User`s manual

7
7
Fixed site antennas are shipped unassembled. This section provides assembly instructions.
IN THIS CHAPTER
Antenna Mounting Location ........................................................................... 7
Single Band Antenna Installation .................................................................. 7
Two Band Antenna Installation .................................................................... 16
Three Band Antenna Installation ................................................................. 18
ANTENNA MOUNTING LOCATION
For optimum results it is necessary to mount the fixed site antenna as high as possible above
the average terrain. It is also required that the antenna be mounted at the top of any
metallic structure (tower) so that there is no metal in the antenna pattern. Do not mount the
antenna near any transmitting antenna. Serious damage can occur if large RF fields are
applied to the antenna. See the application note “In-band Interference from a Nearby
Transmitter” available on our web site www.dopsys.com for more information.
SINGLE BAND ANTENNA INSTALLATION
This section details the assembly of a single band fixed site antenna. The photographs are
for a VHF antenna but all the antennas use identical mounting hardware.
MOUNTING THE MAST TO THE ANTENNA
All of the antenna assemblies come with a bottom mast, an antenna frame, and antenna
elements.
 At the base of the antenna frame there are 5 longer screws protruding from the bottom
connector plate as shown in the photo below. Remove these screws and lockwashers. Do
not remove the 3 other screws.
Chapter
4
FIXED SITE ANTENNA ASSEMBLY