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Mount to a Metal Surface Using the Ground Plane and Shorting Plate
See Diagram J
Ground Plane | Screws from Antenna Module |
|
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 care- fully 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 Mod- ule (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 ele- ment to the Antenna Module. Systems on 72 MHz will use the LONGER antenna; sys- tems 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 con- nectors rated at 50 Ohms.
Ground side of
Antenna Module
Shorting Plate
Nuts from ground side of Antenna Module
Hex Kep nut
Diagram J. A reversed Antenna Module with Ground Plane
and Shorting Plate.
Ground Plane
Shorting Plate
Sheet metal screws
Hex Kep Nut
Metal Equipment Rack
Diagram K. Mounting a Monopole on a metal surface.
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