Listen Technologies LR-300 User 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!

• Overall client satisfaction of working with Listen was rated 4.8 out of 5.

• “ Please continue with your excellent attitude toward customer satisfaction. You guys are great!”

• “I’ve never had such good service from any company. Keep up the good work!”

• “You stand behind your product wonderfully.”

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

Receivers Table of Contents

LR-500 Manual 3

LR-500 Table of Contents 5
LR-400 Manual 19
LR-400 Table of Contents 21

LR-300 Manual 33

LR-300 Table of Contents 35

Table of Contents

Supplementary Information 44

Channel Selection 44
Listen SQ™ 45
RF Reception Maximization Strategies 46
72 MHz Frequency Compatibility Table 47
216 MHz Frequency Compatibility Table 48
Troubleshooting 49
Compliance Notice 51
FCC Statement 51
Warranty 52
Contacting Listen 52
Optional Accessories 53

LR-500

LR-400

LR-300

Information

LR-500 Table of Contents

Package Contents 6
Architectural Specifi cations 7
Specifi cations 7
Quick Reference 7
Setup Instructions 9
Operation Instructions 11
Programming Instructions 13
Squelch Information 14
Squelch Programming 14
Charging Batteries 15
Wall Transformer Operation 16

LR-500

5

LR-500

LR-500 Package Contents

LR-500 Contents

• LR-500 Portable Programmable
Display FM Receiver (72 MHz,

216 MHz)

Listen Part Number

•LR-500-072 (72 MHz)

•LR-500-216 (216 MHz)

3

3

6

LR-500 Specifi cations

Architectural Specifi cations

The FM reciever shall be capable of receiving on 57 wide and narrow band channels with a SNR of
80dB or greater. The receiver shall be programmable to electronically lock out unneeded channels.
The receiver shall be capable of seeking channels. The device shall have an adjustable squelch. The
device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz, or 63 Hz to 10
KHz, ±3dB at 216 MHz. The device will incorporate a stereo headset jack that allows the user to plug
in either a mono or stereo headset. The device shall incorporate an LCD display that indicates
channel, channel lock or lock status, battery level, battery charging, and RF signal strength. The
receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The
Listen LR-500 is specifi ed.

Specifi cations

LR-500

RF

Audio

Controls

Indicators

Power

Physical

Environmental

RF Frequency Range 72.025-75.950 MHz 216.025-216.975 MHz

Specifi cation LR-500-072 LR-500-216

Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ± .005% stability 32 to 122º F (0 to 50º C)
Antenna Uses earphone cable
Antenna Connector 3.5 mm connector
Squelch Programmable in 20 steps
Compliance FCC Part 15, Industry Canada

System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 kHz (±3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB;

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

Set Up Controls

User Controls

Programming

LCD Display

LED

Battery Type
Battery Life (Listen batteries) 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only) Fully automatic, 14 hours

Power Supply Connector
Compliance UL Listed

Dimensions W x D x H
Unit Weight 3.9 oz. (111 g)
Unit Weight with batteries 5.8 oz. (164.4 g)
Shipping Weight 1.0 lbs. (453.6 kg)

Door

Temperature - Operation
Temperature - Storage -4 to 122º F (-20 to 50º C)
Humidity 0 to 95% relative humidity, non-condensing

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

SQ™ disabled: 60dB

3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms

Programmable channel selection (see below), alkaline/NiMH batteries and squelch,
SQ™ enable/disable

Volume, channel UP/DOWN/SEEK. All controls except volume are electronically
lockable

Unit can be programmed so that only desired channels are displayed. Squelch can be
adjusted for sensitivity and signal capture control. Channel selection can be locked by
holding the SEEK button for 5 seconds.

Indicates channel, RF signal strength, lock status, squelch, battery power level and
channel programming

Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg­ing. Flashes when locked and user attempts to seek to another channel.

Two AA batteries, alkaline or NiMH

2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA.
Drop in contact points for use with Listen charging cases

3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)

Manually lockable. UP, DOWN and SEEK through door, other controls behind door
(see Controls above)

14 to 104º F (10 to 40º C)

SQ™ enabled: 80dB;
SQ™ disabled: 50dB

7

LR-500 Quick Reference

Articulating Flexible Antenna:

Place in upright position when
in use.

3.5 mm Output Jack: Connect a Listen earphone(s) here.
LED: When lit, indicates unit has power. When batteries

are low or charging the LED fl ashes

On/Off and Volume Control Dial

Look&Listen™ Display:

Shows receive level, channel, programming,
battery status, and lock status.

LR-500

Power/Charging Port

Channel Select Buttons

Front Door Lock

SEEK Button: Allows the user to search for

or lock onto an active channel.

Battery Select Switch: Choose the type of
batteries being used - Alkaline or NiMH.

SQ™ Switch: Turns SQ™ On/Off.

Battery Compartment:

Place two (2) AA batteries in compartment.
Be sure to follow polarity pattern.

RF Receive Indicator:
Indicates the RF receive level.

PGM:
Program function is in process.

8

Channel Display: Displays the
channel the LR-500-863 is currently on.

L/O: Indicates while in programming
mode the specifi c channel has been
locked out.

Lock Icon: Indicates the unit is locked
on current channel.

Battery Level Indicator

LR-500 Setup Instructions

Remove the product

1

Remove outer packaging and plastic cover. Inspect for physical damage.
If damage is apparent, please contact Listen Technologies Corporation
technical support for assistance.

Open the front access door

2

If locked, use a pocketknife or small screwdriver to unlock the door locks
on both sides of the unit. To unlock the door, rotate the lock 1/4 turn
counterclockwise.

Grip the two tabs with your thumb and index finger and pull the door
downward. Do NOT place batteries in the unit yet.

Select Battery Type

3

You have two choices: NiMH and Alkaline. The unit is shipped with the switch
in the Alkaline position. Use a pen or small screwdriver to select the battery
type.

CAUTION: If you are using any battery type other than rechargeable Nickel

Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in
the alkaline position.

Unlocked

LR-500

Locked

WARNING: Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries. The NiMH position

will attempt to charge any batteries in the unit, even if they are not the proper type. Charging non-Nickel Metal Hydride (NiMH) batteries
will result in physical harm, destruction of property and/or fire.

Set SQ switch

4

The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is
shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to
the OFF position (to the right). See page 45 for more information on SQ.

Battery Select Switch

Place Batteries in Unit

5

Place two AA batteries in the compartment, making note of the battery polarity shown in the
battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position
for the batteries you are using. (ALK should be selected for all battery types other than NiMH).

SQ™ Select Switch

NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high

performance AA Nickel Metal Hydride batteries (part number LA-362). These may be
purchased from your Listen dealer.

9

LR-500

LR-500 Setup Instructions

Connect an Earphone or Headset

6

Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo
connectors may be used with a Listen receiver. Make certain you push the plug all the way
into the jack.

Turn the Unit On

7

Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of
the unit should activate and the LCD display should illuminate. If they do not, make sure you
have installed the batteries correctly and that you are using fully charged batteries.

Select Channel(s)

8

See page 44 for complete channel selection information.

Set Squelch

9

See pages 13 and 14 for squelch and programming information.

Program Channels

10

see page 13.

Earphone/Headset jack

LCD display will activate
when on

Red LED will illuminate when on

Turn volume knob counterclockwise to
turn on

10

LR-500 Operation Instructions

Make Sure the Unit is On

1

Rotate the volume knob counterclockwise with an earphone or headset connected to the unit.
Listen receivers use the cable of the earphone or headset as a receiving antenna.

Be careful when turning the unit on - if you turn the knob too far you might get too much
volume in your earphone!

Select a Channel

2

Select the channel to match the transmission channel by pressing the UP and DOWN buttons on
the receiver. Listen recommends the use of wide band channels.

At 72 MHz:

72 MHz receivers operate on 17 wide band channels and 40 narrow band channels.

Channels represented by letters on the display (i.e. A) are wideband channels;
channels represented by numbers are narrowband channels.

At 216 MHz:

216 MHz receivers operate on 19 wide band channels and 38 narrow band channels.

Channel numbers starting with a “2” are wide band; channels beginning with a “1” or “3”
are narrow band channels.

LR-500

Refer to the Frequency Compatibility Tables (pages 47-48) for specific frequencies and
compatibility with other manufacturers.

Test the audio

3

If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is
too weak, the audio will be muted (squelched).

Find an audio transmission using SEEK

4

Another way to find a channel on the LR-500 is to use the SEEK button. When you do this, the Listen
receiver looks for the next active channel. Sometimes the unit will mistake interference for a real
broadcast signal. If you get interference, press the SEEK button again. 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.

Adjust the volume control

5

Use the control dial on the top of the unit to adjust the volume to a comfortable level.

Volume Control Dial

11

LR-500

LR-500 Operation Instructions

To Lock into Only One Channel

6

Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned
channel. Press and hold the button again to unlock. When locked the LED on top of the unit
will flash when you press the SEEK button.

Is the Channel Locked on My Receiver?

On the LR-500, when the channel is locked, the padlock icon will appear on the display. If the
unit is locked, the red LED on the top of the unit will flash when you press the SEEK button.

If locked, LED fl ashes on all
portable receivers when SEEK
button is pressed

Padlock appears when locked

12

LR-500 Programming Instructions

The LR-500 Display Receiver has some special features not available in the other receivers: you may
lock out unwanted channels, and you can adjust the squelch in the unit.

Locking Out Unwanted Channels

For applications where users are required to select a channel (such as language interpretation or
classrooms), and you don’t want them to have to go through all 57 available channels to find the
appropriate channel, you can lock out all channels except the ones you are using in your facility.

UP and DOWN buttons on front of LR-500

Enter the PROGRAM mode

1

Press the UP and DOWN buttons simultaneously for 5 seconds, until the PGM symbol appears in the
display.

Use the UP and DOWN keys to select channels

2

As channels are displayed on the unit, those channels that are locked out from user access will be
indicated by the L/O (Locked Out) symbol. When a channel is locked out, the receiver will skip over
that channel when a user is tuning the receiver.

Press the SEEK button to toggle channels between locked out and non-locked out modes

3

LR-500

Exiting PROGRAM mode

To exit the PROGRAM mode, let the receiver sit idle (don’t press any buttons) for 5 seconds. The
receiver will automatically return to normal operation. If you haven’t finished programming the
unit and it automatically exits, press and hold the UP & DOWN buttons simultaneously for 5
seconds to re-enter the PROGRAM mode.

13

LR-500

LR-500 Squelch

Squelch

The purpose of squelch is to mute the audio output of your receiver when the
signal from the transmitter is turned off or is too weak to be received. Without squelch you
would hear radio noise in your earphone. The squelch on your receiver can be adjusted so that
it will mute the audio on different RF signal strengths. This is useful as follows:

• To ensure that users don’t hear transmissions from other transmitters, set the squelch setting to
the highest level that doesn’t squelch the receiver.

• If the receiver is going to be close to the transmitter (i.e. in a classroom), setting the squelch
setting high so that when the transmitter is turned off it immediately squelches and ignores
transmitters in other rooms.

• If you are in an area that has a lot of inference, you may want to set the squelch setting to a
high setting to ensure the interference is not picked by the receiver.

• If you need the maximum amount of range, you may want to consider setting the squelch
setting to a low level (0, 1 or 2).

CAUTION: When setting the squelch level low the reliability of squelch function is comprised.

This will cause radio noise to be heard in the earphone and there is a possibility of
hearing damage.

Squelch Programming Instructions

Squelch Programming

To enter Squelch programming mode

• Turn the unit off

• Press and hold the seek button; while still holding seek turn the ON/OFF dial to turn the
unit on.

• Release the seek button when the Listen name disappears and a two digit display is seen.

To adjust the Squelch level

• Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings.

• Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you
can have a longer range.

• Higher numbers mean that a more powerful signal with no noise will be heard, but you may
have a shorter range.

• Once the desired squelch setting is found, press “seek” to exit the squelch programming
mode.

Squelch setting 00 is no squelch; this effectively disables Squelching capabilities of the receiver.
Squelch setting 20 is maximum squelch sensitivity; you must have a very strong and stable RF
signal for the unit to not engage the squelch feature.

Adjusting the squelch setting will keep your LR-500 receiver from picking up noise when the
transmitter is not transmitting, or when you lose the signal by being out of range or if
encountering interference.

Note: For squelch settings 1-3, the squelch function is slow which allows for maximum

transmission range. For squelch settings 4-20 the squelch function is fast to ensure little
radio noise is heard during the squelch function.

(The Listen SQ™ feature is not squelch, please refer to page 45 for information on Listen SQ™).

14

LR-500 Charging Batteries

The LR-500 and all Listen receivers are unique because they have SmartCharge™ chargers built
in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen
charging case, NiMH batteries will be charged.

To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked

1

“PWR/CHG” on the side of the unit. The unit can be operated while the batteries are charging.

To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and

2

connect the charger to power. Make sure the unit is fully seated in its slot.
SmartCharge™ uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH)

batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger
to complete its full cycle every time for maximum battery life.

NOTE: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be

set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the
battery compartment) to the proper position.

Connect LA-202 here and plug into an
AC wall outlet

IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL

METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode
when connected to a charger. Other risks of charging non-NiMH batteries include
destruction of property or fire.

LR-500

During the charge cycle, the red LED on top of the Listen product will flash slowly. When
charging is completed, the LED will turn off. It is not necessary to unplug the charger; however,
if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge
cycle over again.

When not using the LR-500, it is recommended to leave the unit on the charger. The charger
provides a “maintenance” charge that keeps the battery at 100%. If the unit is not on the
charger, the battery will lose up to 20% of its charge
per month.

NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries.

These may be purchased from your Listen dealer (ask for part number LA-362).

15

LR-500

LR-500 Wall Transformer Operation

The LR-500 will operate normally when connected to a wall transformer. Use Listen part
number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on
the side of the LR-500 marked “PWR/CHG” and plug the wall transformer into a grounded
AC outlet.

You do not need to have batteries installed in the LR-500 to operate it with a wall transformer.

NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as

shown on page 9. Please review the information on page 15 for important information
regarding battery type and charging.

16

www.listentech.com

The LA-202 wall transformer plugs into the side
of your portable transmitter or receiver

LR-400 Table of Contents

Package Contents 22
Architectural Specifi cations 23
Specifi cations 23
Quick Reference 24
Setup Instructions 25
Operation Instructions 27
Squelch Information 29
Squelch Programming 29
Charging Batteries 30
Wall Transformer Operation 31

LR-400

21

LR-400 Package Contents

LR-400 Contents

• LR-400 Portable Display FM
Receiver (72 MHz, 216 MHz)

Listen Part Number

•LR-400-072 (72 MHz)

•LR-400-216 (216 MHz)

LR-400

22

LR-400 Specifi cations

Architectural Specifi cations

The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of
80dB or greater. The receiver shall be capable of seeking channels. The device shall have an
adjustable squelch. The device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at
72 MHz, or of 63 Hz to 10 kHz, ± 3dB at 216 MHz. The device will incorporate a stereo headset jack
that allows the user to plug in either a mono or stereo headset and listen to the audio normally. The
device shall incorporate an LCD display that indicates channel, battery level, low battery, battery
charging, RF signal strength and channel lock status. The receiver shall incorporate automatic
battery charging circuitry for recharging of NiMH batteries. The Listen LR-400 is specified.

Specifi cations

RF

Audio

Controls

Indicators

Power

Physical

Environmental

RF Frequency Range 72.025-75.950 MHz 216.025-216.975 MHz

Specifi cation LR-400-072 LR-400-216

Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ± .005% stability 32 to 122º F (0 to 50º C)
Antenna Uses earphone cable
Antenna Connector 3.5 mm connector
Squelch Programmable in 20 steps
Compliance FCC Part 15, Industry Canada

System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 kHz (±3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB;

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

Set Up Controls
User Controls

Programming

LCD Display
LED

Battery Type
Battery Life (Listen batteries) 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only) Fully automatic, 14 hours

Power Supply Connector
Compliance UL Listed

Dimensions W x D x H
Unit Weight 3.9 oz. (111 g)
Unit Weight with batteries 5.8 oz. (164.4 g)
Shipping Weight 1.0 lbs. (453.6 kg)
Door Manually lockable. UP, DOWN and SEEK protected by door

Temperature - Operation
Temperature - Storage -4 to 122º F (-20 to 50º C)
Humidity 0 to 95% relative humidity, non-condensing

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

SQ™ disabled: 60dB

3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms

Alkaline/NiMH batteries and SQ™ enable/disable and programmable squelch setting
Volume, channel UP/DOWN/SEEK (All controls except volume are electronically

lockable, and are behind the door)
Squelch can be adjusted for sensitivity and signal capture control. Channel selection

can be locked by holding the SEEK button for 5 seconds. Unit cannot be programmed
to seek only used channels, however, it is capable of entering squelch mode.

Indicates channel, RF signal strength, lock status, and squelch setting
Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg-

ing. Flashes when locked and user attempts to seek to another channel.

Two AA batteries, alkaline or NiMH

2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA.
Drop in contact points for use with Listen charging/carrying cases

3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)

14 to 104º F (10 to 40º C)

SQ™ enabled: 80dB;
SQ™ disabled: 50dB

LR-400

23

LR-400 Quick Reference

3.5 mm Output Jack: Connect a Listen earphone(s) here.
LED: When lit, indicates unit has power. When batteries

are low or charging the LED fl ashes

Power/Charging Port

On/Off and Volume Control Dial

Look&Listen™ Display:

Shows receive level, channel, programming,
battery status, and lock status.

SEEK Button: Allows the user to search for
or lock onto an active channel.

LR-400

Channel Select Buttons

Front Door Lock

Channel Display: Displays the

channel the LR-500-863 is currently on.

Battery Select Switch: Choose the type of
batteries being used - Alkaline or NiMH.

SQ™ Switch: Turns SQ™ On/Off.

Battery Compartment:

Place two (2) AA batteries in compartment.
Be sure to follow polarity pattern.

RF Receive Indicator:
Indicates the RF receive level.

24

Lock Icon: Indicates the unit is locked
on current channel.

Battery Level Indicator

LR-400 Setup Instructions

Remove the product

1

Remove outer packaging and plastic cover. Inspect for physical damage.
If damage is apparent, please contact Listen Technologies Corporation
technical support for assistance.

Open the front access door

2

If locked, use a pocketknife or small screwdriver to unlock the door locks
on both sides of the unit. To unlock the door, rotate the lock 1/4 turn
counterclockwise.

Grip the two tabs with your thumb and index finger and pull the door
downward. Do NOT place batteries in the unit yet.

Select Battery Type

3

You have two choices: NiMH and Alkaline. The unit is shipped with the switch
in the Alkaline position. Use a pen or small screwdriver to select the battery
type.

CAUTION: If you are using any battery type other than rechargeable Nickel

Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in
the alkaline position.

Unlocked

Locked

WARNING: Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries. The NiMH position

will attempt to charge any batteries in the unit, even if they are not the proper type. Charging non-Nickel Metal Hydride (NiMH) batteries
will result in physical harm, destruction of property and/or fire.

Set SQ switch

4

The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is
shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to
the OFF position (to the right). See page 45 for more information on SQ.

Battery Select Switch

Place Batteries in Unit

5

Place two AA batteries in the compartment, making note of the battery polarity shown in the
battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position
for the batteries you are using. (ALK should be selected for all battery types other than NiMH).

SQ™ Select Switch

LR-400

NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high

performance AA Nickel Metal Hydride batteries (part number LA-362). These may be
purchased from your Listen dealer.

25

LR-400 Setup Instructions

Connect an Earphone or Headset

6

Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo
connectors may be used with a Listen receiver. Make certain you push the plug all the way
into the jack.

Turn the Unit On

7

Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of
the unit should activate and the LCD display should illuminate. If they do not, make sure you
have installed the batteries correctly and that you are using fully charged batteries.

Select Channel(s)

8

See page 44 for complete channel selection information.

Set Squelch

9

See page 29 for squelch and programming information.

LR-400

Earphone/Headset jack

LCD display will activate
when on

Red LED will illuminate when on

Turn volume knob counterclockwise to
turn on

26

LR-400 Operation Instructions

Make Sure the Unit is On

1

Rotate the volume knob counterclockwise with an earphone or headset connected to the unit.
Listen receivers use the cable of the earphone or headset as a receiving antenna.

Be careful when turning the unit on - if you turn the knob too far you might get too much
volume in your earphone!

Select a Channel

2

Select the channel to match the transmission channel by pressing the UP and DOWN buttons on
the receiver. Listen recommends the use of wide band channels.

At 72 MHz:

72 MHz receivers operate on 17 wide band channels and 40 narrow band channels.

Channels represented by letters on the display (i.e. A) are wideband channels;
channels represented by numbers are narrowband channels.

At 216 MHz:

216 MHz receivers operate on 19 wide band channels and 38 narrow band channels.

Channel numbers starting with a “2” are wide band; channels beginning with a “1” or “3”
are narrow band channels.

Refer to the Frequency Compatibility Tables (pages 47-48) for specific frequencies and
compatibility with other manufacturers.

Test the audio

3

If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is
too weak, the audio will be muted (squelched).

Find an audio transmission using SEEK

4

Another way to find a channel on the LR-400 is to use the SEEK button. When you do this, the Listen
receiver looks for the next active channel. Sometimes the unit will mistake interference for a real
broadcast signal. If you get interference, press the SEEK button again. 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.

Adjust the volume control

5

Use the control dial on the top of the unit to adjust the volume to a comfortable level.

Volume Control Dial

LR-400

27

LR-400 Operation Instructions

To Lock into Only One Channel

6

Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned
channel. Press and hold the button again to unlock. When locked the LED on top of the unit
will flash when you press the SEEK button.

Is the Channel Locked on My Receiver?

On the LR-400, when the channel is locked, the padlock icon will appear on the display. If the
unit is locked, the red LED on the top of the unit will flash when you press the SEEK button.

If locked, LED fl ashes on all
portable receivers when SEEK
button is pressed

Padlock appears when locked

LR-400

28

LR-400 Squelch

Squelch

The purpose of squelch is to mute the audio output of your receiver when the
signal from the transmitter is turned off or is too weak to be received. Without squelch you
would hear radio noise in your earphone. The squelch on your receiver can be adjusted so that
it will mute the audio on different RF signal strengths. This is useful as follows:

• To ensure that users don’t hear transmissions from other transmitters, set the squelch setting to
the highest level that doesn’t squelch the receiver.

• If the receiver is going to be close to the transmitter (i.e. in a classroom), setting the squelch
setting high so that when the transmitter is turned off it immediately squelches and ignores
transmitters in other rooms.

• If you are in an area that has a lot of inference, you may want to set the squelch setting to a
high setting to ensure the interference is not picked by the receiver.

• If you need the maximum amount of range, you may want to consider setting the squelch
setting to a low level (0, 1 or 2).

CAUTION: When setting the squelch level low the reliability of squelch function is comprised.

This will cause radio noise to be heard in the earphone and there is a possibility of
hearing damage.

Squelch Programming Instructions

Squelch Programming

To enter Squelch programming mode

• Turn the unit off

• Press and hold the seek button; while still holding seek turn the ON/OFF dial to turn the
unit on.

• Release the seek button when the Listen name disappears and a two digit display is seen.

To adjust the Squelch level

• Use the Channel UP and DOWN buttons to raise or lower the squelch sensitivity settings.

• Lower numbers mean that a less powerful and possibly noisy signal will be heard, but you
can have a longer range.

• Higher numbers mean that a more powerful signal with no noise will be heard, but you may
have a shorter range.

• Once the desired squelch setting is found, press “seek” to exit the squelch programming
mode.

Squelch setting 00 is no squelch; this effectively disables Squelching capabilities of the receiver.
Squelch setting 20 is maximum squelch sensitivity; you must have a very strong and stable RF
signal for the unit to not engage the squelch feature.

Adjusting the squelch setting will keep your LR-500 receiver from picking up noise when the
transmitter is not transmitting, or when you lose the signal by being out of range or if
encountering interference.

Note: For squelch settings 1-3, the squelch function is slow which allows for maximum

transmission range. For squelch settings 4-20 the squelch function is fast to ensure little
radio noise is heard during the squelch function.

(The Listen SQ™ feature is not squelch, please refer to page 45 for information on Listen SQ™).

LR-400

29

LR-400 Charging Batteries

The LR-400 and all Listen receivers are unique because they have SmartCharge™ chargers built
in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen
charging case, NiMH batteries will be charged.

To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked

1

“PWR/CHG” on the side of the unit. The unit can be operated while the batteries are charging.

To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and

2

connect the charger to power. Make sure the unit is fully seated in its slot.
SmartCharge™ uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH)

batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger
to complete its full cycle every time for maximum battery life.

NOTE: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be

set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the
battery compartment) to the proper position.

Connect LA-202 here and plug into an
AC wall outlet

LR-400

IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL

METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode
when connected to a charger. Other risks of charging non-NiMH batteries include
destruction of property or fire.

During the charge cycle, the red LED on top of the Listen product will flash slowly. When
charging is completed, the LED will turn off. It is not necessary to unplug the charger; however,
if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge
cycle over again.

When not using the LR-400, it is recommended to leave the unit on the charger. The charger
provides a “maintenance” charge that keeps the battery at 100%. If the unit is not on the
charger, the battery will lose up to 20% of its charge
per month.

NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries.

These may be purchased from your Listen dealer (ask for part number LA-362).

30

LR-400 Wall Transformer Operation

The LR-400 will operate normally when connected to a wall transformer. Use Listen part
number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on
the side of the LR-400 marked “PWR/CHG” and plug the wall transformer into a grounded
AC outlet.

You do not need to have batteries installed in the LR-400 to operate it with a wall transformer.

NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as

shown on page 25. Please review the information on page 30 for important information
regarding battery type and charging.

www.listentech.com

The LA-202 wall transformer plugs into the side
of your portable transmitter or receiver

LR-400

31

LR-300 Table of Contents

Package Contents 36
Architectural Specifi cations 37
Specifi cations 37
Quick Reference 38
Setup Instructions 39
Operation Instructions 41
Charging Batteries 42
Wall Transformer Operation 43

35

LR-300

LR-300 Package Contents

LR-400 Contents

• LR-300 Portable Digital FM
Receiver(72 MHz or 216 MHz)

Listen Part Number

•LR-300-072 (72 MHz)

LR-300

36

LR-300 Specifi cations

Architectural Specifi cations

The FM receiver shall be capable of receiving on 17 wide band channels and have a SNR of 80dB
or greater. The receiver shall be capable of seeking channels. The device shall have a squelch. The
device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz. The device shall
incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset
and listen to audio normally. The receiver shall incorporate automatic battery charging circuitry for
recharging of NiMH batteries. The Listen LR-300 is specified.

Specifi cations

RF

Audio

Controls

Indicators LED

Power

Physical

Environmental

RF Frequency Range 72.025-75.950 MHz

Specifi cation LR-300-072

Number of Channels 17 (wide band)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ± .005% stability 32 to 122º F (0 to 50º C)
Antenna Uses earphone cable
Antenna Connector 3.5 mm connector
Squelch Automatic on loss of RF signal
Compliance FCC Part 15, Industry Canada

System Frequency Response 63 Hz-15 kHz (± 3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB; SQ™ disabled 60dB
System Distortion < 2% total harmonic distortion (THD) at 80% deviation

Output

Set Up Controls
User Controls
Programming

Battery Type
Battery Life (Listen batteries) 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only) Fully automatic, 14 hours

Power Supply Connector
Compliance UL Listed

Dimensions W x D x H
Unit Weight 3.9 oz. (111 g)
Unit Weight with batteries 5.8 oz. (164.4 g)
Shipping Weight 1.0 lbs. (453.6 kg)
Door Manually lockable. SEEK behind the door.

Temperature - Operation
Temperature - Storage -4 to 122º F (-20 to 50º C)
Humidity 0 to 95% relative humidity, non-condensing

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

3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms

Alkaline/NiMH batteries, SQ™ enable/disable
Volume, SEEK (Channel SEEK is electronically lockable)
Channel selection can be locked by holding the SEEK button for 5 seconds

Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg­ing. Flashes when locked and user attempts to seek to another channel.

Two AA batteries, alkaline or NiMH

2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA.
Drop in contact points for use with Listen charging cases

3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)

14 to 104º F (10 to 40º C)

LR-300

37

LR-300 Quick Reference

3.5 mm Output Jack: Connect a Listen earphone(s) here.
LED: When lit, indicates unit has power. When batteries

are low or charging the LED fl ashes

Power/Charging Port

On/Off and Volume Control Dial

SEEK Button: Allows the user to search for

or lock onto an active channel.

LR-300

Battery Select Switch: Choose the type of

batteries being used - Alkaline or NiMH.

Front Door Lock

SQ™ Switch: Turns SQ™ On/Off.

Battery Compartment:

Place two (2) AA batteries in compartment.
Be sure to follow polarity pattern.

38

LR-300 Setup Instructions

Remove the product

1

Remove outer packaging and plastic cover. Inspect for physical damage.
If damage is apparent, please contact Listen Technologies Corporation
technical support for assistance.

Open the front access door

2

If locked, use a pocketknife or small screwdriver to unlock the door locks
on both sides of the unit. To unlock the door, rotate the lock 1/4 turn
counterclockwise.

Grip the two tabs with your thumb and index finger and pull the door
downward. Do NOT place batteries in the unit yet.

Select Battery Type

3

You have two choices: NiMH and Alkaline. The unit is shipped with the switch
in the Alkaline position. Use a pen or small screwdriver to select the battery
type.

CAUTION: If you are using any battery type other than rechargeable Nickel

Metal Hydride (NiMH) batteries, make sure the BATTERY selection switch is in
the alkaline position.

Unlocked

Locked

WARNING: Do not place the BATTERY switch in the NiMH position if you are not using Nickel Metal Hydride Batteries. The NiMH position

will attempt to charge any batteries in the unit, even if they are not the proper type. Charging non-Nickel Metal Hydride (NiMH) batteries
will result in physical harm, destruction of property and/or fire.

Set SQ switch

4

The SQ switch is inside the battery compartment next to the Battery Select switch. The unit is
shipped with SQ in the ON position. To turn it off, use a small screwdriver or pen to slide the switch to
the OFF position (to the right). See page 45 for more information on SQ.

Battery Select Switch

Place Batteries in Unit

5

Place two AA batteries in the compartment, making note of the battery polarity shown in the
battery compartment, and again verifying that the BATTERY SELECT switch is in the correct position
for the batteries you are using. (ALK should be selected for all battery types other than NiMH).

SQ™ Select Switch

LR-300

NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high

performance AA Nickel Metal Hydride batteries (part number LA-362). These may be
purchased from your Listen dealer.

39

LR-300 Setup Instructions

Connect an Earphone or Headset

6

Your headset or earphone will connect to the jack on the top of the unit. Either mono or stereo
connectors may be used with a Listen receiver. Make certain you push the plug all the way
into the jack.

Turn the Unit On

7

Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of
the unit should activate and the LCD display should illuminate. If they do not, make sure you
have installed the batteries correctly and that you are using fully charged batteries.

LR-300

Earphone/Headset jack

Red LED will illuminate when on

Turn volume knob counterclockwise to
turn on

40

LR-300 Operation Instructions

Make Sure the Unit is On

1

Rotate the volume knob counterclockwise with an earphone or headset connected to the unit.
Listen receivers use the cable of the earphone or headset as a receiving antenna.

Be careful when turning the unit on - if you turn the knob too far you might get too much
volume in your earphone!

Test the audio

2

If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the signal is
too weak, the audio will be muted (squelched).

Find an audio transmission using SEEK

3

Another way to find a channel on the LR-300 is to use the SEEK button. When you do this, the Listen
receiver looks for the next active channel. Sometimes the unit will mistake interference for a real
broadcast signal. If you get interference, press the SEEK button again. 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.

Adjust the volume control

4

Use the control dial on the top of the unit to adjust the volume to a comfortable level.

Volume Control Dial

To Lock into Only One Channel

5

Press and hold the SEEK button for 5 seconds to lock a receiver onto the currently tuned
channel. Press and hold the button again to unlock. When locked the LED on top of the unit
will flash when you press the SEEK button.

IMPORTANT: Because the LR-300 has no LCD display, it is important to recognize when the unit

is locked on a channel. If the unit sounds distorted or there is no audio heard and
pressing the seek button does not correct the problem, the unit is probably locked
on the wrong channel. Press and hold the seek button for 5 seconds to unlock.

LR-300

If locked, LED fl ashes on all
portable receivers when SEEK
button is pressed

41

LR-300 Charging Batteries

The LR-300 and all Listen receivers are unique because they have SmartCharge™ chargers built
in. When any of these units are connected to an LA-202 wall transformer or dropped into a Listen
charging case, NiMH batteries will be charged.

To charge the batteries using the LA-202 wall transformer, plug the transformer into the jack marked

1

“PWR/CHG” on the side of the unit. The unit can be operated while the batteries are charging.

To charge the batteries using a drop-in charger, simply place the unit into a slot in the charger and

2

connect the charger to power. Make sure the unit is fully seated in its slot.
SmartCharge™ uses a pulse charging, which greatly extends the life of Nickel Metal Hydride (NiMH)

batteries. The entire charging process takes 13 hours. Listen recommends that you allow the charger
to complete its full cycle every time for maximum battery life.

NOTE: In order to charge NiMH batteries, the BATTERY SELECT switch in your Listen product must be

set to the NiMH setting. Use a pen or small screwdriver to move the switch (located in the
battery compartment) to the proper position.

Connect LA-202 here and plug into an
AC wall outlet

LR-300

IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY TYPE OF BATTERY OTHER THAN NiMH (NICKEL

METAL HYDRIDE) with your Listen equipment. Alkaline batteries may explode
when connected to a charger. Other risks of charging non-NiMH batteries include
destruction of property or fire.

During the charge cycle, the red LED on top of the Listen product will flash slowly. When
charging is completed, the LED will turn off. It is not necessary to unplug the charger; however,
if you unplug the unit from the charger and then plug it back in, it will begin the 13-hour charge
cycle over again.

When not using the LR-300, it is recommended to leave the unit on the charger. The charger
provides a “maintenance” charge that keeps the battery at 100%. If the unit is not on the
charger, the battery will lose up to 20% of its charge per month.

NOTE: Listen provides high performance constant current NiMH (Nickel Metal Hydride) batteries.

These may be purchased from your Listen dealer (ask for part number LA-362).

42

LR-300 Wall Transformer Operation

The LR-300 will operate normally when connected to a wall transformer. Use Listen part
number LA-202, available from any Listen dealer. Connect the wall transformer to the jack on
the side of the LR-300 marked “PWR/CHG” and plug the wall transformer into a grounded
AC outlet.

You do not need to have batteries installed in the LR-300 to operate it with a wall transformer.

NOTE: If batteries are in the unit ensure that the battery selection switch is set properly as

shown on page 39. Please review the information on page 42 for important information
regarding battery type and charging.

www.listentech.com

The LA-202 wall transformer plugs into the side
of your portable transmitter or receiver

LR-300

43

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 receivers, press and hold seek 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:

a. 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. Using the frequency
compatibility tables on pages 47-48, 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.

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 47-48) 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.

Information

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

ii. 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.

NOTE: The LR-300-072 can only be used with the 17 wide band 72 MHz channels, if you are using the

LR-300 choose only lettered wide band frequencies on your transmitter.

44

Listen SQ™

We are accustomed to listening to low noise, high fidelity audio (delivered via CD, DVD, etc.).
FM radio systems, such as those made by Listen, have more inherent noise compared to most
sound systems. To reduce noise of our systems, Listen now offers a noise reduction technology
called Listen SQ™. 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 manufacturers.

3. 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

45

Information

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 to maximize
this signal:

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

transmitter and receivers is critical to maximizing signal strength.
b. Eliminate or minimize obstructions between the transmitter and receivers.
c. Minimize the distance between the transmitter and receivers.
d. Move transmitter and receivers away from metal objects.
e. Place the transmitting antenna as high as possible (on stationary transmitters).
f. Orient both transmitting and receiving antennas vertically.
g. For 216 MHz stationary LT-800 transmitter only, consider using a gain antenna such as a Yagi type

antenna or the LA-107 ground plane antenna.
h. On portable transmitters and receivers, the cable from the microphone or headset is the

antenna; ensure that the cable is not coiled or laying horizontal.
CAUTION: When installing remote 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 (12m) of the LT-800-216 transmitter or within 5 feet (1.5 m) of the
LT-700-216 transmitter.

Coaxial cable, connectors, and optional antenna mounting kits are available from Listen.
Visit www.listentech.com or ask your dealer for details.

Information

46

J

)

K

72 MHz Compatibility Chart

KKK

K

B

Frequency

MHz Listen

72.0250 1 A1 1 1 (11, 1)

72.0500 (2) 1

72.0750 2 A2 2 2 (12, 3)

72.1000 A A A A A, (13, 4) 2 A 72.1

72.1250 3 A3 3 3 (14, 5)

72.1500 (6) 3

72.1750 4 A4 4 4 (15, 7)

72.2000

72.2250 5 K5 5 5 (16, 9)

72.2500 (10) 5

72.2750 6 K6 6 6 (17, 11)

72.3000 B B B B

72.3250 7 B7 7 7 (19, 13)

72.3500 (14) 7

72.3750 8 B8 8 8 (20, 15)

72.4000 N N N N N, (16) 8 D 72.4

72.4250 9 N9 9 9 (21, 17)

72.4500 (18) 9

72.4750 10 N0 10 10 (22, 19)

72.5000 C C C C

72.5250 11 C1 11 11 (24, 21)

72.5500 (22) 11

72.5750 12 C2 12 12 (25, 33)

72.6000 O O O O O, (24) 12 F 72.6

72.6250 13 O2 13 13 (26, 25)

72.6500 (26) 13

72.6750 14 4 14 14 (27)

72.7000 D D D D D, (28) 14 G 72.7

72.7250 15 D5 15 15 (29)

74.7500 (45) 22

74.7750 36 I6 36 36 (40, 46)

Frequency

MHz Listen

75.2250 37 I7 37 37 (41, 47)

75.2500 (48) 23

75.2750 38 I8 38 38 (42, 49)

75.3000 J J J J

75.3250 39 J9 39 39 (55, 51)

75.3500 (52) 25

75.3750 40 J0 40 40 (45, 53)

75.4000 R R R R R, (54) 26 Q

75.4250 21 R1 21 21 (46, 55)

75.4500 (56) 27

75.4750 22 R2 22 22 (47, 57)

75.5000 F F F F F, (48, 58

75.5250 23 F3 23 23 (49, 59)

75.5500 (60) 29

75.5750 24 F4 24 24 (50, 61)

75.6000 S S S S S, (62) 30

75.6250 25 S5 25 25 (51, 63)

75.6500 (64) 31

75.6750 26 S6 26 26 (52, 65)

75.7000 G G G G

75.7250 27 G7 27 27 (54, 67)

75.7500 (68) 33

75.7750 28 G8 28 28 (55, 69)

75.8000 T T T T T, (70) 34 M 75.8

75.8250 29 T9 29 29 (56, 71)

75.8500 (72) 35

75.8750 30 T0 30 30 (57, 73)

75.9000 H H H H

75.9250 31 H1 31 31 (59, 75)

75.9500 (76) 37

75.9750 32 H2 32 32 (60, 77)

Phonak

Microfield

Phonak

Microfield

Phonic

Ear Comtek Williams* Gentner Telex Drake

K, (8) 4 B 72.2

, (18, 12)6 C 72.3

, (23, 20)10 E 72.5

Phonic

Ear Comtek Williams* Gentner Telex Drake

, (43, 50)24 P

28 J 75.5

, (53, 66)32 L 75.7

, (58, 74)36 N 75.9

*Parenthesis indicate T35 and T20 narrowband.

NOTE: Wideband frequencies in highlighted

rows.

75.6

Information

47

216 MHz Compatibility Chart

K

K

K

L

L

L

K

L

Frequency

MHz Listen

216.0125 1A 1 1 C01 N01

216.0250 2A 41 41 1 1

216.0375 3A 2 2

216.0625 1B 21 3

216.0750 2B 42 42 2 10

216.0875 3B 4 4

216.1125 1C 5 5 C05

216.1250 2C 43 43 A 3 6

216.1375 3C 22 6

216.1625 1D 23 7

216.1750 2D 44 44 B 4 14

216.1875 3D 8 8

216.2125 1E 9 9 C09 N09

216.2250 2E 45 45 C 5 2

216.2375 3E 24 10

216.2625 1F 25 11

216.2750 2F 46 46 D 6 11

216.2875 3F 12 12 C12 N12

216.3125 1G 13 13

216.3250 2G 47 47 E 7 7

216.3375 3G 26 14

216.3625 1H 27 15

216.3750 2H 48 48 F 8 15

216.3875 3H 16 16 C18 N18

216.4125 1J 17 17 C21

216.4250 2J 49 49 G 9 18

216.4375 3J 18 18

216.5125 1

216.5250 2

Frequency

MHz Listen

216.5375 3

216.5625 1

216.5750 2

216.5875 3

216.6125 1M 65 25 C25

216.6250 2M 53 53 J 12 8

216.6375 3M 81 26

216.6625 1N 82 27

216.6750 2N 54 54

216.6875 3N 68 28

216.7125 1P 69 29 C29

216.7250 2P 55 55

216.7375 3P 83 30

216.7625 1R 84 31

216.7750 2R 56 56 15 4

216.7875 3R 72 32 C32 N72

216.8125 1S 73 33 C33

216.8250 2S 57 57 13

216.8375 3S 76 34

216.8625 1T 85 35

216.8750 2T 58 58 9

216.8875 3T 86 36

216.9125 1U 77 37 C37 N77

216.9250 2U 59 59 17

216.9375 3U 88 38

216.9625 1V 79 39 C39

216.9750 2V 60 60 5

216.9875 3V 80 40 C40 N80

Phonak

Microfield Comtek Williams Gentner CSI AVR

61 21
29 51 H 10 3

Phonak

Microfield Comtek Williams Gentner CSI AVR

62 22
28 23
52 52 I 11 12
64 24 C24 N64

13 16

14 19

Speed

Light

Speed

Light

NOTE: Wideband frequencies in highlighted

rows.

Information

48

Troubleshooting LR-300, LR-400, LR-500 Receivers

Troubleshooting

The receiver has no power.

Make sure the unit has either fully charged batteries or a Listen approved wall transformer

connected. Make sure the VOLUME knob has been rotated to the ON position. If this does not

work, try a different set of batteries. Make sure the batteries are installed properly.

There is no audio.

Make sure you have turned the volume control up. Make sure the earphone is plugged all the

way into the jack on the top of the unit. Make sure the transmitter is broadcasting an audio

source. Make sure you’re tuned to the same channel as the transmitter. If the RF signal is too

weak, the receiver will squelch and mute the audio source; move closer to the antenna or make

sure the transmitter’s output RF power switch is set on “FULL” (LT-800).

The audio is distorted.

Make sure you’re receiving on the correct channel. Make sure the audio on the

transmitter is not turned up too loud; this will cause distortion. Make sure the earphone

connector is pushed all the way into the jack on top of the unit. If you’re using the

LR-300, re-scan the channels to find the clearest channel. Make sure the SQ™ switch on your

transmitter and receivers is turned ON (or OFF, if some of your equipment is not SQ™ capable).

Make sure you are not too close to the transmitting antenna. If you can’t get farther away from

the antenna, turn down the RF output power on the stationary (LT-800) transmitter.

There is interference.

Try different frequencies on the transmitter and receivers until you find a clear channel. If this

does not work, try a different frequency band (i.e. if you are using 72 MHz, try 216 MHz or vice

versa). This is accomplished by returning the equipment to Listen (at no charge). Please contact

Listen technical support for assistance (see page 52 for information).

My LR-300 sounds distorted or there is no audio.

Because the LR-300 has no LCD display, it is important to recognize when the unit is locked on a

channel. If the unit sounds distorted or there is no audio heard and pressing the seek button does
not correct the problem, the unit is probably locked on the wrong channel. Press and hold the
seek button for 5 seconds to unlock.

I cannot pick up the signal on the receiver.

Check to make sure the receiver and the transmitter are on the same frequency and

channel. Also make sure the receiver is in broadcast range of the transmitter.

I can pick up the signal on the receiver, but it sounds like it’s not tuned in.

Check to make sure the transmitter and receiver are on exactly the same channel

number/letter. If you’re using the LR-300, re-scan the channels to find the clearest
channel by pressing SEEK.

I’m using another brand of transmitter - how do I tell which channel to use?

Refer to Listen’s Frequency Compatibility Tables (pages 47-48). Either adjust the transmitter or the

receiver to a common channel.

There is not sufficient range.

Make sure you are located as close as possible to the antenna of the transmitter. Try to place the

antenna as high as possible and free from obstacles. You can also check the squelch setting;
perhaps it is too sensitive. To change this setting, refer page 20 (LR-500) or to page 43 (LR-400).

Information

49

Troubleshooting

Troubleshooting

Users keep changing channels.

You can prevent users from changing channels by locking in the channel selection. This is done

by pressing and holding the SEEK button for 5 seconds. When the channel is locked, the padlock
icon will appear on the LR-400 and LR-500 displays. On the LR-300, the LED will flash when the
channel is locked and seek is pressed. In addition, you can lock the access doors to the units.

I cannot change channels when pressing the UP and DOWN buttons or the SEEK button.

The unit is locked. Press the SEEK button for 5 seconds to unlock.

When I change channels, only certain channels are accessible.

The unit has been programmed to tune to only certain channels (LR-500 only). You can change

these channel lock-out selections by re-programming the unit (see page 13).

My batteries are not charging.

Make sure the battery switch is in the NiMH setting and that you are using NiMH (Nickel Metal

Hydride) batteries. Make sure you are using only a Listen supplied charging unit or transformer.
Never try to charge alkaline or NICAD batteries.

I want to run the unit from a wall transformer.

Simply plug a Listen approved transformer (LA-202) to the CHG/PWR connector on the

side of the unit. Batteries do not need to be installed when operating the unit with a wall
transformer; however, if you have NiMH batteries installed and the BATTERY select switch is set to
NiMH, the batteries will charge while the unit is being used.

It’s confusing for users to have 57 choices when switching between channels.

Use the programming feature (only available in the LR-500) to limit the number of channels

accessible by users.

Information

50

Compliance Notice and FCC Statement

Compliance Notice

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

51

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.

Listen warrants its Charging/Carrying Cases (LA-306, LA-311, LA-313, LA-317, LA-318, LA-319, LA-320, LA-321, LA-322,
LA-323, LA-324, LA-325) 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 Bluffdale, 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

Listen Technologies GmbH
Jasminstr.16, 90522 Oberasbach, Germany
[phone]
[phone]
[e-mail]
www.listentech.de

Europe

Fax

Information

52

Optional Accessories

66

v

LA-164

Ear Speaker

LA-165

Stereo Headphones

Earphone Options

LA-161

Single Ear Bud

LA-166

LA-1

Neck Loop

LA-162

Stereo Ear Buds

LA-170

-

Behind-the-Head

Stereo Headphones

v

LA-265

Consumer

Camcorder Cable

Connector Options

LA-266

Professional

Camcorder Cable

LA-275

Sacrificial Cable

Information

53

Notes

54

Notes

55

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 081208