Listen Technologies UNIVERSAL ANTENNA KIT LA-122 - Manual (Page 17)

13
Setup Instructions
Monopole Antenna Mounting Options
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.
The Mounting Bracket is not used in this
configuration. Remove the four nuts and
screws from the Antenna Module and
carefully remove it from the bracket. With
a lockwasher still over each screw, put the
screws through the Ground Plane. Make
sure the ground side of the Antenna
Module (as indicated on the module) is
oriented AWAY from the Grounding Plane.
Then, slide the Shorting Plate over the ground
side (bottom) of the module. Replace the four
nuts on the bottom of the assembly. Then,
place a Hex Kep nut on the center ground
post and tighten.
Secure the Ground Plane to your metal rack
using sheet metal screws.
Attach the proper Monopole antenna
element to the Antenna Module. Systems on
72 MHz will use the LONGER antenna; systems
on 216 MHz will use the SHORTER one.
Connect the supplied coaxial cable between
the Antenna Module and the stationary
transmitter or receiver. If you use your own
coaxial cable, be sure to use cable and
connectors rated at 50 ohms.
Mount to a Metal Surface Using the Ground Plane and Shorting Plate
See Diagram J
Diagram K. Mounting a Monopole
on a metal surface.
Diagram J. A reversed Antenna Module
with Ground Plane and Shorting Plate
Flexible antenna is used
to provide ground
Hex Kep Nut
Nuts from ground side
of Antenna Module
Ground side of
Antenna Module
Screws from Antenna Module
Ground Plane
Ground side of
Antenna Module
Shorting Plate
Nuts from ground side
of Antenna Module
Hex Kep Nut
Metal Equipment Rack
Sheet metal
screws
Shorting Plate
Ground Plane
Hex Kep Nut