Listen Technologies LA-122 Manuale utente
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
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.
Here’s how to reach us:
+1.801.233.8992
+1.800.330.0891 North America
+1.801.233.8995 fax
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 • Soundfield • Tour Group • Conferencing
1
Specifications
Table of Contents Package Contents Setup Instructions Information
Package Contents 3
Architectural Specifications 4
Specifications 4
Setup Instructions 5
Dipole Antenna Mounting Options 8
Monopole Antenna Mounting Options 12
Optional Accessories 15
Troubleshooting 16
Compliance Notice/ FCC Statement 17
Warranty/ Contacting Listen 18
Notes 19
LA-122 Table of Contents
3
Package Contents
LA-122 Package Contents
Optional Accessories
LA-127 RG58 BNC Cable Connector
LA-128 RG8 BNC Cable Connector
LA-112 RG58 Coaxial Cable
LA-113 RG8 Low Loss Coaxial Cable
LA-390 RG8/50 Ohm Low Loss
Preassembled Cable
LA-391 RG58/50 Ohm Preassembled
Cable
Listen Part Number
LA-122 Universal Remote Antenna
LA-122 Contents
• Wall/Electrical Box Mounting Plate
• Mounting Bracket
• Antenna Module and 25 ft. (7.6 m) RG58 coaxial cable
with BNC Connectors
• Telescoping antennas (2 for both 72 and 216 MHz)
• Flexible antennas (2 for both 72 and 216 MHz)
• Ground Plane and Shorting Plate
• Mounting Hardware:
(4) #6-32 Machine Screws - used to mount to a single or
dual gang duplex box
(4) #8-32 Machine Screws - used to mount to a square or
hex junction or light box
(4) #8 Sheet Metal Screws - used to mount to metal or
wood, or for use with dry anchors
(4) Dry Anchors - used to mount to drywall, concrete, plas-
ter, brick, or masonry
(2) Hex Kep Nuts (#10-32) and one (1) Fiber Washer - used
for mounting flexible antennas to the Antenna Module,
and for grounding purposes Mounting Options
•Wall Mount (to your electrical box)
Direct Wall Mount
•Ceiling Mount
In-Wall or In-Ceiling Mount
Mast Mount
Use With:
LT-800-072 Stationary Transmitter
LT-800-216 Stationary Transmitter
LT-803-072 Stationary 3-Channel FM Transmitter (72 MHz)
LR-100-072 Stationary Receiver/Power Amplifier
LR-100-216 Stationary Receiver/Power Amplifier
LR-600-072 Wireless FM Receiver/Speaker (72MHz)
LR-600-216 Wireless FM Receiver/Speaker (216MHz)
Mounting Bracket
Grounding Base
Antenna Module
Telescoping Antennas 72 MHz
Wall/Electrical Box
Mounting Plate
Shorting Plate
Telescoping Antennas 216 MHz
Flexible Antennas 216 MHz
Flexible Antennas 72 MHz
Machine Screw Dry Anchors Tapping Screws Hex Kep Nut Fiber Washer
4
Specifications
LA-122 Specifications
Architectural Specifications
The Universal Antenna Kit shall be capable of operating from 72.0 to 76.0 MHz with a center
frequency of 73.5 MHz and from 216.0 to 217.0 MHz with a center frequency of 216.5 MHz. The
kit shall include the necessary mounting hardware to mount the antenna on a single or dual
electrical box, directly on a wall, on a ceiling electrical box or on a flat surface. The antenna
shall have a BNC connector and the kit shall come with 25 ft. (7.6 m) of RG58 coax with BNC
connectors. The kit shall include rigid and flexible antenna radials. The Listen LA-122 Universal
Antenna Kit is specified.
Specication
Specications are subject to change without notication
Specifications LA-122
Center Frequencies 73.50 MHz and 216.50 MHz
Antenna Types Monopole and Dipole
Antenna Segment Lengths (same for both rigid and flexible antennas) 72 MHz: 39.25
in (1.0 m); 216 MHz: 12.25 in. (31.1 cm)
Antenna Gain Unity
Dipole Vertical Clearance 72 MHz: 79.75 in. (2.03 m); 216 MHz: 25.75 in.
(65.4 cm)
Connector Standard BNC
Coax Provided 25 ft. (7.6 m) RG58 with BNC connectors
Mounting Options
Wall mount, dual and single electrical box, ceiling
electrical box, horizontal surface mount (such as on top
of a rack), ceiling/ inverse mounting, flexible mounting
in-wall or in-ceiling and mast or conduit mount
Mounting Hardware
Provided. Includes self-tapping sheet metal screws,
drywall anchors, and all hardware required to mount to
electrical boxes. Does not include hardware required to
mount to a mast (available at most hardware stores)
Mounting Bracket Dimensions 4.5 in. (11 cm) wide x 7.0 in. (18 cm) deep x 2.5 in.
(6.4 cm) high
Mounting Plate Dimensions 4.48 in. (11.4 cm) x 4.55 in. (11.6 cm)
Shipping Box Dimensions 2.76 in. (70 mm) x 16.3 in. (415 mm) x 17.1 in. (435 mm)
Weight 4.4 lbs. (2 kg)
5
Setup Instructions
Important Things to Note Before Starting Your Installation
If you plan to use your own coaxial cable instead of the provided cable, you must use cable and
connectors rated at 50 ohms. Although cable used for cable TV installations looks similar to this
cable, it won’t work with your Listen system.
If you need to run cable over a greater length than 50 feet for 216 MHz applications or greater
than 100 feet for 72 MHz applications, we recommend that you use RG-8 cable rather than RG-58.
It is a lower loss cable, meaning that more of your signal will reach the antenna.
Long cable runs can result in signal degradation due to “loss” characteristics of the cable. At
72 MHz, there is a loss of 2 dB per 100 feet of cable and at 216 MHz, there is a loss of 5 dB per 100
feet of cable. (A 3dB loss means half of your power has been lost.) However, it is better to suffer
coaxial power loss than to try to shoot your signal through obstacles! Obstacles, especially metal,
can create drop-outs or reflections of your signal that will result in poor listening conditions.
Coaxial Cable
Please carefully compare the contents of your kit with the list found on page
2 of this manual. If any items are missing or damaged, please contact Listen
Technologies. If items were damaged in shipment, contact your carrier
immediately and retain all packaging for inspection by your carrier. Listen
is not responsible for shipping damage.
Listen Technologies Corporation
14912 Heritagecrest Way
Salt Lake City, Utah 84065-4818 U.S.A.
801.233.8992
800.330.0891 North America
801.233.8995 fax
www.listentech.com
Before Starting Assembly of Your Antenna
6
Setup Instructions
Important Things to Note Before Starting
Antenna Orientation
The antenna’s pattern is hemispherical, meaning that it has an “active” side and a ground side. The
active side directs the signal toward the receivers, so it is essential that the active side be oriented
toward the area where the receivers will be used. The Antenna Module’s ground side has the word
“GROUND” molded into the plastic.
See Diagram A. If it is necessary to locate an antenna low on a wall, the ground side should face
down. If you are mounting a monopole antenna in a ceiling or high on a wall, the ground side
should face UP. It may be necessary to move the ground side of the antenna mount around in
order to accomplish this.
To move the ground side of the module, simply remove the four nuts, reverse the module so that the
ground side is facing the bracket, then re-attach the nuts. Be careful to not detach any wires if the
module opens while it is not secured to the bracket.
Ground side of antenna
Ground side of antenna
This is the area of coverage
This is the area of coverage
Scenario 2 - Antenna is
mounted high in the facility
Scenario 1 - Antenna is
mounted low in the facility
Diagram A. Antenna coverage patterns. In Scenario 1, the antenna is mounted low in the facility. The
GROUND side of the antenna (marked on the module) should face down. In Scenario 2, the antenna is
mounted high in the facility. The GROUND side of the antenna should face up.
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