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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 North America
+ 1.801.233.8995 Fax
support@listentech.com
www.listentech.com
Listen Technologies GmbH
Jasminstr. 16
905 22 Oberasbach, Germany
+49 911 955159 0
+49 911 955159 40
Tel
Fax
www.listentech.de
info@listentech.de
Thank you and enjoy your listening experience!
Best regards,
Russell Gentner and the Listen Team
Lifetime Warranty – the best in the business!
Listen’s full-time technical support is passionate about what they do and you can depend
on them to solve any equipment issues with confi dence. 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.
The Word Around Listen
“ 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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Stationary FM Table of Contents
Design Guide
FM Technology Overview 5
System Overview 6
Key Concepts in Designing an FM System 8
Notes 17
LT-800-863 Stationary FM Transmitter
Specifi cations 25
Block Diagram 26
Quick Reference 27
Setup Instructions 28
Operating Instructions 30
Accessories 34
Notes 35
LR-400/500-863 FM Receivers
Specifi cations 45
Block Diagram 47
Quick Reference 48
Setup Instructions 50
Operating Instructions 53
Programming Instructions (LR-500 only) 59
Accessories 60
Notes 61
Design Guide
LT-800
Supplementary Information
Battery Charging Information 69
Frequency Chart 70
Troubleshooting 71
Frequently Asked Questions 73
Compliance, Warranty and Contact Information 75
Notes 76
LR-400/500
Supplementary
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Stationary FM Design Guide Table of Contents
Table of Contents 3
Technology Overview 5
System Overview 6
Key Concepts in Designing an FM System 8
Notes 17
Design Guide
3
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Frequency Modulation (FM) Technology Overview
Frequency modulation or (FM) is a means of transmitting audio using electromagnetic waves.
This same technology is used by local FM radio stations to broadcast music. FM signals can travel through
most barriers – walls, fl oors, and ceilings. The distance a signal travels has many different variables such as
Radio Frequency (RF) output power, the type and placement of the antenna, and the broadcasted
frequency. Unlike infrared, FM transmission are not secure. This enables a receiver to travel further distances
from the source. This section of the manual will help you design a system that will get the best range and least
amount of interference.
FM Receiver
Audio Source
FM Transmitter
When designing an FM system it is important to keep the following in mind:
Design Guide
• Multipath
Multipath interference is a form of RF interference that occurs when radio signals have more than one path
between the receiver and the transmitter causing the two RF signals to add out of phase. This could occur in areas with
RF-refl ective surfaces, such as furniture, walls, or fl oors. The result of multipath is the receiver audio coming in and out of
squelch when the receiver is moved. Portable applications are much more susceptible to multipath than those that are
stationary. Multipath distortion is often worse as the distance between transmitter and receiver increases
(RF power decreases). Multipath can decrease the audio quality of the transmission.
• Antenna placement
The antenna should be placed as high as possible and in line of sight of the receivers. The antenna should not be
mounted near metal objects. Keeping the coaxial cable as short as possible will also limit the loss of RF power.
The LT-800 comes equipped with an articulating right angle dipole antenna (LA-129). The remote antenna kit
(LA-130) is an optional accessory. The antenna on the receivers should always be in the upright position to maximize
the transmission range. Placing the antenna in areas where the RF cannot properly be transmitted will limit the range
of transmission.
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System Overview
Design Guide
There are four main parts to a Stationary FM system – transmitter, antenna, receiver and input source, .
LT-800-863 Stationary FM Transmitter (863 MHz)
Input source
LA-129 90° Articulating Antenna (863 MHz)
(Included with Transmitter)
Input Source
The input source can be audio from a sound board, microphone or a personal audio source like a CD player,
MP3 player, computer, DVD, etc. Audio will be Connected into the audio inputs of the stationary transmitter.
Transmitter
The LT-800 transmitter modulates the audio on an FM carrier and transmits the signal via an antenna.
LR-400-863
Portable Display FM
Receiver (863 MHz)
LR-500-863
Portable Programmable
Display FM Receiver
(863 MHz)
LA-129
6
LA-130
LT-800
Page 13
System Overview
Antenna
There are a several options for antennas. Antennas can either be back-mounted on the
unit or remote mounted.
LA-129 90° Articulating Antenna (863 MHz)
(Included with Transmitter)
Design Guide
LA-130 Remote Antenna Kit (863 MHz)
Receivers
Listen offers two different portable receivers: the LR-400 and LR-500.
LA-131 Antenna Kit for Rack Mount (863 MHz)
LR-400-863
Portable Display FM
Receiver (863 MHz)
LR-500-863
Portable Programmable
Display FM Receiver
(863 MHz)
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Key Concepts in Designing a Stationary FM System
Input Selection
Design Guide
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, and input 2 is two unbalaned 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.
Balanced XLR or
1/4” phono connector
Unbalanced right
and left phono
connectors
Input 1: Connect the audio source(s)
Connect the audio source(s) to one or both audio input connections. Input 1 offers a choice of balanced
XLR or ¼” 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). A feed from a soundboard can also
used with Input 1. Be sure the input type selected (line, mic or mic-PH PWR) matches with the output type. The
following is a wire diagram for Input 1 balanced and unbalanced connections:
1/4”Phone Wiring
Balanced
Sleeve
Top Ring Top Ring/Sleeve
Balanced
Audio
Source
Tip
Ring
Sleeve
Audio from
Unbalanced
Unbalanced
Audio
Source
Balanced
Audio
Source
XLR Wiring
Input from
Unbalanced
Audio
Source
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Key Concepts in Designing a Stationary FM System
Input 2: Connect the audio source(s)
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.
Using Two inputs
The LT-800 can accommodate two inputs simultaneously with the use of the input level potentiometer.
When two inputs are present, both sets of input level lights will be activated.
Design Guide
Mix Level
The mix level acts as the “master transmit” control. It will increase the transmit gain on the “mix” of the two
levels (if two levels are in use).
Input Level Knob
Mix level adjustment
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Key Concepts in Designing a Stationary FM System
Selecting Transmitting Frequencies
Design Guide
Use this section of the guide to choose the channel settings for the transmitter and receivers.
Testing System
Find transmission channel(s)
The goal is to fi nd a transmission channel(s) that is free from interference. Interference comes from other
transmitters and from other equipment (such as a computer).
Listen’s LT-800-863 o ers 17 di erent channels to choose from
Listen’s LT-800-863 offers 17 different channels to choose from. This increases the chance you’ll fi nd an
interference free channel. The best way to check for interference is to turn a receiver on and press the SEEK
button. If there are any channels with interference, the receiver will fi nd these channels. Do not transmit on
these channels.
Monitor Jack
The headphone jack is used to monitor the mix of input 1 & 2. You can adjust the monitor level with the volume
knob. The headphone jack is a standard 3.5 mm jack.
Test Tone
Use the test tone to transmit a 400 Hz tone. This tone will allow the end user to know if the system is transmitting
properly. All receivers should be able to hear this tone if tuned to the proper channel.
10
Headphone
monitoring jack
Test Tone Button
Page 17
Key Concepts in Designing a Stationary FM System
Antenna placement (rear or remote)
Rear mounted antenna
Rear mounting the LA-129 90° Articulating Antenna (863 MHz) will allow the transmitter to be moved if necessary.
Design Guide
Remote antenna
The LA-130 Remote Antenna Kit connects to the LT-800 and can be placed away from the transmitter for better
range. It also allows the unit to be rack mounted with the antenna remotely using the LA-326 Universal Rack
Mounting Kit. The LA-130 comes with 25’ of black coaxial cable (RG-58)
ATTENTION: Long cable runs can result in signal degradation due to the “loss” characteristics of
the cable. Minimize cable runs as much as possible or use “low loss” RG-8 cable.
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Key Concepts in Designing a Stationary FM System
Front of the rack mounted antenna
Design Guide
The antenna can also be in the front of the rack with the use of the LA-131 Antenna Kit for Rack Mount
(863 MHz) and the LA-326 Universal Rack Mounting Kit.
Maximizing Transmission Range
For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the
originating transmitter. The following strategies should be used maximize this signal:
Transmitting and receiving antennas
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. Eliminate or minimize obstructions between the
transmitting and receiving antenna. Minimize the distance between the transmitting and receiving antennas.
Move transmitting and receiving antennas away from metal or conductive objects.
Antenna Placement
Place the transmitting antenna as high as possible. The antenna should always be oriented upwards. If the
height of the antenna exceeds 7.6 m (25 ft.), the antenna should be placed with the radial facing downward
(as shown in diagram).
CAUTION: When installing antennas, ensure the antenna is clear of power lines.
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Key Concepts in Designing a Stationary FM System
Orientation
Orient both transmitting and receiving antennas vertically.
RF Power switch
Position the RF Power switch on the back of the LT-800 to full RF Power, unless lower power is necessary.
Design Guide
RF Power Switch
Cable Length
Keep coaxial cable from transmitter to antenna as short as possible.
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Key Concepts in Designing a Stationary FM System
Mounting Transmitter
Design Guide
The LT-800 can be rack mounted if necessary. With the use of the Listen LA-326 Universal Rack Mount Kit, you
can mount one or two transmitters to the standard 19” rack. The rack mounted unit will take 1 ru of space.
Rack Mount with dual units installed.
Rack Mount with single unit installed.
NOTE: The antenna may need to be remote mounted using the LA-130 Remote Antenna Kit if the
transmitter(s) is rack mounted. If a rack is metal, it is not recommended to have the antenna inside. Also,
the depth of the rack and equipment inside could prevent an antenna from being placed inside.
The LA-131 rack mount accessory will allow you to place your LA-129 antenna at the front of the rack. Having
the antenna in the front will give better reception range.
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Key Concepts in Designing a Stationary FM System
Multiple Channels
Guidelines for multiple channels in multiple and single spaces.
Example #1
A museum patron walks to an exhibit and needs to listen to one channel at a time.
In general, such systems work very well because of what is called “capture effect”. A Listen receiver will lock
onto or “capture” the strongest FM signal. If the receiver is near a dominating transmission signal, it will ignore
other interference – even if it is on the same channel. In theory, you can have an infi nite number of
transmitters operating in this scenario. However, to reduce the possibility of the receiver accidentally receiving
interfering transmissions, use the following guide lines:
• Reduce the transmission power on the rear of the LT-800 Stationary Transmitter to the lowest level possible.
• Get the transmitting antenna as close to the receivers as possible.
• Increase the squelch threshold on the receivers if necessary.
• Choose adjacent broadcast channels with the highest channels spacing. Try to get the channel spacing to
be at least 300 KHz apart.
• Receiver DX and Local –
DX Mode – Both strong and weak channels will be automatically tuned. This will increase the range of
the transmission.
Local mode – Only strong channels will be automatically tuned in.
Design Guide
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Key Concepts in Designing a Stationary FM System
Example #2
Meeting participants need to select any one of, say, four language interpretations of the meeting.
Design Guide
• In general, space the channels as far as possible from each other. For example, if four channels are needed
from transmitting signals, using channels 1, 4, 8, and 12 would be recommended (please see the channel/frequency chart on page 70 for the list of frequencies).
• Space the antennas at least one wave length from each other. A wave length at 863-864 MHz is 33 cm (13 in.).
• In these applications, it would be benefi cial to use the LR-500-863 Portable Programmable Display FM Receiver
(863 MHz) to “lock out” any unwanted channels. The receiver would only see the frequencies currently being
used within the room.
• DX and Local mode can be used for the receiver to SEEK and fi nd only the strongest signals.
16
Spanish
French
Chinese
English
Page 23
Notes
Design Guide
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Notes
Design Guide
18
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LT-800 User’s Manual Table of Contents
Specifi cations 25
Block Diagram 26
Quick Reference 27
Setup Instructions 28
Operating Instructions 30
Accessories 34
Notes 35
LT-800-863 Package Contents
• LT-800-863
• Quick Reference Sticker
• LA-129 90° Articulating Antenna
• 12 VDC Power Supply
• Line Cord
• Quick Reference Card
• Warranty Card
• Manual Card
LA-129 90° Articulating Antenna (863 MHz)
LT-800LT-800
LT-800-863 Stationary FM Transmitter
12 VDC Power Supply
Listen Confi gurations
• LT-800-863-01 (North America)
• LT-800-863-02 (Asia/UK)
• LT-800-863-03 (Euro)
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Page 31
LT-800 Specifi cations
Architectural Specifi cation
The Stationary FM Transmitter shall be capable of broadcasting on 17 channels. Channel tuning shall be capable of being locked.
The transmitter shall have a SNR of 70 db or greater. The output power shall be adjustable to quarter, half or full. The device shall
have an audio frequency response of 50 Hz to 15 kHz, +/-3 db. It shall have 2 mixing audio inputs and a mixed signal output.
The device shall have the following audio controls: Input Levels, Mix Level, adjustable low pass fi lter (contour), headphone output
(monitor). The device shall have an audio processor that is capable of automatic gain control and limiting.
The Listen LT-800-863 is specifi ed.
RF
Audio
Controls
Indicators
RF Frequency Range 863.050 - 864.950 MHz
Specifi cations LT-800-863
Number of Channels 17 Wideband
Frequency Accuracy +/-.005% stability 0- 50C
Transmitter Stability 50 PPM
Output Power 10mW ERP
Peak Deviation +/- 50 kHz
Antenna LA-129 90° Articulating Antenna (863 MHz)
Antenna Connector BNC
Compliance CE, ETSI, RoHS
System Frequency Response 50Hz - 15kHz (+/-3 db)
System Signal to Noise Ratio 70db (A-Weighted)
System Distortion <2% THD @ 80% modulation
Audio Input 1
Audio Input 2
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 5kHz
Combined Audio Output (Mix)
Headphone Output (Monitor)
Front Panel Power, Test Tone on/off, Channel up/down, Input Levels, Mix Level, Contour, Monitor volume control
Rear Panel
Internal Adjustments Compression ratio for audio processor
Programming Process on/off, Channel lock
Input 1, 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 enable
Rear Panel. Female XLR and 1/4 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 +12VDC
Rear Panel. (2) Phono Connectors, unbalanced, -10/+10dbu nominal input level adjustable, +30 dBU
maximum, impedance 100K ohms
Input 1 and Input 2 Mixed Output (Rear Panel). (2) phono connectors, unbalanced, -10 dBU nominal
output level, +19dbu maximum, impedance 10 ohms
Front Panel. (One) 3.5 mm stereo connector, unbalanced, adjustable output level, +7dbu maximum,
impedance 10 ohms. 100mW, 32ohms
Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10/+10dbu), RF power level (low, mid,
high)
d.
LT-800LT-800
Power Supply
Power
Power Line Cord (detachable)
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
Physical
Environmental
Unit Weight 2.7 lbs (1.10 kg)
Unit Weight with LA-207-03 Power Supply 2 lbs.14 oz. (1.30 kg)
Shipping Weight 3 lbs. 2oz. (1.42 kg)
Rack Mountin
Temperature - Operation -10C (14F) to +40C (104F)
Temperature - Storage -20C (-4F) to +50C (122F)
Humidity 0 to 95% Relative Humidity, non condensing
g
In line switching mode supply, Listen part number LA-206
Input: 100-240 VAC, 47-63 Hz
Output: 12 VDC, 1.3A
Output Connector: .02 in (5.0mm) OD, .01 in (2.5 mm) ID, barrel typ
Compliance: UL, CUL, PSE, TUV, CB, CE, RoHS
North America, Type B, (LT-800-863-01)
Asia, UK, Type G, (LT-800-863-02)
Euro Type J, (LT-800-863-03)
One rack space height, 1/2 rack space wide. One or two transmitters can be mounted in one rack space.
Optional Rack mount (LA-326) and LA-131 antenna kit for rack mount not included.
Specifi cations are subject to change without notifi cation
e
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LT-800-863 Block Diagram
POWER
On
Off
LT-800LT-800
115/230VAC
50/60 Hz
Functions controlled by
the CPU Module
Universial Power
Supply (provided)
ANTENNA
BNC
Input 1 VU Meter
12VDC
Mic
Phantom Pwr
Mic
12VDC, 1.3A
Transmitter
RF Board
Low High
Mid
RF POWER
Line
Power Supply
CPU Module
Pre-emphasis Companding Processing
Input 2 VU Meter
Input Level
Front Panel
Input Level
Select Mic-Phantom Pwr, Mic, Line
Input Level
Select Mic-Phantom Pwr, Mic, Line
MIX Level
VU Meter
+10dBu
Down
Listen LCD
Display Backlit
-10dBu
MIX LEVEL
Green LED
Volume
Compression Ratio
(internal ajustment)
On Off
OFF
Test Tone Button
ON
Red LED
MONITOR
CONTOURPROCESS
Front Panel
1/Sleeve3/Ring2/Tip
INPUT 1 INPUT 2 MIX OUTPUT TEST TONE
26
Female XLR 1/4’
Combo Connector
Phono Phono
400Hz
Page 33
LT-800-863 Quick Reference
Input Level Indicators: Shows audio Input 1 and Input 2 levels.
Mix Audio Level: Shows mixed level.
Input 1 and 2:
Adjust audio input
levels of Input 1
and Input 2 here.
Process LED: Indicates audio processing
mode is active.
Monitor Jack:
Plug in a headset to monitor audio.
Test Tone: Activates a
tone to aid system setup.
Power: ON/OFF
Power Input: Connect power
supply (included) here.
LCD Display:
See LCD display quick
reference
Contour: Equalization
adjustment; boosts or
cuts high frequencies.
Mix level: Adjusts mixed
audio levels.
Audio Outputs: Input 1 and
input 2 mixed audio outputs.
Input 2 Unbalanced:
Audio inputs; stereo or
mono.
Channel Select
LT-800LT-800
Up and Down:
Use to select
channel.
Buttons also
used for
programming
functions.
Input 2 Level Switch: Set
switch to match the level
of your Input 2 source.
RF Power Level:
Low, med or high
RF power.
RF Antenna
Output: BNC
connector for
antenna (50 ohm)
RF Output Indicator:
Indicates transmitter
is outputting RF.
Program Mode: Indicates the unit is
in program mode.
Channel Display: Displays what
channel the LT-800 is currently on.
Lock Icon: Indicates the unit is
locked on current channel.
Input 1 Level Switch:
Set switch for line or
mic level. Phantom
power available in
Mic-PH power
position.
Input 1: Balanced
input for connection
of a line level or
microphone;
accepts either a XLR
or ¼” phono plug.
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Page 34
LT-800 Setup Instructions
Unpack the Product
1
Remove outer packaging and plastic cover. Verify all components are present and no physical
damage has occurred to the product.
Mount LT-800(s) in Rack (if desired)
2
If rack mounting the transmitter(s), install the optional rack mount kit (part LA-326) according to the
instructions included with the kit.
LT-800LT-800
Connect Antenna
3
Connect Power
4
Rack Mount with single unit installed.
Connect antenna to rear of transmitter, remotely or rack mount.
Plug the power supply into the power connector on the back panel and then plug the power supply
into an outlet. Only use a Listen approved power supply (12 VDC).
Rack Mount with dual units installed.
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LT-800 Setup Instructions
Set RF power
5
Set the RF POWER switch on the back of the unit to Full, ½ or ¼ (Level is indicated on the LCD
display by number of dots above Listen logo). 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.
Low, med or high RF power
LT-800LT-800
Connect Audio Inputs
6
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.
6A
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. 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
Balanced
Audio
Source
Input from
Unbalanced
Audio
Source
1/4” Phone Wiring
Balanced
Sleeve
Top Ring Top Ring/Sleeve
Balanced
Audio
Source
Tip
Ring
Sleeve
Audio from
Unbalanced
Unbalanced
Audio
Source
6B
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
LT-800LT-800
Select a Channel
2
Lock on Channel
3
Power Button
Select the transmit channel by pressing the channel select UP and DOWN buttons.
Channel select up and
down buttons
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.
30
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LT-800 Operating Instructions
Test Tone (if necessary)
4
Use the test tone to transmit a 400 Hz tone. This tone will allow the end user to know if the system is
transmitting properly. All receivers should be able to hear this tone if tuned to the proper channel.
LT-800LT-800
Adjusting Audio Levels
1
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 transmit signal. 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.
Test Tone Button
Audio Input Level Knob
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Page 38
LT-800LT-800
LT-800 Operating Instructions
2
Adjusting the Contour knob
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
Contour Knob
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.
32
Mix Level Adjustment Knob
Page 39
LT-800 Operating Instructions
4
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.
LT-800LT-800
Process
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Page 40
Accessories for LT-800-863
Accessories
LT-800LT-800
LA-131
Antenna Kit for Rack Mount (863 MHz)
(01)
(02)
(03)
LA-207
12 VDC Power/Charging
Supply for FM Portable Products
LA-207-01 North America
LA-207-02 Asia/UK
LA-207-03 Euro
LA-130
Remote Antenna Kit (863 MHz)
LA-304
Assistive Listening
Notifi cation Signage Kit
LA-326
Universal Rack Mounting Kit
34
Page 41
Notes
Design Guide
35
Page 42
LT-800LT-800
Notes
36
Page 43
Notes
LT-800LT-800
37
Page 44
LT-800LT-800
Notes
38
Page 45
Page 46
Page 47
Page 48
Page 49
LR-400/500 User’s Manual Table of Contents
Specifi cations 45
Block Diagram 47
Quick Reference 48
Setup Instructions 50
Operating Instructions 53
Programming Instructions (LR-500 only) 59
Accessories 60
Notes 61
LR-400/500 Package Contents
• LR-400/500
• Quick Reference Card
• Warranty Card
LR-400-863
Portable Display
FM Receiver
(863 MHz)
Listen Confi gurations
• LR-400-863
• LR-500-863
LR-400/500
LR-500-863
Portable Programmable
Display FM Receiver
(863 MHz)
Page 50
Page 51
LR-400-863 Specifi cations
Architectural Specifi cation
The LR-400-863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of
70 dB or greater. The device shall be able to be locked on a single channel. The receiver shall be
capable of seeking channels. The device shall have an adjustable squelch. The device shall have an
audio frequency response of 50 Hz to 15 KHz, ±3 dB. The device will incorporate a stereo headset jack
that allows the user to plug in either a mono or stereo headset. The device shall incorporate an LCD
display that indicates channel, battery level, low battery, battery charging, and RF signal strength.
The receiver shall be able to function in both DX and Local mode. The unit shall operate off of 2 AA
batteries. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH
batteries. The Listen LR-400-863 is specifi ed.
Specifi cations LR-400-863
RF Frequency Range 863.050 - 864.950 MHz
Number of Channels 17 Wideband
Sensitivity .6 uV typical, 1 uV maximum for 12 dB sinad
RF
Audio
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50º C)
Antenna Integrated External Antenna
Squelch
Compliance CE, ETSI, RoHS
System Frequency Response 50 Hz - 15 kHz (+/-3 dB)
System Signal to Noise Ratio 70 dB (A-Weighted)
System Distortion <2% total harmonic distortion (THD) at 80% deviation
Output
Programmable in 20 steps, automatic on loss of RF signal
3.5 mm connector, unbalanced, 0dBu nominal output level, 16
mW maximum, impedance 32 Ohms
Controls
Indicators
Power
Physical
User Controls Channel up/down, SEEK, volume
Set-up Controls (battery compartment) Alkaline/NiMH battery switch
Programming Channel Lock, DX/Local, squelch
LED
LCD Display
Battery Type Type: 2 AA batteries, alkaline or NiMH
Battery Life (Listen batteries)
Battery Charging (NiMH only) Fully Automatic, 13 hours maximum
Power Supply (LA-208)
Power Supply Connector 2.3 mm OD by .7 mm ID, barrel type
Power Supply Compliance RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant
Dimensions (H x W x D) 5.0 x 3.0 x 1.0 in (13 x 7.6 x 2.5 cm)
Color Dark Grey with white silk screening
Unit Weight 3.9 oz (111 g)
Unit Weight with batteries 5.8 oz (164 g)
Shipping Weight 1.0 lbs. (0.45 kg)
Door
Red, illuminated when unit is on. Flashes when batteries are
low, or Charging. Flashes when locked and SEEK is pushed.
Channel Designation, lock status, signal strength indication,
battery life
20 hours alkaline (LA-361), 10 hours NiMH rechargeable
(LA-362)
7.5 VDC, center positive 300 mA. Drop in contact points for
use with charging cases. Power supply and specifi ed line cord
not included (LA-208)
Manually Lockable. Up, down, and power buttons through
door. Other controls behind door (see controls)
LR-400/500
Temperature - Operation -10 C (14 F) to +40 C (104 F)
Environmental
Temperature - Storage -20 C (-4 F) to +50 C (122 F)
Humidity 0 to 95% Relative Humidity, non condensing
Specifi cations are subject to change without notifi cation
45
Page 52
LR-500-863 Specifi cations
Architectural Specifi cation
The LR-500-863 FM receiver shall be capable of receiving on 17 wide band channels with a SNR of
70 dB or greater. The receiver shall be programmable to electronically lock out unneeded channels.
The receiver shall be capable of seeking channels. The device shall be able to be locked on a single
channel. The device shall have an adjustable squelch. The device shall have an audio frequency
response of 50 Hz to 15 KHz, ±3 dB. The device will incorporate a stereo headset jack that allows the
user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that
indicates channel, battery level, low battery, battery charging, and RF signal strength. The receiver
shall be able to function in both DX and Local mode. The unit shall operate off of 2 AA batteries. The
receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The
Listen LR-500-863 is specifi ed.
Specifi cations LR-500-863
RF Frequency Range 863.050 - 864.950 MHz
Number of Channels 17 Wideband
Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad
RF
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50º C)
Antenna Integrated External Antenna
Squelch Programmable in 20 steps, automatic on loss of RF signal
Compliance CE, ETSI, RoHS
LT-800LR-400/500
Audio
Controls
Indicators
Power
System Frequency
Response
System Signal to Noise
Ratio
System Distortion <2% total harmonic distortion (THD) at 80% deviation
Output 3.5 mm connector, unbalanced, 0dBu nominal output level, 16
User Controls Channel up/down, SEEK, volume
Set-up Controls (battery
compartment)
Programming Channel Lock Out, Channel Lock, DX/Local, squelch
LED Red, illuminated when unit is on. Flashes when batteries are
LCD Display Channel Designation, lock status, signal strength indication,
Battery Type Type: 2 AA batteries, alkaline or NiMH
Battery Life (Listen bat-
teries)
Battery Charging (NiMH
only)
Power Supply (LA-208-03) 7.5 VDC, center positive 300 mA. Drop in contact points for use
Power Supply Connector 2.3 mm OD by .7 mm ID, barrel type
Power Supply Compliance RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant
50 Hz - 15 kHz (+/-3 dB)
70 dB (A-Weighted)
mW maximum, impedance 32 Ohms
Alkaline/NiMH battery switch
low, or Charging. Flashes when locked and SEEK is pushed.
programming
20 hours alkaline (LA-361), 10 hours NiMH rechargeable (LA-
362)
Fully Automatic, 14 hours maximum
with charging cases. Power supply not included (LA-208-03)
Dimensions (H x W x D) 5.0 x 3.0 x 1.0 in (13 x 7.6 x 2.5 cm)
Color Dark Grey with white silk screening
Unit Weight 3.9 oz (111 g)
Physical
Environmental
46
Unit Weight with batteries 5.8 oz (164 g)
Shipping Weight 1.0 lbs. (0.45 kg)
Door Manually Lockable. Up, down, and power buttons through door.
Temperature - Operation -10 C (14 F) to +40 C (104 F)
Temperature - Storage -20 C (-4 F) to +50 C (122 F)
Humidity 0 to 95% Relative Humidity, non condensing
Other controls behind door (see controls)
Specifi cations are subject to change without notifi cation
Page 53
LR-400/500 Block Diagram
115/230VAC
50/60 Hz
LCD Display
Universal
Power Supply
(not included)
ANTENNA
RF
de-modulation
Power Supply
CPU Module
Alkaline
(2) AA Batteries
ALkaline or NiMH
NiMH
de-emphasis
Companding
Q-Technology
Up
Down
Seek
Power charge indicator
Red LED
POWER
On
Off
VOLUME
3.5 mm Connector
Tip
Ring
Sleeve
LR-400/500
47
Page 54
LR-400-863 Quick Reference
Articulating Flexible Antenna
Power/Charging Port
Front Door Lock
Channel Select Buttons
3.5 mm Output Jack: Connect a listen earpiece here.
LED: When lit, indicates unit has power.
On/Off and Volume Control Dial.
Look&Listen™ Display: Shows
receive level, channel, battery
status, and lock status.
SEEK Button: Allows the
user to change channels
or lock on a channel.
Battery Select Switch: Choose
the type of batteries being
used.
Battery Compartment: Place
2-AA batteries in compartment.
Be sure to follow polarity
pattern.
LT-800LR-400/500
Channel Display: Displays the
channel the LR-400 is currently on.
RF Input Indicator:
Indicates the RF receive
level.
48
Battery Level Indicator.
Lock Icon: Indicates the unit is
locked on current channel.
Page 55
LR-500-863 Quick Reference
Articulating Flexible Antenna
Power/Charging Port
Front Door Lock
Channel Select Buttons
3.5 mm Output Jack: Connect a listen earpiece here.
LED: When lit, indicates unit has power.
On/Off and Volume Control Dial.
Look&Listen™ Display:
Shows receive level, channel,
programming, battery
status, and lock status.
SEEK Button: Allows the
user to change channels
or lock on a channel.
Battery Select Switch: Choose
the type of batteries being
d.
use
Battery Compartment: Place
2-AA batteries in compartment.
Be sure to follow polarity
pattern.
Channel Display: Displays the
channel the LR-500 is currently on.
RF Input
Indicator:
Indicates the
RF receive
level
.
Program
function is in
process.
L/O: Indicates while in programming
mode the specifi c channel has
been locked out.
Lock Icon: Indicates the unit is
locked on current channel
LR-400/500
Battery Level
Indicator.
49
Page 56
LR-400/500 Setup Instructions
1
Remove the product
Remove outer packaging and plastic cover. Inspect for physical damage. If damage is apparent,
please contact the dealer from which the product was purchased or Listen Technologies Corporation
technical support for assistance (refer to page 67 for contact information).
Open the front access door
2
If locked, use a pocketknife or small screwdriver to unlock the door locks on both sides of
the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with
your thumb and index fi nger and pull the door downward. DO NOT place batteries in the
unit at this time.
LT-800LR-400/500
Select Battery Type
3
Two types of batteries may be used: The unit is shipped with the switch in the Alkaline position.
Use a pen or small screwdriver to select the battery type.
Battery select switch
WARNING: Do not place the BATTERY switch in the NiMH position if you are not using
Nickel Metal Hydride Batteries. The NiMH position will attempt to charge
any batteries in the unit, even if they are not the proper type. Charging
non-Nickel Metal Hydride (NiMH) batteries will result in physical harm,
destruction of property and/or fi re.
CAUTION: If you are using any battery type other than rechargeable Nickel Metal
Hydride (NiMH) batteries, make sure the BATTERY selection switch is in the
alkaline position.
50
Page 57
LR-400/500 Setup Instructions
Place Batteries in Unit
4
Place two AA batteries in the compartment, making note of the battery polarity shown in the battery
compartment, and again verifying that the BATTERY SELECT switch is in the correct position for the
batteries you are using. (Alkaline should be selected for all battery types other than NiMH).
NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high
performance AA Nickel Metal Hydride batteries (part number LA-362). These may be
purchased from your Listen dealer.
-
-
+
+
+
+
-
-
5
Connect an Earphone or Headset
Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo
connectors may be used with a Listen receiver. Make certain you push the plug all the way into
the jack.
LR-400/500
51
Page 58
LR-400/500 Setup Instructions
6
Turn the Unit On
Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of the unit will
illuminate and the LCD display should illuminate. If they do not, make sure you have installed the batteries correctly and that you are using fully charged batteries.
LT-800LR-400/500
52
Page 59
LR-400/500 Operating Instructions
1
Turn Unit On
1A
Volume knob
Rotate the volume knob counterclockwise with an earphone or headset connected to
the unit.
WARNING: Excessive volume may result in hearing damage.
Antenna Placement
2
2A
Antenna Position
Raise the antenna to the upright position. When the antenna if fully extended, it will
click into position.
NOTE: Be aware that the transmission range could decrease if the antenna is
not in an upright position.
3
Select a Channel
3A
Select the channel using channel select buttons
Select the channel to match the transmission channel by pressing the UP and DOWN
buttons on the receiver.
LR-400/500
53
Page 60
LR-400/500 Operating Instructions
Select the channel using SEEK
3A
Another way to fi nd a channel on the LR-400/500 is to use the SEEK button.
When you do this, the Listen receiver looks for the next active channel.
Sometimes the unit will mistake interference for a real broadcast signal. If you
get interference, press the SEEK button again. The unit may stop on a
channel that is close to the actual broadcast channel, in which case the
channel will sound noisy or distorted. Simply press SEEK again until you fi nd the
clearest operating channel.
LT-800LR-400/500
4
Adjust the volume control
Use the control dial on the top of the unit to adjust the volume to a comfortable level.
54
Page 61
LR-400/500 Operating Instructions
Locking the Receiver on One Channel
The unit can be electronically locked on one channel so that it will not change channels even if the “SEEK” button is
pressed. It is recommended to lock the receiver on a channel that is being used in a single channel system or when multiple systems are in the same area.
1
To lock on a channel
1A
Press and hold the SEEK button for 5 seconds
Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned
channel. Press and hold the button again to unlock. When locked the LED on top of
the unit will fl ash when you press the SEEK button.
NOTE: On the LR-400/500, when the channel is locked, a lock icon will appear underneath
“Listen” on the display. Also if the unit is locked, the red LED on top of the receiver will fl ash
when the SEEK button is pressed.
LR-400/500
55
Page 62
LR-400/500 Operating Instructions
Squelch Programming
Entering Squelch Program Mode
1
Turn unit off
Press and hold the SEEK button; while holding SEEK button down, turn the ON/OFF/VOLUME dial to turn
2
the unit on.
3
Release the SEEK button when the Listen name disappears (approximately 2 seconds) and a two digit
display is seen.
Adjusting the Squelch level
Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings (refer to the chart on
1
page 49 for settings.
Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you can have a
2
longer range before the unit will squelch.
Once the desired squelch setting is found, press SEEK to exit the squelch programming mode.
3
LT-800LR-400/500
NOTE: Keep in mind, low squelch may allow multipath and squelch chattering at long distances.
Squelch setting 00 is no squelch; this setting disables the squelching capabilities of the receiver. Squelch
setting 20 is maximum squelch sensitivity; when on this setting, there must be a very strong and stable
RF signal for the unit to not engage the squelch feature.
NOTE: For squelch settings 1-3, the squelch function is slow which allows for maximum
transmission range. For squelch settings 4-20 the squelch function is fast to ensure little
radio noise is heard during the squelch function.
56
Page 63
LR-400/500 Operating Instructions
Squelch
The purpose of squelch is to mute the audio output of your receiver when the signal from the
transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise
in your earphone. The squelch on your receiver can be adjusted so that it will mute the audio on
different RF signal strengths. This is useful as follows:
Set the squelch setting to the highest level
To ensure that users don’t hear transmissions from other
transmitters, set the squelch setting to the highest level that
doesn’t squelch the receiver.
If the receiver is close to the transmitter, set the squelch high
If the receiver is going to be close to the transmitter (i.e. in
a classroom), set the squelch setting high so that when the
transmitter is turned off it immediately squelches and ignores
transmitters in other rooms.
Squelch
Setting
0
1
2
3
(default)
4
5
6
Squelch
No Squelch
Loose Squelch
(Most Range)
If in an area that has a lot of interference, set the squelch high
If you are in an area that has a lot of inference, you may want to
set the squelch setting to a high setting to ensure the
interference is not picked up by the receiver.
For maximum amount of range, set the squelch to a low level
If you need the maximum amount of range, you may want to
consider setting the squelch setting to a low level (0, 1 or 2).
NOTE: Default squelch setting is 3
CAUTION: When setting the squelch level low the reliability of squelch
function is compromised. This will cause radio noise to be heard in
the earphone and there is a possibility of hearing damage.
10
11
12
13
14
15
16
17
18
7
8
9
LR-400/500
(Least Range)
Tight Squelch
19
20
57
Page 64
LR-400/500 Operating Instructions
DX/Local
DX is the normal operational mode. Local mode can effectively limit any inter-modulation and/or
interference in a busy RF environment. This is done by limiting the amount of RF gain in the receiver.
When local mode is selected, the range of the receiver is compromised. Depending on your application
and environment, Local mode may be necessary for better performance. DX mode is default.
DX Mode (default)
DX is normal operation. The local mode feature can be used
when many frequencies are being used.
Local mode
Only strong channels will be automatically tuned in
1
To change to DX/Local mode
1A
While the unit is OFF, press and hold the channel down button and turn the unit on.
The LCD shall indicate the current setting “D” or “L”.
1B
Pressing the down button will toggle between Local and DX Mode; “D” or “L”.
1C
1D
Pressing seek will enter the setting and return to normal operational mode.
LT-800LR-400/500
Resetting to defaults
To reset the receiver to default settings, follow these instructions:
Reset to default settings
1
1A
Press and hold the Up and Down channel buttons while turning the unit on.
Press and hold the Up and Down channel buttons while turning the unit on. This will light
up all segments of the display.
1B
After the receiver has been reset
After the receiver has been reset, the display will return with defaults present.
NOTE: The defaults are
• Channel: 01
* Channel lockout: All channels active
LocalDX
58
Page 65
LR-500 Programming Instructions (LR-500 only)
Programming Instructions
The LR-500 can be programmed to receive on a limited number of channels. When an
application requires the use of more than one channel (i.e. a classroom or language
interpretation), the receiver can be programmed to view only the necessary channels.
Entering Program Mode
To enter program mode
1
While the unit is ON, press and hold the channel down and up buttons simultaneously for 3 seconds.
1A
The “PGM” icon on the LCD will appear indicating program mode is active.
1B
2
To program
2A
Once in the program mode, a function menu is displayed. Function 1 (F1) is displayed as default.
Pressing the channel up or down buttons will scroll through the functions (F1).
Pressing the seek button will enter that particular function.
F1- Channel Lock out. No channels are locked out as default. Pressing the up and down buttons will scroll through
channels. Pressing the seek button will toggle between available and locked out for that channel. When a channel is locked out, the L/O on the LCD shall be displayed.
NOTE: Although it is possible to display an F2 function while in program mode, there is no F2 function at this
time. Listen may add another programming function in the future, but there is only one programming
function (F1) on the 863 MHz receivers.
When no button is pressed for 10 seconds, the program menu is exited altogether, regardless of whether a
3
function is entered or not. To exit out of the program menu or function manually:
3A
When in the programming menu: Press and hold power for 2 seconds. This exits the program mode.
3B
When in a programming function: Press and hold power for 2 seconds. This exits the function and goes back to
the programming menu.
Pressing and holding power for a full 4 seconds will exit both programming function and programming menu.
3C
LR-400/500
59
Page 66
Accessories for LR-400/500
Accessories
LT-800LR-400/500
LA-164
Ear Speaker
LA-170
Behind-the-Head
Stereo Headphones
LA-165
Stereo Headphones
(01)
(02)
(03)
LA-208
7.5 VDC Power/Charging
Supply for FM Portable Products
LA-208-01 North America
LA-208-02 Asia/UK
LA-208-03 Euro
LA-166
Neck Loop
LA-304
Assistive Listening
Notifi cation Signage Kit
LA-311 16-Unit Portable Charging/Carrying Case
LA-313 16-Unit Portable Carrying Case
LA-317 4-Unit Portable Charging/Carrying Case
LA-318 4-Unit Portable Carrying Case
LA-320 Confi gurable Carrying Case
LA-321 8-Unit Portable Charging/Carrying Case
LA-322 8-Unit Portable Carrying Case
LA-323 4-Unit Portable Charging/Carrying Case w/Removable Lid
LA-324 8-Unit Portable Charging/Carrying Case w/Removable Lid
LA-325 16-Unit Portable Charging/Carrying Case w/Removable Lid
60
LA-361
High Capacity AA Alkaline
Batteries (2)
LA-362
Rechargeable AA NiMH
Batteries (2)
Page 67
Notes
LR-400/500
61
Page 68
Notes
LT-800LR-400/500
62
Page 69
Page 70
Page 71
Page 72
Page 73
Supplementary Information Table of Contents
Battery Charging Information 69
Frequency Chart 70
Troubleshooting 71
Frequently Asked Questions 73
Compliance, Warranty and Contact Information 75
Notes 76
Supplementary
67
Page 74
Page 75
Battery Charging Information
The Listen receivers are unique because they have SmartCharge™ chargers built in. When any of these units are connected to an LA-208
wall transformer or dropped into a Listen charging case, NiMH batteries will be charged.
SmartCharge™ uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH) batteries. The entire charging process
takes about 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life.
During the charge cycle, the red LED on top of the Listen product will fl ash slowly. When charging is completed, the LED will turn off. It is not
necessary to unplug the charger; however, if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge
cycle over again. (show top of a receiver [LED])
When not using the receiver, it is recommended to leave the unit on the charger. The charger provides a “maintenance”
charge that keeps the battery at 100%. If the unit is not on the charger, the battery will lose up to 20% of its charge per month.
NOTE: Listen provides 2300 mAH (milli-Amp-hour) constant current NiMH Nickel Metal Hydride) batteries. These
may be purchased from Listen (part number LA-362).
Charging with the LA-208
To charge the batteries using the LA-208 wall transformer, plug the transformer into the
jack marked “PWR/CHG” on the side of the unit. The unit can be operated while the
batteries are charging.
Charging with a drop-in charger
To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and connect
the charger to power. Make sure the unit is fully seated in its slot.
IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL METAL HYDRIDE) with
your Listen equipment. Alkaline batteries may explode when connected to a charger. Other risks of
charging non-NiMH batteries include destruction of property or fi re.
IMPORTANT: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be set to the
NiMH setting. Use a pen or small screwdriver to move the switch (located in the battery compartment)
to the proper position.
Supplementary
WARNING: The case lid MUST be open or removed while the units are charging. The charging process generates
heat. Air ventilation is required. It is best to store your charging case at room temperature away from
heat sources and direct sunlight
69
Page 76
Frequency Chart
Frequencies
LT-800Supplementary
70
Page 77
Troubleshooting
Troubleshooting
The LT-800 has no power.
Make sure the 12 VDC 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.
1. 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 defl ect 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.
2. 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 (page 33 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.
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 .
I cannot pick up the signal on the receiver.
Check to make sure the receiver and the transmitter are on the same channel. Make sure the LT-800
has an antenna connected. Ensure that the receiver has the antenna pointed upward.
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. To
Lock receiver on a channel, hold the seek for 3 seconds
There is not suffi cient 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
[LA-130 Remote Antenna Kit (863 MHz)] that can be mounted on a mast or wall. Try using different
frequencies to fi nd one with less interference. (please refer to design guide)
Supplementary
71
Page 78
Troubleshooting
Troubleshooting
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 fi nd a clear channel. Please contact Listen for more ideas on
troubleshooting the interference.
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.
Can I use another manfactures receivers with the LT-800-863.
Listen’s 863 MHz equipment is not compatible with any other 863 MHz equipment.
Several transmitters are operating in the same environment.
For this, you’ll need to choose your transmitting frequencies carefully. See pages 15-16 for more
details.
Can I have two antenna’s 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.
LT-800Supplementary
72
Page 79
Frequently Asked Questions
Frequently Asked Questions
Does the LT-800 include the rack mount?
Q
Q
Q
Q
No, but the LA-326 Universal Rack Mount Kit may be ordered to compliment the LT-800.
A
Do I need a transmitter for each audio source?
No, Each Transmitter can mix two different input sources.
A
What is the range of the LT-800-863 Transmitter?
Line of site 122 m (400 ft).
A
How many transmitters can be placed in one room?
Up to eight can be used simultaneously.
A
Can the LR-500 be used with multiple transmitters?
Q
Q
Q
Q
Yes. We recommend the LR-500 for use with multiple transmitters. The LR-500 is programmable and
A
can be set to just those channels you need.
How many channels can I program into the LR-500?
1 to 17. The receiver has 17 channels and you can program it to have just the channels you want
A
to have access to. It can be a two channel receiver, a 12 channel receiver, or keep all 17.
How many receivers can I have in a system?
As many as you need, the number is endless.
A
What is the difference between the LR-400 and the LR-500?
Both receivers can tune to 17 broadband channels. However the LR-400 has the buttons to
A
make changes under the battery compartment door and the LR-400 is not programmable to
lock out channels. If you plan to use one receiver with multiple transmitters you should use the
LR-500 which is programmable to just those channels you need.
Supplementary
73
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Frequently Asked Questions
Frequently Asked Questions
Can the receiver be “locked” on a channel if I need that?
Q
Yes. All Listen receivers can be locked.
A
What is the battery life of a receiver?
Q
20 hours using alkaline batteries. 10 hours using NiMH batteries.
A
LT-800Supplementary
74
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Compliance, Warranty and Contact Information
Compliance Information
The following compliance information applies to the LT-800-863, LT-700-863, LR-500-863 and LR-400-863
These devices comply with ETSI EN 301 357
These devices are CE compliant.
These devices are RoHS compliant.
Warranty
Listen Technologies Corporation (Listen) warrants its transmitters and receivers (models LT-700, LT-800, LR-42, LR-44,
LR-100, LR-300, LR-400, LR-500 and 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 it’s 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.
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, or online warranty registration, has been completed 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.
Warranty does not include inbound freight costs. 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.
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.
All Listen European markets are supported through the Listen Technologies GmbH offi ce located in Oberasbach, Germany. For
more information on Listen solutions, contact Listen Technologies at +1.801.233.8992, +1.800.330.0891 North America,
Listen Technologies GmbH at +49 911 955159-0 or visit www.listentech.com. For Europe, Middle East, Africa and India offi ce visit
www.listentech.de.
14912 Heritagecrest way
Salt Lake City, Utah U.S.A. 84065-4818
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995
support@listentech.com
www.listentech.com
North America
Fax
Listen Technologies GmbH
Jasminstr.16, 90522 Oberasbach, Germany
+49 911 955 159 0
+49 911 955 159 40
support@listentech.de
www.listentech.de
Europe
Fax
Supplementary
75
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Notes
LT-800Supplementary
76
Page 83
Page 84
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
info@listentech.com
Listen Technologies GmbH
Jasminstr. 16
905 22 Oberasbach, Germany
+49 911 955159 0
+49 911 955159 40
EMEAI
Fax
www.listentech.de
info@listentech.de
Printed in the United States of America
© 2007 Listen Technologies Corporation
®
All Rights Reserved 20071015
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