User’s Manual LA-122 Universal Remote Antenna Kit Listen Technologies Corporation 8535 South 700 West, Suite A Sandy, Utah 84070-2515 USA Telephone: +1.801.233.8992 Toll-Free (USA): 1.800.330.0891 Fax: +1.801.233.8995 E-mail: info@listentech.com V.020603. Listen and the Listen logo are registered trademarks of Listen Technologies Corporation. Document #LM-122 Copyright © 2002 Listen Technologies Corporation. All Rights Reserved.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h .
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Table of Contents Contents of Kit ............................................................................... Specifications ................................................................................ Architectural Specifications .......................................................... Important Things to Note Before Starting .................................... Selecting an Antenna Location .......................................
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Important Things to Note Before Starting Your Installation Coaxial Cable 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.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m 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.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Selecting an Antenna L ocation Location The location and configuration of your antenna mount will determine the quality of your signal; therefore, there are some important factors to consider. º Where will the receivers be located? Ideally, the antenna will be centrally positioned above that area. º Where will the transmitter or stationary receiver / power amplifier be located? We recommend that it be located no more than 25 feet (7.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Dipole Antenna Mounting Options Mount to an Electrical Box in a Wall See Diagram B at right The antenna may be mounted to a single or dual gang duplex box, or to a square or hexagonal junction box. Attach the kit’s Mounting Plate to the electrical box (see photo, right). The cover plate has a number of holes and slots to accomodate a wide variety of electrical boxes.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Mounting Inside a Wall or Ceiling See Diagrams D and E The antenna may be hidden inside a wall or ceiling. IMPORTANT: Do not install the antenna inside a metal wall or ceiling, as this would obstruct the signal. You will use a flexible dipole (the floppy wires) in this configuration. Select the correct wires for your configuration (72 MHz or 216 MHz).
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Mounting to a Mast or Conduit The antenna may be mounted to a mast, pole or section of vertical conduit. A mast made of non-conductive material works best; however, if you must use a metal mast, be sure to orient the antenna mount so the mast is not between the antenna and the designated receiving area. The Mounting Plate is not required, but will provide a stronger mount for the antenna.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Connecting the Dipole Antenna You have two choices of antenna with the dipole option: the rigid dipole, which has the two extendable arms, or the flexible dipole, which has the “floppy” wires with securing rings at the ends. Rigid dipole pieces screw onto the connectors at the top and bottom of the Antenna Module. Flexible dipole wires are secured using Hex Kep nuts and a fiber washer as indicated on page 9.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Monopole Antenna Mounting Options Mount to a Grounded Electrical Box, Ceiling or Floor A monopole (single element) antenna may be mounted to a grounded light box or junction box in a ceiling or floor using the Mounting Plate and Mounting Bracket. BEFORE STARTING, reverse the Antenna Module on the Mounting Bracket, then install the Hex Kep nut on the ground post (see Diagram G at right).
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Mount to a Metal Surface Using the Ground Plane and Shorting Plate See Diagram J Ground Plane It is often convenient to place an antenna on top of a metal equipment rack. In order for the antenna to function properly, it must be secured to the equipment rack using the Grounding Plate and Grounding Base.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Mounting a Monopole Antenna to a Metal Beam or Metal Ceiling See Diagram K Follow the instructions for mounting to a metal equipment rack, orienting the antenna downward rather than upward. Mounting a Monopole Antenna to a Non-Conductive Surface See Diagram L Follow the instructions for mounting to a metal equipment rack, however, there are two additional steps: Diagram K. Inverse mounting of a monopole. 1.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Troubleshooting I’m not hearing anything in my receiver. 1. Make sure the receiver’s batteries aren’t dead, that it is turned on, set to the right channel, and the volume has been turned up. 2. Make sure your transmitter or stationary receiver has been powered up and set to the right channel, and the desired audio has been applied. 3.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m My signal is strong but it is distorted. 1. Make sure your transmitter or stationary receiver is on the same channel as the receivers. 2. Make sure you are not too close to the antenna. 3. Lower the level of the audio signal being fed into the transmitter. If you are still having problems after checking the above items, call Listen for help. We are available from 8 AM to 5 PM Mountain time, Monday through Friday, at 1.800.330.
R LA-122 Universal Antenna Kit w w w. L i s t e n Te c h . c o m Warranty Listen Offers a Limited Lifetime Warranty, Including a Performance Guarantee. Listen Technologies Corporation (Listen) warrants its transmitters and receivers (LT-700, LT-800, LR-100, LR-300, LR-400, LR-500, LR-600, etc.) 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.