Listen LR 500 User manual

User’s Manual
LR-500 Programmable Display Receiver
LR-400 Display Receiver
LR-300 Receiver
Don’t miss a single sound. Listen.
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: [phone]
Toll Free (North America): 1.800.330.0891
Fax: [phone]
E-mail: [e-mail]
Listen®and the Listen logo are registered trademarks of Listen Technologies Corporation

Welcome to Listen!
i
Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to providing you
the highest quality products and prompt, efficient customer care. Our products are
manufactured in an ISO-9000 factory that has been independently certified to the
highest quality standards. We stand ready to answer any questions you might have
during installation or in the operation of our products. Should there be any
problems with your Listen products, we are ready to help you in any way we can.
Should you have any comments on how we might improve our products or our
service, we’re here to listen. Here’s how to reach us:
Telephone: [phone]
Fax: [phone]
Toll Free (North America): 1.800.330.0891
E-Mail: [email protected]
Web: www.ListenTech.com
Thank you... and enjoy your listening experience!
Best regards,
The Listen Team
Listen™ and the Listen Logo are registered trademarks of Listen Technologies Corporation.
Receivers_2004_06_08 © 2004 Listen Technologies Corporation. All Rights Reserved.

Table of Contents
1
LR-500 User’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
LR-500 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
LR-400 User’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
LR-400 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
LR-300 User’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
LR-300 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Supplementary Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Listen SQ™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
RF Reception Maximization Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
72 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
216 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Compliance Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Receivers Table of Contents

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3
User’s Manual
LR-500 Programmable Display Receiver
Don’t miss a single sound. Listen.
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: [phone]
Toll Free (North America): 1.800.330.0891
Fax: [phone]
E-mail: [e-mail]

4
LR-500 Introduction
· LR-500 (72MHz or 216MHz)
· Warranty Card
· Receiver User Manual
LR-500 Package Contents
72 MHz: LR-500-072
216 MHz: LR-500-216
Listen Part Number
See pages 70-71.
Optional Accessories

5
LR-500 Table of Contents
Architectural Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Operation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Programming Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Squelch Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Squelch Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Charging Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Wall Transformer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Supplementary Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Listen SQ™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
RF Reception Maximization Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
72 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
216 MHz Frequency Compatibility Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Compliance Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
LR-500 Table of Contents

6
LR-500 Specifications
LR-500 Specifications
Architectural Specifications
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 programmable to electronically lock out unneeded channels. The receiver shall be capable of seek-
ing channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63Hz
to 15KHz, ±3dB at 72MHz, or of 63Hz to 10kHz, ± 3dB at 216MHz. 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 indi-
cates channel, channel lock or lock status, battery level, low battery, battery charging, and RF signal strength. The
receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LR-500 is
specified.
Specifications
Specification LR-500-072 LR-500-216
RF Frequency Range 72.025 - 75.950 MHz 216.025 - 216.975 MHz
Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
Sensitivity
Frequency Accuracy
Antenna
Antenna Connector
Squelch
Compliance
System Frequency Response 63Hz - 15kHz (±3dB) 63Hz - 10kHz (±3dB)
System Signal to Noise Ratio
(A-weighted)
SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB
System Distortion
Output
Uses earphone cable
<2% total harmonic distortion (THD) at 80% deviation
.6uV typical, 1 uV maximum for 12dB SINAD
3.5mm connector
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedance 32 Ohms
** All system specifications are wireless end-to-end
± .005% stability 0° to 50°C (32° to 122° F)
Programmable in 20 steps
FCC Part 15, Industry Canada
RF
Audio
continued on next page

7
Set Up Controls
User Controls
Programming
LCD Display
LED
Battery Type
Battery Life (Listen batteries)
Battery Charging (NiMH only)
Power Supply Connector
Compliance
Dimensions
Unit Weight
Unit Weight with batteries
Shipping Weight
Door
Temperature - Operation
Temperature - Storage
Humidity
Volume, channel UP/DOWN, SEEK. All controls except volume are electronically lockable.
Indicates channel, RF signal strength, lock status, squelch, battey power level and channel
programming.
Fully automatic, 14 hours
-10° to 40°C (14° to 104° F)
-20° to 50°C (-4° to 122° F)
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 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
UL Listed
16mW maximum, impedance 32 Ohms
Two AA batteries, alkaline or NiMH
30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
0 to 95% relative humidity, non-condensing
Manually lockable. UP, DOWN and SEEK through door, other
controls behind door (see Controls above).
Indicators
Physical
3.0 in x 1.0 in x 5 in WxDxH (7.6cm x 2.5cm x 13.cm)
5.8 oz (164.4g)
2.3mm OD by 0.7mm ID, barrel type connector. 7.5VDC, center positive <250mA. Drop in
contact points for use with Listen charging cases.
3.9oz (111g)
Environmental
Programmable channel selection (see below), alkaline/NiMH batteries
and squelch, SQ enable/disable
Controls
1.0 lbs (453.6kg)
Power
LR-500 Specifications
LR-500 Specifications continued
Specification LR-500-072 LR-500-216

8
LR-500 Quick Reference
Quick Reference
LR-500 Front
3.5mm Input Jack
A Listen earpiece or headset
connects here.
LED - when lit, indicates
unit has power. ON/OFF & VOLUME control dial
Press and hold both buttons for 5 seconds
to enter PROGRAM mode. The PGM icon
will appear in the display. To exit PROGRAM,
let unit sit idle for 5 seconds.
Look & Listen™ display shows receive
level, channel, battery status, PROGRAM
mode, whether a channel is locked, and
whether a channel is locked out from
selection (PROGRAM mode). See close-
up on page 10.
Use UP and DOWN buttons to select a
channel. SEEK button allows the user
to change channels or to
lock on a channel
Adjustable Squelch:
The default factory preset for squelch
is 03.(See page 18 for Squelch
programming information)

9
LR-500 Quick Reference
Quick Reference
LR-500 Inside Access Door
Battery Select Switch - place in NiMH position ONLY if you
are using Nickel Metal Hydride batteries, otherwise, leave it
in the Alkaline position.
SQ Switch: shipped in the ON position, use a screwdriver
or pen to slide to the OFF position if needed. You should
turn SQ off if any of your receivers do not have SQ.
SQ Switch
Battery Select
Switch
3.5mm Input Jack
A Listen earpiece or headset
connects here.
LED indicators
· Steady Red: Normal operation
· Slow Flashing: Battery is low
· Slow Flashing while charging: Unit is charging
ON/OFF and VOLUME control dial -
rotate the dial counter-clockwise to
turn unit on and increase volume.
LR-500 Top of Unit

10
LR-500 Quick Reference
Quick Reference
LR-500 Look & Listen™ Display
Dots indicate the relative RF
signal strength. Indicates the currently
tuned channel
Indicates the unit is in PROGRAM mode.
To enter PROGRAM mode, press and hold
the UP and DOWN keys until the PGM icon
appears in the display. To exit PROGRAM
mode let unit sit idle for 5 seconds. See
page 16 for complete instructions. When the padlock is visible the unit is
locked on channel currently displayed.
Press and hold SEEK for 5 seconds to
unlock or lock.
L/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.
Battery level indicator. The indi-
cator flashes, along with the red
LED on top of the unit, to alert
you when the battery is low and
needs to be charged or
changed.
LR-500 Battery Indicator
All three segments showing:
The batteries are at 50% or
greater capacity.
One segment showing:
Your batteries less than 25% capacity. When
this segment begins flashing along with the
LED on top of the unit, you should immedi-
ately change your batteries or recharge them
(if using NiMH batteries).
Two segments showing:
The batteries are at 25-49%
capacity.

11
LR-500 Setup Instructions
LR-500 Setup Instructions
Remove the product
Remove outer packaging and plastic cover. Inspect for physical damage. If damage is aparent,
please contact Listen Technologies Corporation technical sup-
port for assistance. See page 69 for contact information.
Open the front access door
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 ¼ 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
See diagram on page 9. 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.
LockedUnlocked
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.

12
LR-500 Setup Instructions
LR-500 Setup Instructions continued
Set SQ switch
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 58 for more information on SQ.
Place Batteries in Unit
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).
NOTE: Listen uses 1800mAh (milli-Amp-hour) constant current NiMH
(Nickel Metal Hydride) batteries. These may be purchased from your Listen
dealer (ask for part number LA-362).
Battery
Select Switch SQ Select
Switch

13
LR-500 Setup Instructions
LR-500 Setup Instructions continued
Connect an Earphone or Headset
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
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)
See page 56 for complete channel selection information.
Set Squelch
See pages 17 and 18 for squelch and programming information.
Program Channels
see page 16.
Red LED will illuminate
when on
Turn volume knob
counterclockwise
to turn on
LCD display will
activate when on
Earphone/Headset jack

14
LR-500 Operation
LR-500 Operation Instructions
Make Sure the Unit is On
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 vol-
ume in your earphone!
Select a Channel
Select the channel to match the transmission channel by pressing the UP and DOWN buttons
on the receiver.
At 72MHz:
72MHz 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 216MHz:
216MHz 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 60-63) for specific frequencies and com-
patibility with other manufacturers.
Test the audio
If a transmitter is broadcasting on that channel, you will be able to hear the audio. If the sig-
nal is too weak, the audio will be muted (squelched).
NOTE: Listen
recommends the
use of wide band
transmitters.

15
LR-500 Operation
LR-500 Operation Instructions continued
Find an audio transmission using SEEK
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 clear-
est operating channel.
Adjust the volume control
Use the control dial on the top of the unit to adjust the volume to a comfortable
level.
To Lock into Only One Channel
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.
Padlock appears when locked
If locked, LED flashes on all
portable receivers when SEEK
button is pressed.

16
LR-500 Programming
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.
Enter the PROGRAM mode
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
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
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 program-
ming the unit and it automatically exits, press and hold the UP & DOWN buttons simultane-
ously for 5 seconds to re-enter the PROGRAM mode.
UP and DOWN buttons
on front of LR-500

17
LR-500 Squelch
LR-500 Squelch
Squelch
The purpose of squelch is to mute the audio output of your receiver when the signal from the trans-
mitter 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 dif-
ferent 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 set-
ting 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.

18
LR-500 Squelch
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.
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 58 for information on Listen SQ).
Squelch Programming Instructions