User’s Manual
LR-500 Programmable Display Receiver
LR-400 Display Receiver
LR-300 Receiver
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: +1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: +1.801.233.8995
Don’t miss a single sound. Listen.
E-mail: info@ListenTech.com
Listen® and the Listen logo are registered trademarks of Listen Technologies Corporation
Receivers Table of Contents
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
1
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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: +1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: +1.801.233.8995
E-mail: [email protected]
3
LR-500 Package Contents
Listen Part Number
·
·
·
LR-500 (72MHz or 216MHz)
Warranty Card
Receiver User Manual
72 MHz: LR-500-072
216 MHz: LR-500-216
Optional Accessories
See pages 70-71.
4
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
5
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
RF Frequency Range
Number of Channels
Sensitivity
LR-500-072
72.025 - 75.950 MHz
57 (17 wide, 40 narrow)
LR-500-216
216.025 - 216.975 MHz
57 (19 wide, 38 narrow)
.6uV typical, 1 uV maximum for 12dB SINAD
.005% stability 0° to 50°C (32° to 122° F)
Uses earphone cable
Frequency Accuracy
Antenna
RF
3.5mm connector
Antenna Connector
Squelch
Programmable in 20 steps
FCC Part 15, Industry Canada
Compliance
** All system specifications are wireless end-to-end
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
Audio
<2% total harmonic distortion (THD) at 80% deviation
System Distortion
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedance 32 Ohms
Output
continued on next page
6
LR-500 Specifications continued
Specification
LR-500-072
LR-500-216
Programmable channel selection (see below), alkaline/NiMH batteries
and squelch, SQ enable/disable
Set Up Controls
Volume, channel UP/DOWN, SEEK. All controls except volume are electronically lockable.
User Controls
Programming
Controls
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.
Indicates channel, RF signal strength, lock status, squelch, battey power level and channel
programming.
Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charging.
LCD Display
LED
Indicators
Flashes when locked and user attempts to seek to another channel
Two AA batteries, alkaline or NiMH
30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Fully automatic, 14 hours
Battery Type
Battery Life (Listen batteries)
Battery Charging (NiMH only)
Power
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.
Power Supply Connector
Compliance
UL Listed
3.0 in x 1.0 in x 5 in WxDxH (7.6cm x 2.5cm x 13.cm)
Dimensions
3.9oz (111g)
5.8 oz (164.4g)
1.0 lbs (453.6kg)
Unit Weight
Unit Weight with batteries
Shipping Weight
Physical
Manually lockable. UP, DOWN and SEEK through door, other
controls behind door (see Controls above).
Door
-10° to 40°C (14° to 104° F)
-20° to 50°C (-4° to 122° F)
Temperature - Operation
Temperature - Storage
Humidity
Environmental
0 to 95% relative humidity, non-condensing
7
Quick Reference
LR-500 Front
LED - when lit, indicates
unit has power.
3.5mm Input Jack
A Listen earpiece or headset
connects here.
ON/OFF & VOLUME control dial
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.
Adjustable Squelch:
The default factory preset for squelch
is 03.(See page 18 for Squelch
programming information)
Use UP and DOWN buttons to select a
channel.
SEEK button allows the user
to change channels or to
lock on a channel
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.
8
Quick Reference
LR-500 Inside Access Door
LR-500 Top of Unit
SQ Switch
Battery Select
Switch
LED indicators
·
·
·
Steady Red: Normal operation
Slow Flashing: Battery is low
Slow Flashing while charging: Unit is charging
Battery Select Switch - place in NiMH position ONLY if you
are using Nickel Metal Hydride batteries, otherwise, leave it
in the Alkaline position.
ON/OFF and VOLUME control dial -
rotate the dial counter-clockwise to
turn unit on and increase volume.
3.5mm Input Jack
A Listen earpiece or headset
connects here.
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.
9
Quick Reference
LR-500 Look & Listen™ Display
Dots indicate the relative RF
signal strength.
Indicates the currently
tuned channel
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.
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.
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.
When the padlock is visible the unit is
locked on channel currently displayed.
Press and hold SEEK for 5 seconds to
unlock or lock.
LR-500 Battery Indicator
Two segments showing:
The batteries are at 25-49%
capacity.
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).
10
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.
Unlocked
Locked
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.
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.
11
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.
Battery
Select Switch
SQ Select
Switch
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).
12
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.
Red LED will illuminate
when on
Turn the Unit On
Earphone/Headset jack
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.
Turn volume knob
counterclockwise
to turn on
LCD display will
activate when on
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.
13
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.
NOTE: Listen
recommends the
use of wide band
transmitters.
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).
14
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