Listen Technologies LR-300 User manual

Dear Valued Customer,
Thank you for choosing Listen! All of us at Listen are dedicated to
provide you with the highest quality products available. We take
great pride in their outstanding performance because we care
that you are completely satisfied. 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, efficient 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.
801.233.8992
800.330.0891 North America
801.233.8995 fax
[email protected]
www.listentech.com
Thank you... and enjoy your listening experience!
Best regards,
The Listen Team

Table of Contents LR-500 LR-400 LR-300 Information
Receivers Table of Contents
LR-500 User’s Manual 3
LR-500 Table of Contents 7
LR-400 User’s Manual 27
LR-400 Table of Contents 31
LR-300 User’s Manual 51
LR-300 Table of Contents 55
Supplementary Information 71
Channel Selection 73
Listen SQ™ 75
RF Reception Maximization Strategies 76
72 MHz Frequency Compatibility Table 77
216 MHz Frequency Compatibility Table 79
Optional Accessories 81
Troubleshooting 83
Compliance Notice 86
FCC Statement 87
Warranty 88
Contacting Listen 89

3

5
LR-500
Optional Accessories
See pages 81-82
Contents
• LR-500 (72 MHz or 216 MHz)
• Warranty Card
• Receiver User Manual
LR-500 Package
Part Number
72 MHz: LR-500-072
216 MHz: LR-500-216

LR-500 Table of Contents
Architectural Specications 9
Specications 9
Quick Reference 11
Setup Instructions 14
Operation Instructions 17
Programming Instructions 19
Squelch Information 20
Squelch Programming 21
Charging Batteries 22
Wall Transformer Operation 24
Supplementary Information 71
Channel Selection 73
Listen SQ™ 75
RF Reception Maximization Strategies 76
72 MHz Frequency Compatibility Table 77
216 MHz Frequency Compatibility Table 79
Optional Accessories 81
Troubleshooting 83
Compliance Notice 86
FCC Statement 87
Warranty 88
Contacting Listen 89
LR-500

9
LR-500
continued on next page
LR-500 Specications
Architectural Speci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 specied.
Specications
Specication LR-500-072 LR-500-216
RF
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 .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
** All system specications are wireless end-to-end
Audio
System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 kHz (±3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB;
SQ™ disabled: 60dB
SQ™ enabled: 80dB;
SQ™ disabled: 50dB
System Distortion < 2% total harmonic distortion (THD) at 80% deviation
Output 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms

10
LR-500
LR-500 Specications
Specication LR-500-072 LR-500-216
Controls
Set Up Controls Programmable channel selection (see below), alkaline/NiMH batteries and squelch, SQ™
enable/disable
User Controls Volume, channel UP/DOWN/SEEK. All controls except volume are electronically
lockable
Programming
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.
Indicators
LCD Display Indicates channel, RF signal strength, lock status, squelch, battery power level and
channel programming
LED 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.
Power
Battery Type Two AA batteries, alkaline or NiMH
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 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
Compliance UL Listed
Physical
Dimensions W x D x H 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)
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 through door, other controls behind door
(see Controls above)
Environmental
Temperature - Operation 14 to 104º F (10 to 40º C)
Temperature - Storage -4 to 122º F (-20 to 50º C)
Humidity 0 to 95% relative humidity, non-condensing

11
LR-500
3.5mm Input Jack:
A Listen earpiece or headset
connects here.
LED: When lit, indicates
unit has power.
On/Off and 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 13.
Up and Down Buttons: Use to select a
channel and access program mode.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.
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 21 for Squelch programming
information).
LR-500 Quick Reference
LR-500 Front
www.listentech.com

12
LR-500
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
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.
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™.
LR-500 Quick Reference
LR-500 Inside Access Door LR-500 Top of Unit

13
LR-500
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 19 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.
While in Program mode, the L/O 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.
The battery level indicator
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
immediately change your batteries or
recharge them (if using NiMH batteries).
Two segments showing:
The batteries are at 25-49%
capacity.
LR-500 Quick Reference
LR-500 Look&Listen™ Display
The battery level indicator
When the padlock is visible the unit is
Indicates the unit is in PROGRAM mode.

14
LR-500
Remove the product
Remove outer packaging and plastic cover. Inspect
for physical damage. If damage is apparent, please
contact Listen Technologies Corporation technical
support for assistance. See page 89 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 12. 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.
Locked
Unlocked
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.
LR-500 Setup Instructions
1
2
3

15
LR-500
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.
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 75 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. (Alkaline should be selected for all
battery types other than NiMH).
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.
Battery Select Switch
SQ™ Select Switch
LR-500 Setup Instructions
4
5
Battery Select Switch
SQ™ Select Switch

16
LR-500
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 73 for complete channel
selection information.
Set Squelch
See pages 20 and 21 for squelch and programming
information.
Program Channels
see page 19.
LCD display will
activate when on
Red LED will illuminate
when on
Earphone/Headset jack
LR-500 Setup Instructions
Your headset or earphone will connect to the jack on the top of the unit. Either
6
7
Select Channel(s)
See page 73 for complete channel
8
Set Squelch
See pages 20 and 21 for squelch and programming
9
Program Channels
see page 19.
10
www.listentech.com
Turn volume knob
counterclockwise
to turn on
Earphone/Headset jack
Red LED will illuminate
Turn volume knob
activate when on