Listen Technologies LR-100 User Manual

User’s Manual

LR-100 Stationary Receiver / Power Amplifier

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.

Welcome to Listen!

Dear Valued Customer,

Thank you for choosing Listen! All of us at Listen are dedicated to providing you
the hightest quality products and prompt, efficient customer care. Our products are
manufactured in an ISO-9000 factory that has been independently certified to the
highest quality standards. We stand ready to answer any questions you might have
during installation or in the operation of our products. Should there be any prob­lems with your Listen products, we are ready to help you in any way we can.
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

i

Listen™ and the Listen Logo are registered trademarks of Listen Technologies Corporation.

LR-100_2004_08_03 © 2003 Listen Technologies Corporation. All Rights Reserved.

· LR-100-072 (72MHz) or

· LR-100-216 (216MHz) or

· 120 VAC Power Supply

· LA-123 90 Degree Helical Antenna (72MHz) or

· LA-124 90 Degree Helical Antenna (216MHz)

· Allan Wrench

· Warranty Card

· User Manual

LR-100 Package Contents

LR-100-072 for 72 MHz
LR-100-216 for 216 MHz

Listen Part Number

See page 20

Optional Accessories

Table of Contents

Architectural Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Speaker Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Squelch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Listen SQ™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

RF Reception Maximization Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Resetting After an Overload Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Coaxial Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

72 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

216 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Compliance Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Table of Contents

Specifications

2

Architectural Specifications

The FM stationary receiver - power amplifier (receiver) shall be capable of receiving on 57 wide and narrow
band channels in the frequency ranges of either 72MHz or 216MHz. The receiver shall be programmable to
electronically lock out unneeded channels. The device shall have an adjustable squelch with an LED indica­tion. The frequency response of the device shall be within 3dB from 63Hz to 15KHz at 72MHz, or within 3dB
from 63Hz to 10kHz at 216MHz. The signal to noise ratio shall be 80dB or greater. The device will have an
integrated power amplifier capable of driving an 8 Ohm speaker. The device shall be rack mountable and shall
have the capability of a remote antenna. The device shall incorporate an LCD display that indicates channel
and RF signal strength. The Listen LR-100 is specified.

Specifications

Specifications

Specification LR-100-072 LR-100-216

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)

Sens itivity

Frequency Accuracy

Antenna

Flex ible helical,

9.0 in (23 cm) included

Flex ible helical,

5.5 in (14 cm) included

Optional Antennas

Antenna Conne ctor

Squelch

Compliance

System Frequency Response 63Hz - 15kHz (±3dB) 63Hz - 10kHz (±3dB)

System Signal-to-Noise Ratio
(A-weight ed)

SQ enabled: 80dB; SQ disabled 60dB

SQ enabled: 80dB; SQ disabled

50dB

System Distortion

Auxiliary I nput to Output

Balanc ed A uxiliar y Input

Unbalanced Auxiliary Input

Balanced Output

Unbalanced Output

Headphone Output

Speaker Output

Set-up Controls,
Fro nt Panel behind Security Cov er

Set-up Controls , Back Panel
User Controls

Remote Controls

Programming
VU Me ter

Power

LCD Display

Squelch

Mute

Power Supply Type

Power Supply Input

Power Supply Output

Power Supply Connecto r

Compliance

Optional Battery

Optional Battery Charging

Dimens ions

Unit W eight

Unit Weight w/LA-201 Power Supply

Shipping W eight

Rack Mo unting
Temperature - Operation

Temperature - Storage

Humidity

Trickle charge of optional 12VDC battery through terminal block

.6uV typical, 1 uV maximum for 12dB SINAD

Several available. See www.ListenTech.com for details

-10° to +40°C (14° to 104° F)

BNC

Rear panel. Two Phono connectors, unbalanced, -10 dBu nominal o utput

level, +2dBu maximum, impedance 2k Ohms

Front panel. One 3.5mm stereo connector, unbalanced, adjustable output

level, +16dBu maximum, impedance 32 Ohms, 120mW.

15VAC, 1A

.02 in OD x .01 in ID (5.0mm x 2.5mm) ID, barrel type

** All s ystem specifications are wir eless end-to-e nd

Green LED illuminates when the unit is squelched

12VDC, connected via terminal block

UL Listed

In-line power supply, Listen part number LA-2 01

120VAC, 60 Hz, 19 watts (maximum continuous)

Unit can be pr ogrammed so that only desire d channels ar e displayed to
the us er, chaannel s electio n can be loc ked by holding the SEEK button 5

seconds.

Four LED (three green, one red)

Green LED illuminates when the unit is power ed up

Channel, RF signal s tre ngth, lock status, pr ogramming

0-9 5% r elativ e humidity, non-condensing

2.8 lbs (1.3kg)

5.6 lbs (2.5kg)

1/2 rack unit (RU), optional rack mount not include,

order Listen part number LA-326

-20° to +50° (-4° to 122° F)

± .005% stability 0° to 5 0° C (3 2° to 122° F)

Rear panel, One detachable ter minal block, bridged, adjustable output

level, 15/10 watts (peak/RMS) continuous power with 4 Ohm load

Rear panel. Two Phono connectors, unbalanced, -10 dBu nominal input

level adjus table, +7dBu max imum, impe dance 10k Ohms

Rear panel. One Male XL R, balanc ed, 0 dBu nominal output le ve l, +16 dBu

maximum, impedance 2k/1 0 Ohms (line/mic)

Continuous ly adjustable via f ro nt pane l trim pot

Fre quenc y Respo nse: 25Hz to 2 0kHz (±3dB), SNR: >80 dB, Distor tion: <0.2%

Rear panel. One F emale XL R-1/4 in co mbo connec tor , balanced, 0dBu
nominal input level adjustable, +13dBu maximum, impedance 600 Ohms

FCC Part 15, Industry Canada

<2% total harmonic distortion (THD) at 80% deviation

Environmental

RF

Audio

Indicator s

Receive lev el, auxiliary input level, SQ on/o ff , sque lch

Audio output se lect (RX Only, RX + AUX, RX or AUX),

Speaker (Output, Aux), swit chable balanc ed output level

Controls

4.2 lbs (1.9kg)

Power

Physical

Green LED illuminates when the output audio is muted

Eight position detachable terminal block, channel up, channel down, mute

Volume, channe l UP/DOWN , SEEK (all cont rols exce pt volume are lockable )

8.0 in x 8.0 in x 1.75 in WxDxH (20.3cm x 20.3cm x 4.45cm)

Quick Refernce

3

Quick Reference

LR-100 Front Panel

VU METER: Set Receive and
Auxiliary levels so that the
red LED (at right) does not
illuminate

MUTE: when lit, the OUTPUT
audio is muted. MUTE is
activated and deactivated by
a momentary closure to
ground on the rear detach­able terminal block (see next
page).

SEEK: press to find the next
strong signal. Also used to
lock and unlock channel selec­tion; press and hold for 5 sec­onds. A padlock will appear
on the display when locked.
Press and hold again to
unlock.

HEADPHONE:

Connect a mono or
stereo headphone
here - 3.5 mm plug
(mini).

Look & Listen™

Display - see details
below

ACCESS PANEL
Remove to make set-up
adjustments

POWER switch: if
operated on battery,
switch is inoperative

SQUELCH: when
adjusted properly, this
LED is lit when the
transmit audio is not
being received.

UP and DOWN
channel tuning
buttons

SPEAKER control:
adjusts the volume of
your loudspeaker con­nected to the LR-100,
and/or the headphone.

LR-100 Behind Front Access Panel

SQUELCH adjustment: adjust so that
when your transmit audio is off, the
Squelch LED is illuminated. When
squelched, audio is muted (this
keeps you from hearing hiss in your
speakers)

RECEIVE audio level
adjustment

SQ: to activate, move
switch to ON position. This
switch should be turned
OFF if any of your equip­ment does not have SQ
capability.
See “Listen SQ” on Page
14 for more information.

AUXILIARY audio
level adjustment

RF Signal Strength

Indicates the currently
tuned channel

I/O: while in Program
mode, this symbol indi­cates that a channel is
locked out and will not be
available to the user. Press
SEEK to toggle channels
between Locked Out and
non-Locked Out modes.

PGM: when show­ing, the unit is in
Program mode to
lock out unwanted
channels from user
access.

When the padlock is visi­ble, the channel is locked.
Press and hold SEEK for
5 seconds to unlock or
lock.

LR-100 LCD Panel Details

Quick Reference

4

SPEAKER selection switch: this
selects the audio being routed
to the speaker amplifier to either
the OUTPUT or AUXILIARY audio.

Connect provided
power supply
here.

Optional 12V power: connect
optional battery or +12VDC
source here. The battery can
be recharged; see page 5.

CONTROL: remote
control of UP, DOWN
and MUTE functions.
All functions are
momentary closures to
common.

Unbalanced output:

phono, -10dBu nominal

AUDIO OUTPUT selection:

For RECEIVE audio only, select RX ONLY;
For RECEIVE audio mixed with AUXILIARY

audio, select RX + AUX;
For RECEIVE audio when not squelched

and AUXILIARY audio when squelched,
select RX or AUX

SPEAKER connection:
connect a 4 Ohm (or
greater) loudspeaker
here.

ANTENNA connection:
attach supplied 90 degree
helical antenna or optional
remote antenna here. Uses
standard 50 Ohm BNC
connector.

Balanced OUTPUT:

Male XLR, 0 or

-40dBu nominal

Unbalanced AUXILIARY
input: phono, -10dBu

nominal

Quick Reference

LR-100 Rear Panel

Balanced AUXILIARY input:

Combination Female XLR - ¼ in
connector; 0dBu nominal

MIC/LINE level switch:

reduces the balanced
OUTPUT audio gain by
40dB in Mic mode

Two internal
2 amp, fast
blow fuses

Block Diagram

5

LR-100 Block Diagram

115VAC

External Power

Supply
LA-201

Remote

Antenna

(Flexible helixal

antenna provided)

BNC

Power
On/Off

RF Receiver

Board

Sensitivity

Squelch

Squelch

+12 VDC

External Battery

Ground

Power Supply

CPU Module

Audio Processing

Module

Remote Control

5 6 7 8 3 4 1 2

Receive Level

Auxiliary

Level

Common

Listen LCD Display

SQ

On/Off

(internal)

Electronic

Switch

Up

Down

Seek

RX + Aux

RX

RX or Aux

Output
Select

Electronic

Switch

Mute

Aux

Output

Mic

Speaker

Line

Speaker

Male XLR

3.5MM
Stereo

Phono

XLR-1/4"
Combo

Detachable

Terminal

Block

Headphone

Output

Balanced

0 dBu

Output

Unbalanced

-10 dBu

VU

Meter

Auxiliary Input

Balanced

0 dBu

Phono

Auxiliary Input

Unbalanced

-10 dBu

Setup

6

LR-100 Setup Instructions

LR-100 Setup Instructions

· If you are using the LR-100’s power amplifier, make
sure the unit is given sufficient room around the
ventilation holes.

· If you are rack mounting the LR-100, use the
optional LA-326 rack mounting kit. This kit allows
for single and dual rack mounting, and comes with
a security cover.

· For mounting on vertical or horizontal surfaces, use
the optional L bracket mounting kit, part number
LA-327.

Powering the Unit

Please note: if the unit will not power up, see
Resetting After an Overload Condition, page 14.

AC Power Operation

The unit comes with a UL listed inline power supply
designed for 115VAC, 60Hz operation. Do not use
any other AC power supply. Use of any non-Listen
supplied power supply will void the warranty. (Battery
use is permitted; see below.) Plug the power supply
into the back of the unit at the connector labeled
POWER. Now connect the power supply to power.

Battery Operation

To operate the unit on a battery or +12VDC power
supply, connect to the rear detachable terminal block
as follows:

i. Pin 3: +12VDC
ii. Pin 4: Ground

Please note that when operating on the +12VDC bat­tery supply, the POWER switch is bypassed and the
unit is always on.

You can optionally charge batteries by also supplying
power to unit with the batteries connected. In this
case, the batteries are trickle charged at a rate of 18 ­36 mA. You should only use rechargeable type batter­ies.

CAUTION: Attempting to charge non-rechargeable
batteries may result in explosion and/or fire.

Detachable Terminal Block Wiring:

Pin 1: Speaker +
Pin 2: Speaker –
Pin 3: Ground for Battery or Power Source

connection
Pin 4: +12VDC Battery or Power Source
Pin 5: UP remote control function
Pin 6: DOWN remote control function
Pin 7: MUTE remote control function
Pin 8: Common for remote control function

Transmission

7

Installation - Audio Connections

(See Quick Reference on pages 3-4.)

OUTPUT Audio

The OUTPUT audio section is composed of an OUT­PUT audio selection switch, a male XLR balanced
audio OUTPUT connector and two phono unbalanced
audio OUTPUT connectors.

OUTPUT Audio Selection Switch

This switch selects what audio is routed to the OUT­PUT audio connectors. The switch has three posi­tions:

1. RX ONLY. In this position, only RECEIVE audio is
routed to the OUTPUT. When the transmitter is
turned off, the unit is squelched and the RECEIVE
audio is muted.

2. RX + AUX. In this position, both the RECEIVE
and AUXILIARY audio are mixed and routed to
the OUTPUT.

3. RX or AUX. In this position, the OUTPUT audio
is either RECEIVE or AUXILIARY audio. When
the RECEIVE audio is squelched (indicated by the
illumination of the SQUELCH LED on the front
panel), AUXILIARY audio is routed to the OUT­PUT. When RECEIVE audio is not squelched,
RECEIVE audio is routed to the OUTPUT.

Balanced Audio Output

When connecting to the XLR balanced OUTPUT, use
the pin out shown below. If the output is unbalanced,
either use the unbalanced phono connectors or wire
the balanced XLR output as shown below with pins 3
and 1 wired together. The OUTPUT audio has a
nominal output level of 0dBu.

XLR pin out diagram for a balanced connection:

Pin 2 +

Pin 3 –
Pin 1 Shield

XLR pin out diagram for a unbalanced connection:
Pin 2 +
Pin 1 and 3 –

LINE/MIC Switch

This switch reduces the OUTPUT level of the bal­anced OUTPUT audio only. It does not affect the
OUTPUT level of the unbalanced audio. The OUT­PUT audio is reduced by 40dB to microphone level
when this switch is selected to MIC.

Unbalanced Audio Output

There are two unbalanced phono audio OUTPUT
connectors. The nominal OUTPUT audio level is
–10dBu.

AUXILIARY Input

The LR-100 has an AUXILIARY input that allows for
greater functionality of the unit for a variety of appli­cations. The AUXILIARY input consists of a bal­anced input, combination connector (female XLR and
¼ in) and two unbalanced phono connectors. All of
these inputs are actively mixed together. Thus, any
combination of input sources can be used. Input level
is adjusted via the front panel trim pot labeled AUX
LEVEL ADJUST. Adjust this level to fit the needs of
your installation ensuring the last red LED on the VU
meter is not illuminated (indicating peak audio).

AUXILIARY Balanced Audio Input:

The nominal input level for the balanced input is
0dBu.

Female XLR / ¼ in combination connector pin outs:
Pin 2 (tip) +
Pin 3 (ring) –
Pin 1 (sleeve) Shield

AUXILIARY Unbalanced Audio

Input:

The nominal input level for the two unbalanced inputs
is -10dBu.

Female XLR / ¼ in combination connector pin outs:
Pin 2 (tip) +
Pin 1 and 3 ring/sleeve

LR-100 Installation

Speaker/Antenna Install

8

LT-100 Speaker Connection

The LR-100 contains a 44-watt (31 watt RMS), 4
Ohm power amplifier.

The Speaker Selection switch determines what audio is
directed to the power amplifier. With the switch in
the OUTPUT position, the OUTPUT audio (same
audio that is on the OUTPUT audio connectors) is
directed to the power amplifier. With the switch in
the AUX position, only AUXILIARY input audio is
directed to the power amp. This allows you to use the
power amp separate of the RECEIVER audio if desired.

NOTE: When the speaker switch is in the OUTPUT
position and the MUTE control is enabled (indicated
by the illumination of MUTE LED), the speaker out­put is also muted.

Connection to the speaker is achieved through pins 1
and 2 on the detachable terminal block. Strip the
speaker wires, rotate the screws on the terminal block
counter-clockwise, insert the wires and then tighten
the screw clockwise until the wire is secure in the con­nector block. You may connect any parallel, series
combination of speakers that produces an impedance
of 4 Ohms or greater.

EXAMPLE: If you have two 8 Ohm speakers, you can
connect these in parallel to produce a 4 Ohm load to
the power amp.

The SPEAKER level control on the front panel adjusts
the level of the speaker.

The front panel headphone jack is in parallel with the
speaker level. Connect any mono or stereo headphone
to this 3.5mm jack. Adjust level with the SPEAKER
volume knob.

Installation – Antenna

A properly installed antenna is critical to the opera­tion of the LR-100. Without a strong and consistent
RF signal from the transmitter, the LR-100 will not
meet the needs of your installation. You can use the
RF POWER indication on the LCD to provide a rela­tive RF signal strength. You should see four or more
dots displayed on the LCD for best results.

Using the supplied helical antenna

Connect the antenna to the rear BNC connector and
orient the antenna vertically. If reception is from the
transmitter is not adequate, consider using a remote
antenna (see below) or place the LR-100 at an
improved location to improve the signal strength. See
RF Reception Maximization Strategies on page 15 for
more information.

Using a remote antenna

For better reception in longer broadcast range applica­tions, you should use a remote antenna. A remote
antenna will allow you to get the antenna higher in
altitude and in a position that is clear of obstructions.
Please refer to the specific antennas instructions for
installation. Also refer to “Strategies for Maximizing
RF Reception” on page 15 for additional information.

CAUTION: When installing antennas, ensure the
antenna is clear of power lines.

NOTES: If the RF signal to the 216MHz model is too
high, the audio will be distorted. This may happen if
the LR-100 is within 40 feet of the LT-800-216 trans­mitter. Consider reducing the output power of the
transmitter or optionally removing the antenna on the
LR-100 (there is sufficient internal antenna inside the
LR-100 to receive an adequate signal from the trans­mitter).

LR-100 Antenna Installation

Programming

9

LR-100 Programming

To make setup adjustments, remove the two hex screws
that secure the front panel security cover.

Setup VU Meter

The front panel VU meter indicates the audio level of
the OUTPUT signal. When making input audio level
adjustments, ensure that the red LED does not illumi­nate.

Input Audio Levels

Proper adjustment of input levels is critical to the
proper operation of the LR-100.

a. Receiver Audio Level Adjustment. Under normal

audio conditions adjust the receive audio level to
meet the output level needs of your installation.
Make sure that the red LED on the VU meter does
not illuminate.

b. Auxiliary Input Level Adjustment. Under normal

audio conditions adjust the receive audio level to
meet the output level needs of your installation.
Make sure that the red LED on the VU meter does
not illuminate.

Selecting SQ ON or OFF

See Listen SQ™ on page 12. If the transmitter that is
broadcasting to the LR-100 is SQ capable, make sure
the SQ switch for the transmitter and the LR-100 is
turned ON. If not, the SQ switch should be turned
OFF.

Channel Selection

Select the most appropriate channel by pressing the
UP or DOWN button (see Channel Selection on page

13). You can also press the SEEK button and the unit

will SEEK for the strongest RF signal. 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 find the
clearest operating channel.

To Lock Into Only One Channel: press and hold the
SEEK button for 5+ seconds to lock a receiver into the
currently tuned channel. Press and hold the button
again to unlock.

NOTE: It is highly recommended to lock the channel
after installation to prevent accidental channel selec­tion.

Programming

In some cases, you may choose to give users the ability
to select multiple channels. For example, let’s say you
are using the LR-100 for language interpretation. In
this example, channels A, E and I are three different
languages. You can use the LR-100 programming fea­ture to lock out all but the three channels used in this
example. By pressing the UP or DOWN button, the
user can select between the three channels.

To Lock Out Channels in the LR-100:

· Simultaneously press and hold the UP and DOWN
buttons. You will notice the PGM indicator on the
LCD indicating you are in the programming mode
(the unit will go out of the programming mode if
you don’t press a key for 10 seconds).

· Use the UP and DOWN buttons to select the chan­nels you want to lock out.

· As channels are displayed on the unit, those chan­nels that are locked out from user access will be
indicated by the L/O symbol on the display. When
a channel is locked out, the LR-100 will skip over
that channel when a user is tuning the unit. Press
the SEEK button while in program mode to lock
out a channel (lock out means the channel will
NOT be displayed to the user). To reverse the lock
out process, press the SEEK button on locked out
channels.

· When you have completed programming the unit,
don’t press any key for 10 seconds and the unit will
exit the programming mode.

Squelch Adjustment

10

Squelch Adjustment

Squelch

The squelch adjustment is important to ensure the
receiver audio is muted when no signal is present. You
want to set the squelch adjustment for the highest set­ting without squelching the incoming signal.

To set the squelch control:

a. Turn the transmitter OFF.
b. Listen to the receiver audio on the speaker or head-

phone. Turn the audio level down in the begin­ning.

c. Adjust the squelch adjustment clockwise until the

squelch LED goes off (not illuminated). You will
hear radio noise now. This is the audio you want to
squelch (mute) when the transmitter is off.

d. Now adjust the squelch setting counter clockwise

until it squelches (mutes). This is the minimum
squelch setting.

e. Now turn the transmitter on. Adjust the squelch

setting counter clockwise until the unit squelches.
This is the maxium squelch theshold. Please note
that if you are close to the transmitter, you may not
be able to find the maxium squelch threshold due to
the high RF signal of the transmitter.

f. Set the squelch adjustment between the maximum

and minimum squelch thresholds, keeping the fol­lowing in mind.

· Minimum squelch threshold. By adjusting the unit
near this threshold, you will maximize the probabili­ty the unit will NOT squelch when the transmitter
is on. However, you also run the risk having the
unit NOT squelched (and resulting radio noise
coming through the system) when the transmitter is
off. You may experience unsquelching of the
receiver by interference as well.

· Maximum squelch threshold. By adjusting the unit
near this threshold, you will greatly increase the
chance the unit will squelch when the transmitter is
off AND you will minimize the probability that the

unit will be unsquelched by interference. However,
you are also increasing the chances that the signal
coming from the transmitter will be squelched.
Thus, if the RF signal from the transmitter dips just
slightly (someone walks in front of the antenna),
you will experience momentary squelching of the
audio.

CAUTION: Ensure proper setting of the squelch
adjustment to prevent user ear damage and unwanted
radio noise. Users will find unsquelched receiver noise
very objectionable.

Troubleshooting

11

The unit does not power up

Ensure the power supply and/or battery is connected properly. Please note: this
product no longer utilizes internal fuses. The fuses have been replaced with an
automatic resetting devie that automatically protects the device in an overload
condition. See Appendix F: Resetting After an Overload Condition for more
details.

The audio is muted occasionally

Check to see if the unit is squelching (indicated by the squelch LED). In this
case, either improve the RF signal path or adjust the squelch setting for less
squelch sensitivity (see page 9).

I hear noise coming from the receiver (with my audio)

You may have inadequate RF signal strength. Adjust the positioning of the
antennas. Make sure the transmitter is on high power. You may be experienc­ing interference; try a different channel. Make sure the transmitter and receiv­er are on the same channel.

The channel is often accidentally changed

Lock the unit on channel by pressing and holding the SEEK button for five
seconds. The padlock symbol is illuminated on the LCD.

There is no audio

Make sure the transmitter and the receiver are on the same frequency band
(72MHz or 216MHz) and channel. Make sure the RECEIVE and/or AUX trim
adjustments are turned clockwise. Make sure the unit is not MUTED, indicat­ed by the MUTE LED. Make sure the unit is wired correctly. Make sure the
squelch adjustment is set correctly.

The audio is distorted

Make sure the transmitter and receiver are on the same channel. Make sure
that the SQ switch is set the same way either ON or OFF for both the trans­mitter and receiver. Make sure the audio level is not set too high. For the
216MHz version only, make sure you are not too close to the transmitter (with­in 40 feet).

The OUTPUT level is low

Make sure the MIC/LINE switch is in LINE. Adjust the RECEIVE or AUX
input levels.

There is no audio on the speaker

Make sure the speaker selection switch is in the correct position. Ensure that
you have a good speaker.

I can’t hear AUX audio on the OUTPUT

Move the OUTPUT audio selection switch to either “RX + AUX” or “RX or
AUX” depending on your application.

I cannot change channels

The unit is locked on channel (this is indicated by the padlock icon on the dis­play). Press and hold the SEEK button for five seconds to toggle the lock off.

The power switch does not work

This is normal when using the +12VDC power on the rear terminal block.

LR-100 Troubleshooting

Listen SQ ™/ Squelch

12

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, are inherently noisy
compared to most sound systems. To reduce noise of our systems, Listen now offers
a noise reduction technology called ListenSQ™. Both the transmitter and receiver
must have SQ on to achieve the desired results. SQ is now 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 or equipment not manufactured by
Listen, you should disable 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 perform­ance 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 per­mit operation with older
Listen products or other
manufacturers’ products

Channel Selection

13

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
LR-100, press the SEEK button for 5 seconds. Repeat the process to unlock. 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). 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 narrowband transmission system,
always use a wide band channel. If you are using multiple channels follow this
process:

a. Same Space If you are using transmitters in the same space, the most num-

ber 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 13-14, 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 13-

14) in this case as long as the adjacent channel transmitter is at least 50% fur­ther 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 trans­mitter on channel D should be at least 150 feet away.

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 type 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

RF Reception/Resetting

14

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.
g. For 216MHz unit only, consider using a gain antenna such as a Yagi type

antenna.

CAUTION: When installing antennas, ensure the antenna is clear of power lines.

NOTE: If the RF signal to the 216MHz models is too high, the audio will be dis­torted. This may happen if you are within 40 feet of the LT-800-216 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

In an overload condition, the LR-100 will go into a protective state to protect the
unit and power supply from excessive current and heat. This condition will occur if
the speaker terminals are shorted to each other or if they are shorted to the chassis
for over 15 seconds. In this condition, the LR-100 will no longer function normally.
If the LR-100 stops functioning normally, do the following:

1. Turn the unit off and unplug it from power. If you are operating the LR-100 with
an external +12VDC source such as a battery, disconnect the power source from
the unit.

2. Remove the short to the speaker terminals.

3. Wait 30 seconds or longer.

4. Plug the unit back in and turn the power on.

The LR-100 should now function normally. If the unit is still not functioning nor­mally, contact Listen Support.

Resetting After an Overload Condition

Coaxial Cable

15

The antenna for the LR-100 can be mounted directly on the unit if desired.
However, you may find that the unit will provide better performance when the
antenna is located elsewhere. If you plan to mount the antenna in a different loca­tion 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 large 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

16

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.

Freque ncy

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

17

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

Compliance Notice

18

Listen’s LR-100 Stationary Receiver / Power Amplifier

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.

FCC Statement

This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no guar­antee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:

· Reorient or relocate the receiving antenna.

· Increase the separation between the equipment and receiver.

· Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

· Consult the dealer or an experienced radio/TV technician for help.

This equipment has been certified to comply with the limits for a class B computing device, pursuant to FCC and IC
Rules. In order to maintain compliance with FCC and IC regulations, shielded cables must be used with this equip­ment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV
reception. The user is cautioned that changes and modifications made to the equipment without the approval of manu­facturer could void the user’s authority to operate this equipment.

Compliance Notice

Warranty

19

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

20

Optional Accessories

LA-122 Universal

Antenna Kit

The single solution for all of your
indoor remote antenna needs.
Includes: 72 and 216MHz compo­nents; flexible and rigid dipoles and
monopole radials; hardware for mul­tiple mounting configurations; and
25 feet (7.6 m) of RG58 coax cable.

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

216MHz Ground Plane

(Remote Mount,

outdoor)

LA-107 for 216MHz

LA-327 “L” Bracket Mount Kit

Use to mount on any flat surface

LA-316 Expansion Speaker

10 Watt, 2 channel speaker

Expansion Speaker

See www.ListenTech.com/LR-100.cfm fro additional features,
specifications and accessories.

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]