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