Listen lt-800 User manual

User’s Manual
LT-800 Stationary Transmitter
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: [phone]
Toll Free (North America): 1.800.330.0891
Fax: [phone]
E-mail: [e-mail]
Don’t miss a single sound. Listen.
Listen®and the Listen logo are registered trademarks of Listen Technologies Corporation

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 prob-
lems with your Listen products, we are ready to help you in any way we can.
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:
Telephone: [phone]
Fax: [phone]
Toll Free (North America): 1.800.330.0891
E-Mail: [e-mail]
Web: www.ListenTech.com
Thank you... and enjoy your listening experience!
Best regards,
The Listen Team
iListen™ and the Listen Logo are registered trademarks of Listen Technologies Corporation.
LT-800_2004_01_18 © 2004 Listen Technologies Corporation. All Rights Reserved.
· LT-800 Stationary Transmitter (72MHz or 216MHz)
· LA-201 120 VAC Power Supply
· LA-121 BNC Adapter (72MHz model only)
· Warranty Card
· User Manual
LT-800 Package Contents
72 MHz: LT-800-072
216 MHz: LT-800-216
Listen Part Number
See page 18
Optional Accessories

Table of Contents
Architectural Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Audio Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Listen SQ™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
RF Reception Maximization Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Coaxial Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
72 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
216 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Compliance Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Table of Contents

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 63Hz to 15KHz, ± 3dB at 72MHz, or of 63Hz to 10kHz, ± 3dB at
216MHz. It shall have two mixing audio inputs. The device shall have the following audio controls: input
level, mix level and an adjustable low pass shelving filter. The Listen LT-800 is specified.
Specifications
2
Specifications
Specification LT-800-072 LT-800-216
RF Frequency Range 72.025 - 75.975 MHz 216.025 - 216.987 MHz
Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
Frequency Accuracy
Transmitter Stability
Transmitter Range 1,500 ft (457.2m) 3,000 ft (914.4m)
Output Power 8,000uV at 3m 100mW (Max allowed by FCC)
Antenna
Antenna Connector Reverse BNC BNC
Compliance
System Frequency Response 63Hz - 15kHz (±3dB) 63Hz - 10kHz (±3dB)
System Signal to Noise Ratio
(A-weighted)
SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB
System Distortion
Audio Input 1
Audio Input 2
Combined Audio Output (Mix)
Headphone Output
RF Power Selection
Set-up Controls
User Controls
Programming
Input VU Meter
Mix VU Meter
RF Power
Power
LCD Display
Test Tone
Power Supply Type
Power Supply Input
Power Supply Output
Power Supply Connector
Compliance
Dimensions
Unit Weight
Unit Weight
with LA-201 Power Supply
Shipping Weight
Rack Mounting
Temperature - Operation
Temperature - Storage
Humidity
<2% total harmonic distortion (THD) at 80% deviation
Red LED illuminates when test tone enabled
Ten step LED (eight green, two red)
FCC Part 15, Industry Canada
Rear panel. Full, ½, ¼ (see "Output Power" above).
Rear panel. Female–XLR and ¼ in combo connector, balanced, -55/0dBu
(mic/line) nominal input level adjustable, -30/+21dBu (mic/line) maximum,
impedance 1k/20k Ohms (line/mic)
Rear panel. One Phono connector, unbalanced, -10/+10dBu (line/speaker)
nominal input level adjustable, +30dBu maximum, impedance 100k Ohms
Front Panel. Input level, mix level (modulation), contour equalization
Channel selection can be locked by holding the
UP and DOWN button 5 seconds.
0 to 95% relative humidity, non-condensing
3.0 lbs (1.4kg)
5.0 lbs (2.3 kg)
½ rack unit (RU)
4.4 lbs (2.0kg)
-20° to +50°C (-4° to 122° F)
-10° to +40°C (14° to 104°F)
8.0 in x 8.0 in x 1.75 in WxDxH (20.3cm x 20.cm x 4.45cm)
** All system specifications are wireless end-to-end
± .005% stability 0° to 50°C (32° to 122° F)
RF power, test tone, channel UP and DOWN,
Input 1: line or mic level, Input 2: speaker or line level.
50 PPM
Several available. See www.ListenTech.com for details
Rear panel. One Phono connector, unbalanced, 0dBu nominal output level,
+19dBu maximum, impedance 10 Ohms.
Front panel. One 3.5mm connector, unbalanced, adjustable output level,
+14dBu 250mW, maximum, impedance 32 Ohms.
Four step green LED
UL Listed
15VAC, 1A
Dual Ten step LED (eight green, two red)
Green LED illuminates when the unit is powered up
Channel and lock status
.02 in OD x .01in ID (5.0mm x 2.5mm), barrel type
Physical
Environmental
RF
Audio
Indicators
Controls
Power
In-line power supply, Listen part number LA-201
120VAC, 60 Hz, 19 watts (maximum continuous)

Volume
MONITOR
MIX
OUTPUT
Phono
3.5mm
Stereo
Input 2 Level Select
Line, Speaker
Speaker, +10dBu
Phono
INPUT 2
Line, -10dBu
Female XLR-¼"
Combo Connector
2/Tip
3/Ring
1/Sleeve
INPUT 1
Input 2
Input 1 Level Select
Line, Mic
Mic
400Hz
Line
12VDC
On/Off
TEST TONE
Red LED
Listen LED Display
Input 1 VU Meter
Input 2 VU
Meter
CONTOUR
Front
Panel
Pan Pot
MIX LEVEL
SQ
On Off
SQ
SQ Switch is internal
(diagonal left and front of Antenna Stud)
VU Meter
Pre-emphasis
Transmitter RF
Board
Hi Mid
Low
RF POWER
ANTENNA
BNC
Remote Antenna
(Antenna not provided)
Top Mounted Antenna Stud
(Antenna not provided)
15VAC, 1A
115VAC
60Hz
In-Line
Power Supply
LA-201
(provided)
POWER
Red LED On Off
CHANNEL
Power Supply
CPU Module
Up
Down
Block Diagram
3
LT-800 Block Diagram

Quick Reference
4
Quick Reference
LT-800 Front Panel: Controls & Displays
Adjust audio input levels of
INPUT 1 and INPUT 2 here.
See page 6 for more
information.
Indicates audio input
level of INPUT 1 and
INPUT 2 Shows MIX
Audio level
Indicates RF
output power (full,
½ or ¼) - select
on rear panel (see
below)
Shows which
channel is
selected
If decimal is lit,
channel is locked
Plug in a head-
set and adjust
volume
CHANNEL SELECT
TO LOCK CHANNEL: press
UP and DOWN buttons
simultaneously and hold
for 5 seconds. Press both
and hold again to unlock.
CONTOUR: Equalization adjust-
ment. Turn counter-clockwise for
voice and clockwise for music
MIX LEVEL: Adjust so the
Mix Level meter occasionally
lights the RED LED
TEST TONE: Activates a
tone to aid system setup
(cannot be heard on
monitor jack)
Power
ON / OFF
LT-800 Back Panel: Connections and Settings
The Listen LA-201
power supply
connects here.
Set RF Power level here (¼, ½ and
Full). See page 5 for guidelines on
setting power levels.
INPUT 2: This unbalanced
phono connector is used to
connect an unbalanced high
impedance line or speaker
input.
Set switch to match your
INPUT 2 source. The level in
the LINE position is -10dBu
and in the SPEAKER posi-
tion, it is +10dBu.
INPUT 1: Used for balanced
connection of a microphone or
line level input. This combina-
tion connector accepts either
XLR or ¼” phone plugs.
Select MIC or LINE input here for
INPUT 1. Mic input level is -55dBu,
in the LINE position, the input level
is +4dBu.
AUDIO OUTPUT: This
connector contains a mix of
INPUT 1 and INPUT 2. This is an
unbalanced phono connector;
the output level is -10dBu.
REMOTE ANTENNA
CONNECTION: See the Listen
website for details on antennas
that can be attached here.
Top antenna connection: Remove
rubber plug and screw antenna in
place.

Setup
5
Remove the product
Remove outer packaging and plastic cover. Inspect for
physical damage.
Set SQ Switch
The SQ switch comes in the ON position. This is the
recommended position. Make sure receivers you are
using have SQ on as well (factory default). See page 8
for an explanation of SQ. Remove the rubber plug
from the top of the unit. In a good light, locate the SQ
switch through the antenna opening in the top of the
unit. The switch is located next to the antenna
connector inside the unit. Move the switch toward the
front of the unit to enable SQ; move the switch
toward the back of unit to disable SQ.
For rack mounting
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 supply to unit
Plug the power supply into the power connector on
the back panel. Do not connect to AC power yet.
(Only use a Listen approved power supply. The
LA-201, an in-line transformer, is the approved power
supply for this unit.)
Connect antenna
Connect the antenna (not included)
according to the installation
instructions. Only use an antenna
supplied by Listen. If you are connecting
the antenna directly to the top of the
LT-800, you will need to remove the
rubber plug on top of the unit. If you are
using a remote antenna connected to
the rear of the unit, do not connect an
antenna to the top connector. See page
18 for antenna options, or refer to the
Listen website for
remote antenna
options.
Set the RF power
Set the RF POWER switch for FULL, ½ or ¼. (Level
is indicated on the front panel.) The amount of
transmitted RF power that you will need depends on
your application. If you are operating other
transmitters in the same environment and receivers
may be used close to the
antenna, it is best to have the
transmitter’s output power at
its lowest level to reduce the
possibility of interference.
LT-800 Setup Instructions
Note: If you will be using your LT-800 with receivers that do not have SQ
capability, disable the SQ feature.
Rack Mount with dual unit installed
Shown with LR-100 and LT-800
Rack Mount with single unit installed
Shown with LT-800
LT-800 with top mount LA-102-072MHz, LA-106-216MHz
Telescoping Antenna connected through top of unit.
LA-122 Remote Antenna
See RF Reception Maximization Strategies and
Coaxial Cable on pages 10 and 11.
Rear of LT-800 unit

LT-800 Setup Instructions
Setup / Audio Control
6
Power up
a. Connect the LA-201 power supply to AC power.
b. Press the POWER button on the front panel.
c. Select the desired channel using the UP and
DOWN buttons.
d. If desired, lock in the selected channel by pressing
the UP and DOWN buttons simultaneously and
holding for 5 seconds.
Connect Audio Inputs
Connect audio source(s) to one or both audio input
connections. Input 1 offers a choice of balanced XLR
or ¼” phono connection. Input 2 is an unbalanced
phono connector.
Connect balanced and unbalanced audio
sources
Make sure that if you are connecting an unbalanced
audio source to input 1 that pin 3 of the XLR or the
ring of the ¼” phone plug are connected to ground as
shown.
Adjust audio input switches
With Input 1 Switch, select MIC or LINE input level;
for Input 2 Switch, select LINE (-10dBu) or speaker
(+10dBu) level. (See illustration on page 4.)
Use the headset jack to listen to audio source: With
the audio source or sources active and the unit pow-
ered ON, plug a headset into the 3.5mm jack located
on the LT-800’s front panel to listen to the audio
source. Adjust headset volume to a comfortable level.
Input levels can be viewed on the two VU meters on
the front panel.
LT-800 Audio Control
Adjust input
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 audio level so that the first VU meter does
NOT peak in the red.
Adjust Contour
Adjust the CONTOUR knob counterclockwise if your
audio source is mostly voice. Adjust the knob clock-
wise if your audio source is mostly music. The CON-
TOUR knob adjusts the relative equalization of the
unit. This equalization boosts or cuts frequencies
above 5kHz.
Adjust Mix Level
Adjust the mix level knob so that the audio level on
the right VU meter occasionally peaks red. (This is
the level adjustment for the combined output from
Input 1 and Input 2.)
Rear of LT-800 with XLR connected to Input 1
Press POWER button and verify power connections.
When “ON”, channel display LED will be lit.
123
- +
XLR Wiring ¼” Phone Wiring

Operation / Transmission
7
Operating the LT-800
Power unit on
Select a channel
Select the transmit channel by pressing the channel
UP and DOWN buttons. See Channel Selection on
page 9 for more information.
Can’t change the channel? It may be locked. Press
and hold both the UP and DOWN buttons simultane-
ously for 5 seconds until the decimal dot next to the
channel turns off. Press again to lock in a new chan-
nel, if desired.
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. This tone is not heard from the monitor
jack.
Compatibility with other manufacturers
If you are using another manufacturers’ receivers with
the LT-800, determine their frequency then refer to
Listen’s Frequency Compatibility Tables (pages 12-13)
to find the LT-800 channel that corresponds with the
receiver’s frequency. As much as possible, Listen has
duplicated the wide band channel letters to cover fre-
quencies of other major brands. However, we recom-
mend verifying corresponding channel numbers and
letters on the tables on pages 12-13.
UP and DOWN buttons
LT-800 Transmission

Listen SQ™
8
We 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 reduce noise of our systems, 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 should disable Listen SQ.
Your Listen equipment 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 system with older version Listen equipment that
does not have the SQ function.
2. You are using your new Listen system with equipment supplied by other manu-
facturers.
3. You expect that end users may bring and use their own receivers that don’t
have the SQ function.
Listen SQ™- Improving Your Listening Experience
SQ Summary
· Improves noise perform-
ance by at least 20dB
· SQ is NOT compatible
with older version Listen
products
· SQ is NOT compatible
with other manufacturers’
products
· SQ is NOT squelch
· To work properly, SQ
must be enabled for both
the transmitter and
receivers
· SQ can be disabled to per-
mit operation with older
Listen products or other
manufacturers’ products

Channel Selection
9
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 (lettered channels at 72MHz
and channels that start with a “2” for 216MHz when using a Listen receiver).
Listen to the audio through the headphone or via the speaker. Choose a channel
with the least amount of interface. Unless you are interfacing with an existing nar-
rowband transmission system, always use a wide band channel. If you are using
multiple channels follow this process:
a. Same Space If you are using multiple transmitters in the same space, the
most number of channels that will work simultaneously is six at 72MHz and
three at 216MHz. With all of the transmitters off, listen for interference on all
the wide band channels via the headphone jack on a Listen receiver. Using the
frequency 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 300KHz.
If there is no interference the following channels are recommended: A, C, E, I, J,
and H for 72MHz and channels 2A, 2K and 2V at 216MHz.
b. Distributed Spacing If you are using transmitters that are spread out over
space, you can achieve more simultaneous broadcast channels. However, it is
critical that your receiver(s) be located as close to its transmitter as possible.
You can use adjacent channels (see frequency compatibility tables on pages 12-
13) in this case as long as the adjacent channel transmitter is at least 50% fur-
ther away from the receiver as its transmitter. Example: The transmitter for the
receiver on channel E is 100 feet from the receiver. The adjacent channel trans-
mitter on channel D should be at least 150 feet away.
It is highly recommended that after channel selection has been achieved, you lock
the channel so that it cannot be changed by the user. To accomplish LOCK on the
LT-800, press both the UP and DOWN buttons simultaneously for 5 seconds.
Repeat the process to unlock.
Notes in regard to using 72MHz and 216MHz systems:
i. 72MHz in 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.
ii. 216MHz 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 216MHz band due to
channel 13, it is recommended that you switch to a 72MHz system.
Channel Selection
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 manufactur-
ers. Wide band channels have lower
noise than their narrow band counter-
parts.
At 72MHz
The LT-800 at 72MHz 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 216MHz 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)

RF Reception Strategies
10
For proper and dependable operation, Listen receivers should receive a strong and
consistent signal from the originating transmitter. The following strategies should
be used maximize this signal:
a. When designing and installing your system, keep in mind that the location of
both the transmitting and receiving antennas is critical to maximizing signal
strength.
b. Eliminate or minimize obstructions between the transmitting antenna and the
receiving antenna.
c. Minimize the distance between the transmitting and receiving antennas.
d. Move transmitting and receiving antennas away from metal objects.
e. Place the transmitting antenna as high as possible.
f. Orient both transmitting and receiving antennas vertically.
CAUTION: When installing antennas, ensure the antenna is clear of power lines.
NOTE: If the RF signal to the 216MHz model receivers is too high, the audio will
be distorted. This may happen if you are within 40 feet of the 216MHz transmitter.
Coaxial cable, connectors, and optional antenna mounting kits are available from
Listen. Visit www.ListenTech.com or ask your dealer for details.
RF Reception Maximization Strategies

Coaxial Cable
11
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 loca-
tion than on 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
won’t work with your Listen system.
If you need to run cable over a greater length than 50 feet for 216MHz applications
or greater than 100 feet for 72MHz applications, we recommend that you use RG-8
cable rather than RG-58. It 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 “loss” characteristics of the
cable. At 72MHz, there is an average loss of 2dB per 100 feet of cable and at
216MHz an average* loss of 5 dB per 100 feet of cable. (A 3dB loss means half of
your power has been lost.) However, it is better to suffer coaxial power loss than to
try to shoot your signal through obstacles! Obstacles, especially metal, can create
drop-outs or reflections of your signal that will result in poor listening conditions.
*NOTE: There are many varieties of 50 Ohm, RG58 and RG8 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.
Coaxial Cable

72MHz Compatibility Chart
12
72MHz Compatibility Chart
72.6000 OOOOO,(24)12F72.6
72.6250 13 13 13 O2 (26, 25)
72.6500 (26) 13
72.6750 14 14 14 4 (27)
72.7000 DDDDD,(28)14G72.7
72.7250 15 15 15 D5 (29)
72.7500 (30) 15
72.7750 16 16 16 D6 (30, 31)
72.8000 PPPPP,(32)16H72.8
72.8250 17 17 17 P7 (31, 33)
72.8500 (34) 17
72.8750 18 18 18 P8 (32, 35)
72.9000 EEEEE,(33,36)18I72.9
72.9250 19 19 19 E9 (34, 37)
72.9500 (38) 19
72.9750 20 20 20 E0 (35, 39)
74.6250 33 33 33 E3 (36, 40)
74.6500 (41) 20
74.6750 34 34 34 E4 (37, 42)
74.7000 IIIII,(38,43)21O
74.7250 35 35 35 I5 (39, 44)
74.7500 (45) 22
74.7750 36 36 36 I6 (40, 46)
75.2250 37 37 37 I7 (41, 47)
75.2500 (48) 23
75.2750 38 38 38 I8 (42, 49)
75.3000 JJJJJ,(43,50)24P
75.3250 39 39 39 J9 (55, 51)
75.3500 (52) 25
75.3750 40 40 40 J0 (45, 53)
75.4000 RRRRR,(54)26Q
75.4250 21 21 21 R1 (46, 55)
75.4500 (56) 27
75.4750 22 22 22 R2 (47, 57)
75.5000 FFFFF,(48,58)28J75.5
75.5250 23 23 23 F3 (49, 59)
75.5500 (60) 29
75.5750 24 24 24 F4 (50, 61)
75.6000 SSSSS,(62)30K75.6
75.6250 25 25 25 S5 (51, 63)
75.6500 (64) 31
75.6750 26 26 26 S6 (52, 65)
75.7000 GGGGG,(53,66)32L75.7
75.7250 27 27 27 G7 (54, 67)
75.7500 (68) 33
75.7750 28 28 28 G8 (55, 69)
75.8000 TTTTT,(70)34M75.8
75.8250 29 29 29 T9 (56, 71)
75.8500 (72) 35
75.8750 30 30 30 T0 (57, 73)
75.9000 HHHHH,(58,74)36N75.9
75.9250 31 31 31 H1 (59, 75)
75.9500 (76) 37
75.9750 32 32 32 H2 (60, 77)
*Parenthesis indicate T35 and T20 narrowband.
NOTE: Wideband frequencies in highlighted rows.
Frequency
MHz
Listen
Phonic
Ear
Comtek Phonak Williams* Gentner Telex Drake
72.0250 1 1 1 A1 (11, 1)
72.0500 (2) 1
72.0750 2 2 2 A2 (12, 3)
72.1000 AAAAA,(13,4)2A72.1
72.1250 3 3 3 A3 (14, 5)
72.1500 (6) 3
72.1750 4 4 4 A4 (15, 7)
72.2000 KKKKK,(8)4B72.2
72.2250 5 5 5 K5 (16, 9)
72.2500 (10) 5
72.2750 6 6 6 K6 (17, 11)
72.3000 BBBBB,(18,12)6C72.3
72.3250 7 7 7 B7 (19, 13)
72.3500 (14) 7
72.3750 8 8 8 B8 (20, 15)
72.4000 NNNNN,(16)8D72.4
72.4250 9 9 9 N9 (21, 17)
72.4500 (18) 9
72.4750 10 10 10 N0 (22, 19)
72.5000 CCCCC,(23,20)10E72.5
72.5250 11 11 11 C1 (24, 21)
72.5500 (22) 11
72.5750 12 12 12 C2 (25, 33)

216MHz Compatibility Chart
13
216MHz Compatibility Chart
Frequency
MHz
Listen
Phonic
Ear
Comtek Phonak Williams Gentner CSI AVR
Light
Speed
216.0125 1A 1 1 C01 N01
216.0250 2A 41 41 41 1 1
216.0375 3A 2 2
216.0625 1B 3 21
216.0750 2B 42 42 42 2 10
216.0875 3B 4 4
216.1125 1C 5 5 C05
216.1250 2C 43 43 43 A 3 6
216.1375 3C 6 22
216.1625 1D 7 23
216.1750 2D 44 44 44 B 4 14
216.1875 3D 8 8
216.2125 1E 9 9 C09 N09
216.2250 2E 45 45 45 C 5 2
216.2375 3E 10 24
216.2625 1F 11 25
216.2750 2F 46 46 46 D 6 11
216.2875 3F 12 12 C12 N12
216.3125 1G 13 13
216.3250 2G 47 47 47 E 7 7
216.3375 3G 14 26
216.3625 1H 15 27
216.3750 2H 48 48 48 F 8 15
216.3875 3H 16 16 C18 N18
NOTE: Wideband frequencies in highlighted rows.
216.4125 1J 17 17 C21
216.4250 2J 49 49 49 G 9 18
216.4375 3J 18 18
216.5125 1K 21 61
216.5250 2K 51 51 29 H 10 3
216.5375 3K 22 62
216.5625 1L 23 28
216.5750 2L 52 52 52 I 11 12
216.5875 3L 24 64 C24 N64
216.6125 1M 25 65 C25
216.6250 2M 53 53 53 J 12 8
216.6375 3M 26 81
216.6625 1N 27 82
216.6750 2N 54 54 54 K 13 16
216.6875 3N 28 68
216.7125 1P 29 69 C29
216.7250 2P 55 55 55 L 14 19
216.7375 3P 30 83
216.7625 1R 31 84
216.7750 2R 56 56 56 15 4
216.7875 3R 32 72 C32 N72
216.8125 1S 33 73 C33
216.8250 2S 57 57 57 13
216.8375 3S 34 76
216.8625 1T 35 85
216.8750 2T 58 58 58 9
216.8875 3T 36 86
216.9125 1U 37 77 C37 N77
216.9250 2U 59 59 59 17
216.9375 3U 38 88
216.9625 1V 39 79 C39
216.9750 2V 60 60 60 5
216.9875 3V 40 80 C40 N80

Troubleshooting
14
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.
There is no audio or the audio level is too low
Make sure that you have an audio source 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 Line position. If it were to be in the
Speaker 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.
Try connecting a headset to the front panel jack and adjusting the Monitor vol-
ume control so that you can listen to the audio source.
The audio is distorted
Check to make sure you have the input level select switches in the proper posi-
tion. You may be providing too much audio level for the input stage to handle.
Make sure the SQ switch is in the correct position on both the LT-800 and the
receivers you are using. If your receivers do not have SQ, make sure the SQ
switch inside the top of the LT-800 is turned off (see page 5).
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. Try con-
necting a ground 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.
I cannot change the broadcast channel
When the unit is locked, the decimal by the channel indicator is illuminated.
The unit is locked. To unlock, press the Up and Down buttons simultaneously
for 5 seconds.
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 fre-
quency band (i.e. 72MHz or 216MHz) and that they are on the same channel.
Make sure the LT-800 has an antenna connected. Ensure that the receiver has
an antenna (LR-500, 400 or 300 headset or LR-100 or 600 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 chan-
nel. It’s a good idea to lock the channels once they have been set. To lock the
LT-800, press the UP and DOWN buttons simultaneously for a 5 seconds (see
page 6, Power Up instructions).

Troubleshooting
15
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 transmit-
ter 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 cor-
rect 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 72MHz, try
216 MHz or vice versa). Please contact Listen support for assistance and a return
authorization (RA) number to exchange product (no charge) for alternate frequen-
cy equipment.
End users are adjusting the unit.
First, lock the channel by pressing the UP and DOWN buttons simultaneously for
5 seconds. Consider removing the INPUT, MIX LEVEL and CONTOUR knobs.
You can order from Listen a rack mount kit and security cover that will limit access
to the unit.
If you are using other manufacturers’ receivers and the sound is dis-
torted
It is probably because the receiver is not designed to handle the +25kHz 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 dis-
able SQ in this event (see page 5).
Several transmitters operating in the same environment
For this, you’ll need to choose your transmitting frequencies carefully. See page 9
for more details.
Can I have two antenna’s connected to my transmitter?
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 antenna’s
are simultaneously connected to both ports the transmitter will have extremely
poor broadcast performance and range.
LT-800 Troubleshooting

Compliance Notice
16
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 (216MHz 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.
CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void 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 residen-
tial 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 interfer-
ence 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 equip-
ment. 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 man-
ufacturer could void the user’s authority to operate this equipment.
Compliance Notice

Warranty
17
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,
USA. Listen will only accept returned products with prepaid shipping and with a return authorization number. To
receive a return authorization number call 1.800.330.0891 or +1.801.233.8992. Please see www.ListenTech.com or
contact Listen for complete warranty details.
Warranty

Optional Accessories
18
Optional Accessories
Other Stationary Unit Antennas
Telescoping*
(Top Mount)
LA-106 for 72MHz or
LA-102 for 216MHz
72MHz Helical*
(Top Mount)
LA-101 for 72MHz
LA-122 Universal
Antenna Kit
The single solution for all of your
indoor remote antenna needs.
Includes: 72 and 216MHz compo-
nents; flexible and rigid dipoles and
monopole radials; hardware for mul-
tiple mounting configurations; and
25 feet (7.6 m) of RG58 coax cable.
90 Degree
Helical
(Rear Mount)
LA-123 for 72MHz or
LA-124 for 216MHz
216MHz Ground
Plane
(Remote Mount,
outdoor)
LA-107 for 216MHz
LT-800 Rack Mount Options
LA-326 Rack Mounting Kit*
Includes components for single and dual rack
configuration and a security cover Antenna
Kit for the
LA-3326
Rack Mount Kit
LA-125 for 72MHz and
LA-126 for 216MHz
* Rack mounted units cannot use the LA-106, LA-102 or LA-101 top mounted antenna.