Listen Technologies LR-100-072 Users Manual

Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to providing

you with the highest quality products available. We take great pride in their
outstanding performance because we care that you are completely
satisfi ed. That’s why we independently certify them to the highest quality
standards and back them with a limited lifetime guarantee. We stand ready
to answer any questions you might have during installation or in the operation
of our products. Should you experience any problems whatsoever with your
Listen products, we are ready to help you in any way we can with prompt,
effi cient customer care. Because at Listen, it’s all about you! And should you
have any comments on how we might improve our products or our
service, we’re here to listen.

Here’s how to reach us:
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995

North America
fax

[e-mail]
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
repair turn-around-times and 85% of the time, clients were without their product for less than 10 days!

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Assistive Listening • Language Interpretation • Soundfi eld • Tour Group • Conferencing

Tab
le

of

Con

ten
ts

Spe

cifi
cations

Set

up

Instructions

Operating

Instructions

RF
Rec

ept

ion

Information

Channel

Selection

Package Contents

Quick

Reference

Listen

SQ™

Com

pat

ibilit

y C

harts

ents

kage

Contentskage Contents

LR-100 Table of Contents

Package Contents 3
Specifi cations 4
Architectural Specifi cations 4
Specifi cations 4

Quick Reference 6
Block Diagram 8
Setup Instructions 9
Installation 11
Speaker Connection 12
Antenna Installation 12

Programming 13
Squelch Adjustment 14
Listen SQ™ 15
Channel Selection 16
RF Reception Maximization Strategies 17

Resetting After an Overload Condition 17
Coaxial Cable 18
72 MHz Frequency Compatibility Table 19
216 MHz Frequency Compatibility Table 20

Table of Contents

Table of Contents Package Contents Specifi cations Quick Reference

Package Contents
Table of Contents

Specifi cations

Quick Reference

Setup Instructions Operating Instructions

Supplementary Information 21
Troubleshooting 21
Compliance Notice 22
FCC Statement 22
Warranty 23
Contacting Listen 23
Optional Accessories 24

1

Listen SQ™

Setup Instructions Programming

RF Reception

Channel Selection

Compatibility Charts

Information

Information

Spe

cifi
cations

LR-100 Package Contents

LR-100 Contents

• LR-100-072 (72 MHz) or

• LR-100-216 (216 MHz)

• 120 VAC Power Supply

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

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

• Allen Wrench

• Warranty Card

• User Manual

Listen Part Number

LR-100-072 (72 MHz)
LR-100-216 (216 MHz)

Optional Accessories

See page 22

Package Contents

Specifi cations

3

Rec
ept

ion

RF Reception

Specifi cations

LR-100 Specifi cations

Architectural Specifi cations

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 72 MHz or 216 MHz. 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 63 Hz to
15K Hz at 72 MHz, or within 3dB from 63 Hz to 10 kHz at 216 MHz. The signal to noise ratio shall be 80 dB 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.

Specifi cations LR-100-072 LT-800-216

RF Frequency Range 72.025 - 75.950 MHz 216.025 - 216.9875 MHz
Number of Channels 57 (17 wide band, 40 narrow band) 57 (19 wide band, 38 narrow band)
Frequency Accuracy ± .005% stability +32º to +122 ºF (0º to +50 ºC)

RF

Audio

Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Optional Antennas Various antennas available
Antenna LA-123 90° Helical Antenna (72 MHz) LA-124 90° Helical Antenna (216 MHz)
Antenna Connector BNC
Compliance FCC Part 15, Industry Canada FCC Part 90, Industry Canada

System Frequency Response 50 Hz - 15 kHz (±3 dB) 50 Hz - 10 kHz (±3 dB)
System Signal to Noise Ratio

(A-Weighted)
System Distortion <2% total harmonic distortion (THD) at 80% deviation
Auxiliary Input to Output 25 Hz to 20 kHz (±3 dB) frequency reponse, SNR 80 dB, Distortion: <0.2%

Balanced Auxiliary Input

Unbalanced Auxiliary Input

Balanced Output

Unbalanced Output

Headphone Output (Monitor)

Speaker Output

80 dB SQ enabled, 60 dB SQ disabled 80 dB SQ enabled, 50 dB SQ disabled

Rear panel, one (1) female XLR-1/4 in combo connector, balanced, 0 dBu nominal input level adjustable, +13 dBu

Rear panel, two (2) phono connectors, unbalanced, -10 dBu nominal input level adjustable, +7 dBu maximum,

Rear panel, two (2) phono connectors, unbalanced, -10 dBu nominal output level, +2 dBu maximum, impedance

Front Panel, one (1) 3.5mm stereo connector, unbalanced, adjustable output level, +7 dBu maximum, impedance

Rear panel, one (1) detachable terminal block, bridged, adjustable output level, 15/10 watts (peak/RMS) continuous

** All system specifi cations are wireless end-to-end

maximum, impedance 600 ohm

impedance 10k ohm

Rear panel, one (1) male XLR, balanced, 0 dBu nominal output level, +16 dBu maximum, impedance

2k/10 Ohms (line/mic)

2k ohm

10 ohm

power with 4 ohm load

Controls

Indicators

Power

Set-up Controls Front Panel
(Behind Security Cover)

User Contols Volume, channel UP/DOWN, SEEK (all controls except volume are lockable)
Set-up Contors Rear Panel
Remote Controls Eight (8) position detachable terminal block, channel up, channel down, mute
Programming

VU Meter Four (4) LED (three green, one red)
Power 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)
Squelch Green LED illuminates when the unit is squelched
Mute Green LED illuminates when the output audio is muted

Power Supply Type In line power supply, Listen part number LA-201
Power Supply Input Input: 120 VAC, 60 Hz, 19 Watts
Power Supply Output Output: 15 VAC, 1 Amp
Power Supply Connector Output Connector: .02 in (5.0 mm) OD, .01 in. (2.5 mm) ID, barrel type
Power Supply Compliance UL Listed
Optional Battery 12VDC, connected via terminal block
Optional Battery Charging Trickle charge of optional 12VDC battery through terminal block connection

Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume control

“Audio output select (RX Only, RX + AUX, RX or AUX),

Speaker (Output, Aux), switchable balanced output level”

Unit can be programmed so that only desired channels are displayed to the user, channel selection can be locked by

holding the SEEK button 5 seconds.

4

Physical

Environmental

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 2.8 lbs. (1.3 kg)
Unit Weight with LA-201

Power Supply
Shipping Weight 5.6 lbs. (2.5 kg)

Rack Mounting

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

One (1) rack space height, 1/2 rack space wide, one (1) or two (2) receivers can be mounted in one rack space, optional

Specifi cations are subject to change without notifi cation

4.2 lbs. (1.9 kg)

rack mount (LA-326)

Specifi cations

5

Instructions

LR-100 Quick Reference

LR-100 Front Panel

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

POWER SWITCH:
If operated on battery,
switch is inoperative.

Quick Reference

Operating Instructions

LR-100

Power

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).

Output Level

ACCESS PANEL:
Remove to make set-up
adjustments.

Mute

Squelch

UP and DOWN:
Channel tuning
buttons.

SQUELCH: Adjustable
squelch LED indicator
for signal capture
control.

Up

Down

RF Power

Look & Listen™
Display: See details
below

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.

Channel

Seek

Headphone

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

Speaker

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

LR-100 Behind Front Access Panel LR-100 LCD Panel Details

SQUELCH: Adjust so that when

RECEIVE AUDIO LEVEL
ADJUSTMENT

AUXILIARY
AUDIO LEVEL
ADJUSTMENT

your transmit audio is off, the
Squelch LED is illuminated. When
squelched, audio is muted (this
keeps you from hearing hiss in your
speakers).

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 15 for more
information.

RF SIGNAL STRENGTH

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.

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.

6

Operating

Instructions

LR-100 Quick Reference (cont.)

LR-100 Rear Panel

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.

OPTIONAL 12V POWER: Connect
optional battery or +12VDC source
here. The battery can be recharged; see
page 8.

CONTROL: Remote
control of UP, DOWN
and MUTE functions.
All functions are

BALANCED OUTPUT:
Male XLR, 0 or

-40dBu nominal.

momentary closures
to common.

UNBALANCED OUTPUT:
Phono, -10dBu nominal.

Unbalanced AUXILIARY
input: phono, -10dBu
nominal.

Antenna

Two internal
2 amp, fast
blow fuses

Connect provided
power supply here.

Power

Battery Control

12VDC

Speaker

-

++

Output

Aux

Ground

Up

Down

Mute

SPEAKER SELECTION SWITCH:
This selects the audio being
routed to the speaker
amplifier to either the OUTPUT
or AUXILIARY audio.

Common

Audio Output

RX Only

RX +
AUX

RX or
AUX

MIC/LINE LEVEL SWITCH:
Reduces the balanced
OUTPUT audio gain by
40dB in Mic mode.

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.

Mic

Line

Auxiliary Input

Operating Instructions

Quick Reference

BALANCED AUXILIARY INPUT:
Combination Female XLR - ¼ in
connector; 0dBu nominal.

7

Instructions

d

e

l

d

e

LR-100 Block Diagram

External Power

115VAC

Supply
LA-201

Remote

Antenna

(Flexible helixal

antenna provided)

Quick Reference

Operating Instructions

BNC

Power
On/Off

RF Receiver

Board

Squelch

Squelch

Sensitivity

+12 VDC

External Battery

Ground

Power Supply

CPU Module

Audio Processing

Module

Remote Control

5 6 7 8 3 4 1 2

Common

Electronic

Switch

Up

Mute

Aux

Output

Mic

Line

Speaker

Listen LCD Display

SQ

On/Off

(internal)

RX + Aux

Down

Seek

RX

Receive Level

Auxiliary

Level

Electronic

Switch

RX or Aux

Output
Select

Speaker

Male XLR

3.5MM
Stereo

Phono

XLR-1/4"
Combo

Detachab

Terminal

Block

Headphon

Output

Balance

0 dBu

Output

Unbalanc

-10 dBu

VU

Meter

Auxiliary

Balance

0 dBu

Phono

Auxiliary

Unbalanc

-10 dBu

8

RF
Rec

ept

ion

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

1

NOTE: if the unit will not power up, see Resetting After an Overload Condition, page 17.

AC Power Operation

The unit comes with a UL listed inline power supply designed for 115 VAC, 60 Hz 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:

1. Pin 3: +12VDC

2. Pin 4: Ground

NOTE: 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

Installation - Audio Connections (See Quick Reference on pages 6-7.)

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:

Setup Instructions

RF Reception

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.

9

LR-100 Setup Instructions (cont.)

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) +

Setup Instructions

Pin 1 and 3 ring/sleeve

10

RF
Rec

ept

ion

LR-100 Installation - Audio Connections

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.
RX or AUX. In this position, the OUTPUT audio is either RECEIVE or AUXILIARY audio. When the RECEIVE audio

3

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 0 dBu.

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 40 dB to microphone level when this switch is
selected to MIC.

AUXILIARY Unbalanced Audio Input

The nominal input level for the two unbalanced inputs is -10 dBu.
Female XLR / ¼ in combination connector pin outs:

Pin 2 (tip) +
Pin 1 and 3 ring/sleeve

Setup Instructions

RF Reception

11

LR-100 Setup Instructions

LR-100 Speaker Connection

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

4

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 3.5 mm jack. Adjust level with the SPEAKER volume knob.

5

Setup Instructions

LR-100 Antenna Installation

Installation of 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 17 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 17 for
additional information.

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

NOTES: If the RF signal to the 216 MHz 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).

12

Channel

Selection

LR-100 Programming

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

Setup VU Meter

1

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

2

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

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

3

See Listen SQ™ on page 15. 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

4

Select the most appropriate channel by pressing the UP or DOWN button (see Channel Selection on page 16).
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

5

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.

Channel Selection

Programming

13

cations

Squelch Adjustment

Squelch

6

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:
Turn the transmitter OFF.

Listen to the receiver audio on the speaker or headphone. Turn the audio level down in the beginning.
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.

Now adjust the squelch setting counter clockwise until it squelches (mutes). This is the minimum

squelch setting.

Now turn the transmitter on. Adjust the squelch setting counter clockwise until the unit squelches. This is the

maximum squelch threshold. Please note that if you are close to the transmitter, you may not be able to find
the maximum squelch threshold due to the high RF signal of the transmitter.

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.

Specifi cations

Programming

14

Channel

Selection

Listen SQ™ - Improving Your Listening Experience

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:

You are using your new Listen system with older version Listen equipment

that does not have the SQ function.

You are using your new Listen system with equipment supplied by other

manufacturers.

You expect that end users may bring and use their own receivers that

don’t have the SQ function.

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

Programming

15

cations

Channel Selection

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 72 MHz and channels that start with a “2” for 216 MHz). 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:

Same Space. If you are using transmitters in the same space, the most number of channels

that will work simultaneously is six at 72 MHz and three at 216 MHz. 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 19-20, 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 300 KHz. If there is no interference
the following channels are recommended: A, C, E, I, J, and H for 72 MHz and channels 2A, 2K
and 2V at 216 MHz.

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.

Specifi cations

Programming

Notes in regard to using 72 MHz and 216 MHz systems:

72 MHz 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.

216 MHz 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 216 MHz band due to channel 13, it is recommended that you switch to a
72 MHz system.

16

Channel

Selection

RF Reception Maximization Strategies

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:

When designing and installing your system, keep in mind that the location of both the

1

transmitting and receiving antennas is critical to maximizing signal strength.

Eliminate or minimize obstructions between the transmitting antenna and the receiving

2

antenna.

Minimize the distance between the transmitting and receiving antennas.

3

4

Move transmitting and receiving antennas away from metal objects.

5

Place the transmitting antenna as high as possible.

6

Orient both transmitting and receiving antennas vertically.

7

For 216 MHz 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 216 MHz models is too high, the audio will be distorted. This may

happen if you are within 40 feet of the LT-800-216 transmitter.

Resetting After an Overload Condition

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.

Channel Selection

Programming

17

cations

Coaxial Cable

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 216 MHz applications or greater
than 100 feet for 72 MHz 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 72
MHz, there is an average loss of 2 dB per 100 feet of cable and at 216 MHz an average* loss of
5 dB per 100 feet of cable. (A 3 dB 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, RG-58 and RG-8 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.

Specifi cations

Programming

18

Channel

Selection

72 MHz Compatibility Chart

Frequency

MHz

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) 2 A 72.1

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 B B B B B, (18 12) 6 C 72.3

72.3250 7 7 7 B7 (19, 3)

72.3500 (14) 7

72.3750 8 8 8 B8 (20, 15)

72.4000 NNNNN, (16) 8 D 72.4

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) 10 E 72.5

72.5250 11 11 11 C1 (24, 21)

72.5500 (22) 11

72.5750 12 12 12 C2 (25, 33)

72.6000 OOOOO, (24) 12 F 72.6

72.6250 13 13 13 O2 (26, 25)

72.6500 (26) 13

72.6750 14 14 14 4 (27)

72.7000 DDDDD, (28) 14 G 72.7

72.7250 15 15 15 D5 (29)

72.7500 (30) 15

72.7750 16 16 16 D6 (30, 31)

72.8000 PPPPP, (32) 16 H 72.8

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) 18 I 72.9

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 I I I I I, (38, 43) 21 O

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) 24 P

75.3250 39 39 39 J9 (55, 51)

75.3500 (52) 25

75.3750 40 40 40 J0 (45, 53)

75.4000 R R R R R, (54) 26

74.4250 21 21 21 R1 (46, 55)

75.4500 (56) 27

75.4750 22 22 22 R2 (47, 57)

75.5000 F F F F F, (48, 58) 28 J 75.5

75.5250 23 23 23 F3 (49, 59)

75.5500 (60) 29

75.5750 24 24 24 F4 (50, 61)

75.6000 S S S S S, (62) 30 K 75.6

75.6250 25 25 25 S5 (51, 63)

75.6500 (64) 31

75.6750 26 26 26 S6 (52, 65)

75.7000 G G G G G, (53, 66) 32 L 75.7

75.7250 27 27 27 G7 (54, 67)

75.7500 (68) 33

75.7750 28 28 28 G8 (55, 69)

75.8000 TTTTT, (70) 34 M 75.8

75.8250 29 29 29 T9 (56, 71)

75.8500 (72) 35

75.8750 30 30 30 T0 (57, 73)

75.9000 H H H H H, (58, 74) 36 N 75.9

75.9250 31 31 31 H1 (59, 75)

75.9500 (76) 37

75.9750 32 32 32 H2 (60, 77)

Listen

Phonic

Comtek Phonak Williams* Gentner Telex Drake

Ear

Channel Selection

Programming

*Parenthesis indicate T35 and T20 narrowband.
NOTE: Wideband frequencies in highlighted rows.

19

cations

216 Compatibility Chart

Specifi cations

Programming

Frequency

MHz

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
2161250 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

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

216.3125 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

Listen

Phonic

Ear

Comtek Phonak Williams Gentner CSI AVR

Speed

Light

NOTE: Wideband frequencies in

highlighted rows.

20

Information

LR-100 Troubleshooting

Troubleshooting

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 device that automatically
protects the unit 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 14).

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 (72 MHz or 216 MHz) 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 216 MHz 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 +12 VDC power on the rear terminal block.

If you are still having problems after checking the above items, call Listen for help. We are available from
8am to 5pm Mountain time, Monday through Friday, at 800.330.0891 or 801.233.8992, or you can e-mail us at
[e-mail]. Our full contact information is available on page 24 of this manual.

Information

Information

21

of

Contents

Compliance Notice & FCC Statement

Compliance Notice

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.

Information

22

Table of Contents

Information

Warranty & Contacting Listen

Warranty

Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-82, LT-700, LT-800, LR-100, LR-42,
LR-44, LR-300, LR-400, LR-500, LR-600) to be free from defects in workmanship and material under normal use and
conditions for the useful lifetime of the product from date of purchase.

Listen warrants its Stationary IR Radiators (LA-140) to be free from defects in workmanship and material under normal
use and conditions for three years from the date of purchase.

Listen warrants its Noise Canceling Microphone (LA-270) to be free from defects in workmanship and material under
normal use and conditions for one year from date of purchase.

All other products and accessories are warranted for 90 days from date of purchase.
This warranty is only available to the original end purchaser of the product and cannot be transferred. Warranty is

only valid if warranty card has been returned within 90 days of purchase. This warranty is void if damage occurred
because of misuse or if the product has been repaired or modifi ed by anyone other than a factory authorized
service technician. Warranty does not cover normal wear and tear on the product or any other physical damage
unless the damage was the result of a manufacturing defect. Listen is not liable for consequential damages due to
any failure of equipment to perform as intended. Listen shall bear no responsibility or obligation with respect to the
manner of use of any equipment sold by it. Listen specifi cally disclaims and negates any warranty of merchantability
or fi tness of use of such equipment including, without limitation, any warranty that the use of such equipment for any
purpose will comply with applicable laws and regulations. The terms of the warranty are governed by the laws of the
state of Utah.

In the fi rst ninety days after purchase, any defective product will be replaced with a new unit. After 90 days, Listen
will, at its own discretion either repair or replace transmitters and receivers with a new unit or a unit of similar type
and condition. Product that is not covered under warranty shall be repaired or replaced with a unit of similar type
and condition based on a fl at fee. Contact Listen for details.

This limited warranty, prices and the specifi cations of products are subject to change without notice.

Contacting Listen

If technical service is needed, please contact Listen. Pre-authorization is required before returning Listen products.
If products were damaged in shipment, please contact the carrier, then contact Listen for replacement or repair
requirements payable by the carrier.

Listen’s corporate headquarters are located in Salt Lake City, Utah U.S.A. and are open Monday through Friday, 8am
to 5pm Mountain Time.

14912 Heritagecrest Way
Bluffdale, Utah 84065-4818
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995

[e-mail]
www.listentech.com

North America
Fax

Information

Information

23

of

Contents

Optional Accessories

Antenna Accessories

Antenna Accessories

LA-122

Universal Antenna Kit

(72 MHz and 216 MHz)

The single solution for all of your
indoor remote antenna needs.
Includes: 72 and 216 MHz
components; flexible and rigid
dipoles and monopole radials;
hardware for multiple mounting
configurations; and 25 ft. (7.6 m) of
RG-58 coax cable.

LA-326

Universal Rack Mounting Kit

Includes components for single and dual

rack configuration and a security cover

LA-107

Ground Plane Remote

Antenna Kit for Rack Mount

Antenna (216 MHz)

(Remote Mount, outdoor)

LR-100 Rack Mount Accessories

LA-327

“L” Bracket Mounting Kit for

LT-800/LR-100/LT-82

Use to mount on any flat surface

LA-125/LA-126

(72 and 216 MHz)

LA-125 for 72 MHz

LA-126 for 216 MHz

Information

24

Table of Contents

Optional Accessories

LA-316

Expansion Speaker for

LR-600 and LR-100

Notes

25

Notes

26

Notes

27

Listen Technologies Corporation
14912 Heritagecrest Way
Bluffdale, Utah 84065-4818, U.S.A.
+1.801.233.8992
+1.800.330.0891
+1.801.233.8995

North America
Fax

www.listentech.com

© 2008 Listen Technologies Corporation

®

All Rights Reserved 081308