-002 LPRS Model LT-800B-072 User Manual lt 800b manual 2005 05 17 qxp

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User’s Manual
LT-800 Stationary Transmitter
Don’t miss a single sound. Listen.
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 U.S.A.
Telephone: 1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: 1.801.233.8995
E-mail: info@ListenTech.com
Welcome to Listen!
Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to providing you
the highest quality products and prompt, efficient customer care. Our products are
manufactured in an ISO-9000 factory that has been independently certified to the
highest quality standards. We stand ready to answer any questions you might have
during installation or in the operation of our products. Should there be any
problems with your Listen products, we are ready to help you in any way we can.
We appreciate any comments you may have on how we might improve our products
or our service. Here’s how to reach us:
Telephone: 1.801.233.8992
Fax: 1.801.233.8995
Toll Free (North America): 1.800.330.0891
E-Mail: support@ListenTech.com
Web: www.ListenTech.com
Thank you... and enjoy your listening experience!
Russell Gentner, President
Best regards,
The Listen Team
LT-800 Package Contents
Listen Part Number
·
·
·
·
·
72 MHz: LT-800-072
216 MHz: LT-800-216
LT-800 Stationary Transmitter (72 MHz or 216 MHz)
LA-201 120 VAC Power Supply
LA-121 BNC Adapter (72 MHz model only)
User Manual
Quick Reference Sticker
Optional Accessories
See pages 19-20
Listen™ and the Listen Logo are registered trademarks of Listen Technologies Corporation.
LT-800_2005_05_17 © 2004 Listen Technologies Corporation. All Rights Reserved.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Phonak Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Audio Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Compatibility with other Manufacturers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Listen SQ™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Process Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Basic and Expanded Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
RF Reception Maximization Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Coaxial Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
72 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
216 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Phonak Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Compliance Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Table of Contents
Table of Contents
Specifications
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.
Specifications
RF
Specification
RF Frequency Range
Number of Channels
Frequency Accuracy
Transmitter Stability
Output Power
Antenna
Antenna Connector
Compliance
System Frequency Response
System Signal to Noise Ratio (Aweighted)
System Distortion
Audio
Audio Input 1
Audio Input 2
LT-800-072
LT-800-216
72.025 - 75.975 MHz
216.025 - 216.975 MHz
57 (17 wide, 40 narrow)
57 (19 wide, 38 narrow)
+/- .005% stability 0 to 50C
50 PPM
8,000uV at 3m
100mW (Max allowed by FCC)
Several available. See www.ListenTech.com for details
BNC
BNC
FCC Part 15, Industry Canada
** All system specifications are wireless end-to-end
63Hz - 15kHz (±3dB)
63Hz - 10kHz (± 3dB)
SQ enabled: 80dB; SQ disabled
SQ enabled: 80dB; SQ disabled 50dB
60dB
<2% total harmonic distortion (THD) <2% total harmonic distortion (THD) at
at 80% deviation
80% deviation
Rear panel. Female-XLR and 1/4 in combo connector, balanced, 0/-55dBu
(line/mic) nominal input level adjustable, -30/+21dBu (mic/line) maximum
input level, impedance 20k/1k ohms (line/mic), phantom power +12VDC
Rear panel. (2) Phono connectors, unbalanced, -10/+10dBu nominal input
level adjustable, +30dBu maximum, impedance 100k ohms
Combined Audio Output (Mix)
Headphone Output
Front Panel
Controls
Rear Panel
Internal Adjustments
Programming
Indicators
Power
Power Supply Type
Power Supply Input
Power Supply Output
Power Supply Connector
Compliance
In-line power supply, Listen part number LA-201
120VAC, 60 Hz, 19 watts
15VAC, 1000mA
.02 in (5.0mm) OD x .01 in (2.5mm) ID, barrel type
UL Listed
Unit Weight with LA-201 Power Supply
Rack Mounting
Power, Test Tone on/off, Channel up/down, Input Level, Mix Level, Contour,
Headset Level
Input 1 Level (Line, Mic, Mic-Phantom Power), Input 2 Level (-10/+10 dBu), RF
Power (low, mid, high)
Compression ratio for audio processor
SQ on/off, Processing on/off
8 Green, 2 Red
Indicated by a green LED when on
Indicated on the LCD Display
Red LED illuminates when the unit is powered up
Channel designation, lock status, RF Power Level
Red LED illuminates when test tone enabled
Shipping Weight
Environmental
Front panel. (1) 3.5mm connector, unbalanced, adjustable output level,
+14dBu maximum, impedance 10 ohms. 350mW, 32 ohms, 3.5mm stereo.
Input 1 and Input 2, Mix VU Meters
SQ and Processing
RF Power
Power
LCD Display
Test Tone
Dimensions
Unit Weight
Physical
Rear panel. (2) Phono connectors, unbalanced, 0dBu nominal output level,
+19dBu maximum, impedance 10 ohms.
Temperature - Operation
Temperature - Storage
Humidity
8.0 in (20.3cm) W x 8.0 in (20.cm) D x 1.75 in (4.45cm) H
3.0 lbs (1.4kg)
4.4 lbs (2.0kg)
5.0 lbs (2. kg)
1 rack unit, optional rack mount not included.
Order Listen part number LA-326.
-10 C (14 F) to +40° (104 F)
-20 C (-4 F) to +50° (122 F)
0 to 95% relative humidity, non-condensing
Block Diagram
LT-800 Block Diagram
POWER
On
Off
Red
LED
115VAC6
0 Hz
3.5MM
Stereo
CHANNEL SELECT
In-Line
Power Supply
LA-201
(provided)
Up
HEADPHONE
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
BNC
Pre-emphasis
Processing
SQ
Companding
ANTENNA
Green
LED
Low
Functions controlled by the CPU
Module
Mid
On
High
RF POWER
Off
On
Off
SQ
Input 1 VU
Meter
Green
LED
MIX LEVEL
PROCESS
CONTOUR
Input 2 VU
Meter
Input Level
Front Panel
12VDC
Mic
Line
Mic
Phantom Pwr
Input 1 Level Select
Mic-Phantom Pwr, Mic, Line
Input 2 Level Select
+10dBu/-10dBu
+10dBu
Test Tone Button
Front Panel
-10dBu
ON
OFF
Red
LED
Female XLR-1/4"
Combo Connector
2/Tip
3/Ring
INPUT 1
Phono
Phono
400Hz
1/Sleeve
INPUT 2
MIX OUTPUT
TEST TONE
Quick Reference
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
Adjust audio input levels of
Input 1 and Input 2 here.
See page 7 for more
information
Power
ON / OFF
Indicates audio input
level of Input 1 and
Input 2
Shows mixed
audio level
Test Tone: Activates a
tone to aid system setup
Mix Level: Adjust so
the Mix Level meter
occasionally lights the
red LED
LCD: Shows
which channel
is selected
Indicates
Super Quiet
mode is
active
Contour: Equalization
adjustment. Turn
counter-clockwise for
voice and clockwise for
music
Channel Select Up:
Press for 3 seconds to
lock on current
channel
Monitor Port: Plug
in a headset and
adjust volume
Channel Select Down:
Press for 8 seconds to
enter program mode.
See page 7 for more
information
LT-800 Back Panel: Connections & Settings
Remote Antenna Connection:
See page 19 or the Listen
website for details on antennas
that can be attached here
Mix Output: These
connectors contain a mix of
Input 1 and Input 2. They are
unbalanced phono connectors;
and the output level is -10dBu
Set RF Power level here (¼, ½ and
Full). See page 6 for guidelines on
The Listen LA-201
setting power levels
power supply
connects here
Input 2: Set switch to
match the level of your
Input 2 audio source, not
used to increase or
decrease level by ±10dBu
Input 2: Connect unbalanced
audio to these phono
connectors, input level -10dBu
or +10dBu
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 -55dBu, +12VDC
supplied in PH Power position. If
not using input 1, leave in line
position.
Setup
LT-800 Setup Instructions
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.
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-201, an inline transformer, is the
approved power supply
for this unit).
NOTE: If rack mounting, you will need to use a rear connection
antenna.
Rack Mount with dual unit installed
Shown with LR-100 and LT-800
Rack Mount with single unit installed
Shown with LT-800
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
rubber plug
to the top
connector. See
page 19 for
antenna options,
or refer to the Listen
LT-800 shown with top mount antenna
website for remote
connected through top of unit
antenna options.
(part numbers LA-101,
LA-106 (72 MHz) or
LA-102 (216 MHz)
Coax antenna connection.
Rear of LT-800 shown.
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-800216, it is more convenient to use Phonak receivers
with Listen transmitters. (www.phonak.com)
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.
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.
LA-122 Remote Antenna
See RF Reception Maximization
Strategies and Coaxial Cable on
page 10.
Setup
LT-800 Setup Instructions continued
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 9.
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
LED lit when Process
is enabled
between SQ On and Off.
If the green LED is
LED lit when
SQ is enabled
displayed 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.
Set RF Power
Set the RF POWER switch on the back of the unit to
Full, ½ or ¼ (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 transmitter’s output power to its lowest
level to reduce the possibility of interference.
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 ¼” 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 balanced
XLR or ¼” phono connector.
Line
Back of LT-800 with XLR connected to Input 1
Mic
Mic with
Phantom
Power
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.
XLR Wiring
¼” Phone Wiring
- +
Full
power
½
power
Back of LT-800 unit
¼
power
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.
Power Unit On
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 11 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 5. (for a more detailed
description of Basic and Expanded Mode refer to page 9)
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.
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
LT-800 Operation
LT-800 Operating Instructions
LT-800 Audio Control
Adjust Audio Input Level
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 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.
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.
LT-800 Compatibility
LT-800 Compatibility with Other Manufacturers
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 12-14) 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 5 to set
Channel Mode and page 14 for specific channel designations.
Listen SQ™/Modes
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 6 to enable or disable SQ (Super Quiet).
SQ Summary
· SQ is NOT squelch
· SQ improves noise
performance by at least
20dB
· 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.
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.
RF Reception/Coaxial Cable
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 6).
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, 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 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.
10
*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.
Channel Selection
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.
If you are using multiple channels follow this process:
1. Same Space If you are using multiple transmitters in the same space, the high-
est number of channels that will work simultaneously is six at 72 MHz and three
at 216 MHz. With all of the transmitters off, listen for interference on all the
wide band channels with a Listen receiver. Using the frequency compatibility
tables on pages 12-13, 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.
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 1213) 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.
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
The LT-800 at 72 MHz operates on 17
wide band channels and 40 narrow band
channels.
· Letters= Wide Band Channels
(Example: E)
· Numbers= Narrow Band Channels
(Example: 32)
At 216MHz
The LT-800 at 216 MHz operates on 19
wide band channels and 38 narrow band
channels.
· “2” as left digit= Wide Band
·
Channel
(Example: 2C)
“1” and “3” as left digits= Narrow
Band Channels (Examples: 1A; 3R)
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.
11
72 MHz Compatibility Chart
72 MHz Compatibility Chart
Frequency
MHz
72.0250
72.0500
72.0750
72.1000
72.1250
72.1500
72.1750
72.2000
72.2250
72.2500
72.2750
72.3000
72.3250
72.3500
72.3750
72.4000
72.4250
72.4500
72.4750
72.5000
72.5250
72.5500
72.5750
72.6000
72.6250
72.6500
72.6750
72.7000
72.7250
72.7500
72.7750
72.8000
72.8250
72.8500
72.8750
72.9000
72.9250
72.9500
72.9750
74.6250
74.6500
74.6750
74.7000
74.7250
74.7500
74.7750
75.2250
75.2500
75.2750
75.3000
75.3250
75.3500
75.3750
75.4000
75.4250
75.4500
75.4750
75.5000
75.5250
75.5500
75.5750
75.6000
75.6250
75.6500
75.6750
75.7000
75.7250
75.7500
75.7750
75.8000
75.8250
75.8500
75.8750
75.9000
75.9250
75.9500
75.9750
12
Listen
Phonic
Ear
Comtek Phonak
A1
A2
A3
A4
K5
K6
B7
B8
N9
10
11
10
11
10
11
N0
C1
12
13
12
13
12
13
C2
O2
14
15
14
15
14
15
D5
16
17
16
17
16
17
D6
P7
18
19
18
19
18
19
P8
E9
20
33
20
33
20
33
E0
E3
34
35
34
35
34
35
E4
I5
36
37
36
37
36
37
I6
I7
38
39
38
39
38
39
I8
J9
40
21
40
21
40
21
J0
R1
22
23
22
23
22
23
R2
F3
24
25
24
25
24
25
F4
S5
26
27
26
27
26
27
S6
G7
28
29
28
29
28
29
G8
T9
30
31
30
31
30
31
T0
H1
32
32
32
H2
*Parenthesis indicate T35 and T20 narrowband.
Williams* Gentner
(11, 1)
(2)
(12, 3)
A, (13, 4)
(14, 5)
(6)
(15, 7)
K, (8)
(16, 9)
(10)
(17, 11)
B, (18, 12)
(19, 13)
(14)
(20, 15)
N, (16)
(21, 17)
(18)
(22, 19)
C, (23, 20)
10
(24, 21)
(22)
11
(25, 33)
O, (24)
12
(26, 25)
(26)
13
(27)
D, (28)
14
(29)
(30)
15
(30, 31)
P, (32)
16
(31, 33)
(34)
17
(32, 35)
E, (33, 36)
18
(34, 37)
(38)
19
(35, 39)
(36, 40)
(41)
20
(37, 42)
I, (38, 43)
21
(39, 44)
(45)
22
(40, 46)
(41, 47)
(48)
23
(42, 49)
J, (43, 50)
24
(55, 51)
(52)
25
(45, 53)
R, (54)
26
(46, 55)
(56)
27
(47, 57)
F, (48, 58)
28
(49, 59)
(60)
29
(50, 61)
S, (62)
30
(51, 63)
(64)
31
(52, 65)
G, (53, 66)
32
(54, 67)
(68)
33
(55, 69)
T, (70)
34
(56, 71)
(72)
35
(57, 73)
H, (58, 74)
36
(59, 75)
(76)
37
(60, 77)
Telex
Drake
72.1
72.2
72.3
72.4
72.5
72.6
72.7
72.8
72.9
75.5
75.6
75.7
75.8
75.9
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 9 for more information).
216 MHz Compatibility Chart
216 MHz Compatibility Chart
Frequency
MHz
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
Listen
1A
2A
3A
1B
2B
3B
1C
2C
3C
1D
2D
3D
1E
2E
3E
1F
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
2V
3V
Phonic
Ear
41
42
43
44
45
46
47
48
49
51
52
53
54
55
56
57
58
59
60
Comtek
41
42
43
44
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
Phonak Williams Gentner
41
21
42
43
22
23
44
45
24
25
46
12
13
47
26
27
48
16
17
49
18
61
29
10
62
28
52
11
64
65
53
12
81
82
54
13
68
69
55
14
83
84
56
15
72
73
57
76
85
58
86
77
59
88
79
60
80
CSI
AVR
C01
Light
Speed
N01
10
C05
14
C09
N09
C12
N12
11
15
C18
C21
N18
C24
C25
N64
18
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 9 for more information).
12
16
C29
19
C32
C33
N72
C37
N77
13
17
C39
C40
N80
13
Phonak Compatibility Chart
Phonak Frequency Chart
Frequency
MHz
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
14
Listen
1A
2A
3A
1B
2B
3B
1C
2C
3C
1D
2D
3D
1E
2E
3E
1F
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
2V
3V
Phonak
41
21
42
43
22
23
44
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
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 9 for more information).
Troubleshooting
LT-800 Troubleshooting
The LT-800 has no power
Make sure the LA-201 power transformer 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 6
to set, page 9 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 6).
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 6).
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 a 3 seconds (see page 7).
15
LT-800 Troubleshooting
LT-800 Troubleshooting
I’m using another brand of receiver - how do I tell which channel to use
Refer to Listen’s Frequency Compatibility Tables (pages 12-13). 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 6).
If you are using Phonak receivers, the transmitter is capable of operating in the
Phonak mode (please refer to page 5).
Several transmitters are operating in the same environment
For this, you’ll need to choose your transmitting frequencies carefully. See page 11
for more details.
Can I have two antennae 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.
16
Compliance/FCC
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 user’s 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.
17
Warranty/Contact
Warranty
Listen Technologies Corporation (Listen®) warrants the LT-800 Stationary
Transmitter 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. 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, U.S.A. Listen
will only accept returned products with prepaid shipping and with a return
merchandise authorization number (RMA). To receive a return merchandise
authorization number call 1.800.330.0891 or 1.801.233.8992. Please see
www.ListenTech.com or contact Listen for complete warranty details.
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 Sandy, Utah U.S.A. and are open
Monday through Friday, 8am to 5pm Mountain Time.
Address:
18
8535 South 700 West
Suite A
Sandy, UT 84070-2515
U.S.A.
Phone:
1.801.233.8992
1.800.330.0891 (North America)
Fax:
1.801.233.8995
Web Site:
www.ListenTech.com
Email:
techsupport@ListenTech.com
Optional Accessories
Optional Accessories
Antenna Options
Telescoping
(Top Mount)
LA-106 for 72 MHz or
LA-102 for 216 MHz
72 MHz Helical
(Top Mount)
LA-101 for 72 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
mounting configurations; and 25 feet (7.6m)
of RG-58 coax cable.
90 Degree Helical
216 MHz Ground Plane
(Rear Mount)
LA-123 for 72 MHz or
LA-124 for 216 MHz
(Remote Mount, outdoor)
LA-107 for 216 MHz
Rack Mount Options
LA-326 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.
Antenna Kit for the
LA-3
326 Rack Mount Kit
LA-125 for 72 MHz and LA-126 for 216 MHz
(LA-326 also required)
19
Optional Accessories
Optional Accessories continued
Cable & Connectors Options
RG-58 Coaxial
Cable
LA-112
Installation of BNC
Connectors
BNC Connector
for RG-58
BNC Connector for
RG-8
LA-114
LA-127
LA-128
RG-8 Coaxial
Cable
LA-113
available by the foot
Microphone Options
LA-268
LA-261
Lapel
Over-the-Head
Over-the-Ear
Noise Cancelling
LA-261
LA-262
LA-268
LA-270
Hand Held
Collar
Conference
LA-274
LA-276
LA-277
Behind-thehead
Phono
Converter
LA-278
LA-280
NOTE: To use Listen microphones you must use a converter (LA-280) to adapt the 3.5 mm connection to a ¼” phono
connection.
20
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 U.S.A.
Telephone: 1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: 1.801.233.8995
E-mail: info@ListenTech.com

---

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