Listen LT-800-150 Manuale utente
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outstanding performance because we care that you are completely
satised. 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,
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have any comments on how we might improve our products or our
service, we’re here to listen.
Here’s how to reach us:
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+1.801.233.8995 fax
www.listentech.com
Thank you and enjoy your listening experience!
Best regards,
Russell Gentner and the Listen Team
• In the few instances where repairs were needed, 99% of all clients indicated that they were happy with
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Assistive Listening • Language Interpretation • Soundeld • Tour Group • Conferencing
1
Package Contents 3
150 MHz Specications 4
Block Diagram 5
Quick Reference 6
Setup Instructions 7
Operating Instructions 10
Audio Control 11
Listen SQ™ (Super Quiet) 12
RF Reception Maximization Strategies 13
Coaxial Cable 13
Channel Selection 14
150 MHz Frequency Chart 15
Troubleshooting 16
Warranty 18
Contacting Listen 18
Optional Accessories 19
LT-800 Table of Contents
3
LT-800 Package Contents
Optional Accessories
See pages 19-20
Listen Part Number
LT-800-150 (150 MHz)
LT-800 Contents
• LT-800-150 (150 MHz)
• 12 VDC Power Supply
• User Manual
• Quick Reference Card
4
LT-800 Specications
Architectural Specications
The stationary FM transmitter shall be capable of broadcasting on 32 channels. The transmitter
shall have an SNR of 80 dB or greater. The output power shall be adjustable to quarter, half or
full. Channel tuning shall be capable of being locked. The device shall have an audio
frequency response of 50 Hz to 15 kHz (±3 dB). It shall have two (2) mixing audio inputs and a
mixed signal output. The device shall have the following audio controls: input level, mix level
and an adjustable low pass filter (contour). The device shall have an audio processor that is
capable of automatic gain control and limiting. The Listen LT-800-150 is specified.
*Specications are subject to change without notication
Specications*
Audio
RF Frequency Range 150.8000 MHz - 152.3500 MHz
Number of Channels 6 wideband, 26 narrowband
Number of Simultaneous
Transmitters
6
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50ºC)
Transmitter Stability 50 PPM
Transmission Range Up to 762 m (2500 ft.)
Output Power 100 mW
System Frequency Response 50 Hz - 15 kHz (±3 dB)
System Signal to Noise Ratio SQ enabled 80 dB, SQ disabled 60 dB
System Distortion <2% total harmonic distortion (THD) at 80% deviation
Audio Input 1 Rear panel, one (1) 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 +12 VDC
Audio Input 2 Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable,
+30 dBu maximum, impedance 100k ohms
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 5 kHz
Combined Audio Output (Mix) Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu
maximum, impedance 10 ohms
Headphone Output (Monitor) Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10
ohms
Controls &
Indicators
Front Panel Power, Test Tone on/off, Channel up/down, Input Levels, Mix Level, Contour, Monitor volume control
Rear Panel "Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)"
Programming Process on/off, SQ on/off, channel lock
Input1, 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 enabled.
Power
Power Supply In line power supply (Listen part number LA-207)
Power Supply Input Input: 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Output Output: 12 VDC, 1.3 A, 15.6 W
Power Supply Connector Output Connector: 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
Power Supply Compliance UL, CE, GS, TÜV, RoHS
Physical
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
Unit Weight 2.6 lbs. (1.2 kg)
Shipping Weight 6 lbs. (2.7 kg)
Environmental
Temperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
Humidity 0 to 95% relative humidity, non condensing
5
In-Line
Power Supply
LA-201
(provided)
115VAC6
0 Hz
Top Mounted
Antenna Stud
BNC
Listen LCD Display
Backlighted
HEADPHONE
3.5MM
Stereo
15VAC, 1A
Transmitter RF Board
Power Supply
CPU Module
SQ
Companding
ProcessingPre-emphasis
POWER
On O
PROCESS
SQ
ANTENNA
Functions controlled by the CPU
Module
Volume
Up
Down
Remote
Antenna
Connection
On O
Compression Ratio
(internal adjustment)
Red
LED
Green
LED
Green
LED
CONTOUR
MIX LEVEL
CHANNEL SELECT
On OLow High
Mid
Female XLR-1/4"
Combo Connector
2/Tip
3/Ring
Line
1/Sleeve
Mic
12VDC
Mic
Phantom Pwr
Input 1 Level Select
Mic-Phantom Pwr, Mic, Line
-10dBu+10dBu
Input 2 Level Select
+10dBu/-10dBu
Phono Phono
Input Level
Front Panel
400Hz
TEST TONE
OFF ON
Red
LED
Test Tone Button
Front Panel
MIX OUTPUT
Input 1 VU
Meter
Input 2 VU
Meter
INPUT 2
INPUT 1
RF POWER
MIX Level
VU Meter
LT-800 Block Diagram
6
Adjust audio input levels
of Input 1 and Input 2
here. See page 11 for
more information.
Indicates audio input
level of Input 1 and
Input 2. Shows
mixed audio
level.
Indicates
Process Mode
is active.
LCD: Shows
which channel
is selected.
Monitor Port: Plug
in a headset and
adjust volume.
Channel Select Down:
Press for 8 seconds to
enter program mode.
See page 8 for more
information.
Contour: Equalization
adjustment. 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.
Power
ON / OFF
The Listen LA-207
power supply
connects here.
Set RF Power level here
(¼, ½, and Full). See
page 8 for guidelines
on setting power levels.
Input 2: Connect
unbalanced audio to these
phono connectors, input
level -10 dBu or +10 dBu.
Input 2: Set switch to
match the level of your
Input 2 audio source,
not used to increase or
decrease level by +10 dBu.
Input 1: Used for balanced
connection of a microphone
or line level input. This
combination connector
accepts either XLR or ¼”
phono plugs.
Select Line, Mic or Mic+Phantom
Power. Line is balanced 0 dBu
input level, Mic is -55 dBu,
+12 VDC supplied in PH Power
position. If not using input 1, leave
in line position.
Mix Output: These connectors
contain a mix of Input 1 and
Input 2. They are unbalanced
phono connectors; and the
output level is -10 dBu.
Remote Antenna Connection:
See page 19 or the Listen
website for details on antennas
that can be attached here.
Top mount antenna connection:
Remove rubber plug and screw
antenna in place.
Indicates
Super Quiet
mode is active.
Channel Select Up:
Press for 3 seconds
to lock on current
channel.
LT-800 Back Panel: Connections & Settings
LT-800 Front Panel: Controls & Displays
LT-800 Quick Reference
- +
12 VDC 1.3 A
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