Listen LR-300 User manual

Don't miss a single sound.
•
Exceptional audio quality! 80dB signal-to-noise ratio!
•
17 field tunable channels (unless electronically locked on
one channel).
•
SEEK button behind mechanically locking door, thus
discouraging end users from changing the channel selected.
•
Excellent for schools, language interpretation, museums,
and tour group applications where users do not change
channels
•
100 % Digital – Listen receivers are digitally-tuned so
transmission won’t drift; assurance that when you select
a channel, it stays on channel!
•
Built in SmartCharge™ won’t allow batteries to
overcharge! Charging circuitry is conveniently built into
Listen’s receivers; never worry about unplugging a
transformer at a certain time.
•
Transformer charging plug or for the ultimate in
convenience drop in charging contacts.
LR-300 Digital Receiver
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, UT 84070-2515 USA
Phone: [phone] or 1.800.330.0891
Fax: [phone]
Email: [e-mail]
The LR-300 Digital Receiver is a low
cost digital receiver. It has the
same exceptional audio quality
as Listen's full-featured receivers
and the same convenient
recharging options.
The LR-300 utilizes the 17 most
common wide band channels,
with a SEEK channel selection
button behind the door panel.
The LR-300 does not use an LCD,
but instead a multi-function LED.
LR-300-072
Specify Part
Number
Benefits User Applications
• ADA compliance
• language interpretation
• meeting rooms
• meeting monitoring
• auditory description
• fitness centers
• convention centers
• judges chambers
• training facilities
• houses of worship
• tours
• offices
• cinemas
• schools
• trade shows
• amphitheaters
• parks
• zoos
• and many more!
updated 06.17.04 Listen®and the Listen logo are registered trademarks of Listen Technologies Corporation

2
Don't miss a single sound. Phone: [phone] or 1.800.330.0891
Fax: [phone]
Email: [e-mail]
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, UT 84070-2515 USA
1. Line-level earphone jack (3.5mm) accepts either mono or stereo headsets. Receiver antenna is built into the earphone
cord, eliminating additional wires while maximizing receiver effectiveness.
2. Multifunction LED indicates power on, if batteries are low, and charging status.
3. Easy on/off volume control.
4. Manually lockable battery compartment door.
5. Exclusive belt clip “loop” prevents unit from slipping off belt or strap.
6. Charging plug port.
7. Digitally tuned with SEEK button behind manually lockable door. Electronically lock on channel by holding the SEEK
button down 5 seconds to prevent tampering.
8. Uses two AA batteries. Selectable to use either alkaline or Listen’s advanced NiMH Rechargeable AA Batteries.
SmartCharge™ incorporated into receiver makes sure each unit receives the most beneficial charge.
9. When enabled, SQ provides highest audio quality available in its product category. SQ can be disabled for compatibility
with other assistive listening equipment.
10. Contact points for Listen’s drop in charging cases.
updated 06.17.04
LR-300 Features
LR-300 Digital Receiver
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Don't miss a single sound. Phone: [phone] or 1.800.330.0891
Fax: [phone]
Email: [e-mail]
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, UT 84070-2515 USA
LR-300 Digital Receiver Accessories
Listen Technologies Corporation (Listen) warrants its receiver (LR-300) 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. All other
products and accessories are warranted for ninety 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 modified 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
specifically disclaims and negates any warranty of merchantability or fitness 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. Listen will only accept returned products with prepaid shipping and with a return authorization number.
To receive a return authorization number call 1.800.330.0891 or +1.801.233.8992. Please see www.ListenTech.com or
contact Listen for warranty details.
updated 06.17.04
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 50Hz to 15KHz, ± 3dB at 72MHz. 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.
Architectural Specifications
Earphones Connector Options
Single Ear Bud
LA-161
Stereo Headset
LA-165
Ear Speaker
LA-164
Neckloop
LA-166
Dual Ear Bud
LA-162
Consumer
Camcorder Cable
LA-265
Professional
Camcorder Cable
LA-266
Sacrificial Cable
LA-275
Warranty

Don't miss a single sound. Phone: [phone] or 1.800.330.0891
Fax: [phone]
Email: [e-mail]
Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, UT 84070-2515 USA
Specification LR-300-072
RF RF Frequency Range 72.025 - 75.950 MHz
Number of Channels 17 (wide band)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ± .005% stability 0° to 50°C (32° to 122° F)
Antenna Uses earphone cable
Antenna Connector 3.5mm connector
Squelch Automatic on loss of RF signal
Compliance FCC Part 15, Industry Canada
Audio
** All system specifications
System Frequency Response 63Hz - 15kHz (±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
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedence 32 Ohms
Controls Set Up Controls Alkaline/NiMH batteries, SQ enable/disable
User Controls Volume, SEEK (Channel SEEK is electronically lockable)
Programming
Channel selection can be locked by holding the
SEEK button for 5 seconds.
Indicators 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
2.3mm OD by 0.7mm ID, barrel type connector.
7.5VDC, center positive <250mA. Drop in contact points for use
with Listen charging cases.
Compliance UL Listed
Physical Dimensions 3.0 in x 1.0 in x 5 in WxDxH (7.6cm x 2.5cm x 13.cm)
Unit Weight 3.9oz (111g)
Unit Weight with batteries 5.8 oz (164.4g)
Shipping Weight 1.0 lbs (453.6kg)
Door Manually lockable. SEEK behind the door.
Environmental Temperature - Operation -10° to 40°C (14° to 104° F)
Temperature - Storage -20° to 50°C (-4° to 122° F)
Humidity 0 to 95% relative humitity, non-condensing
LR-300 Digital Receiver
updated 06.17.04
Photographs, CAD drawings, etc. available at www.ListenTech.com.