AAREFF SYSTEMS LIMITED (UK) © 2011 - email
- web www.aareff.com
STACKED DIPOLE ANTENNA
! IMPORTANT ! PLEASE READ INSTRUCTIONS
The antenna is the most important part of the
transmission system and must be correctly installed
before proceeding further and before any
transmission equipment is connected.
Ideally this antenna should be mounted 20 meters high and clear of any surrounding objects to get
maximum range and more importantly to reduce risk of radio frequency radiation to personnel. When
mounted at 20 meters in height off ground and using 400 watts of transmitter power, power flux density
measurements made at ground level directly under the antenna show less than 1 W/m
2
. This figure will be
less at this systems transmitter power of 200 watts. Several European countries use a value for the
power flux density of 10 W/m
2
as a basis for considering whether or not an area is safe. The issue of
radio frequency radiation limits is a contentious one and work in this field is continuing worldwide.
UNDER NO CIRCUMSTANCES SHOULD THE ANTENNA BE MOUNTED AND USED AT GROUND LEVEL OR
WITHIN A FEW METERS OF PERSONNEL
.
ANTENNA PACKAGE CONTENTS CHECKLIST
1 x Dipole (YELLOW marked cable + 53 cm RG59 cable)
1 x Dipole (RED marked cable + 53 cm RG59 cable)
4 x 65cm radiator rods
4 x Bolt, wing nut and plastic spacer
1 x RF connector 3 way plastic junction box
2 x Mast fixing clamp
10 x Cable ties
TO ERECT THIS ANTENNA YOU WILL NEED TO PROVIDE
1. PVC insulation tape and/or Self Amalgamating Tape
2. Tape Measure with mm
3. 10mm and 13mm Spanner
4. A secure mounting mast with a diameter of 45-50mm and clear length of at least 4 meters for mounting
the dipoles to.
CONSTRUCTION
1. Mount the tuned dipoles to the mast using the clamps provided. It is IMPORTANT for correct operation
that the dimensions on the diagram opposite are followed as closely as possible. For the system to
work properly with maximum gain and to give full tuned bandwidth from 88-108 MHz, the following are
very important;
BOTH DIPOLES MUST BE DIRECTLY ABOVE EACH OTHER
BOTH ‘TERMINAL BOXES’ MUST BE FACING THE SAME WAY
DIPOLE WITH THE RED MARKED CABLE AT THE BOTTOM
2.
Mount the aluminium junction box with the three RF connectors using the tie wraps provided on the
mast between the dipoles as shown on the diagram. The aluminium junction box RF connectors need to
face down as shown in the diagram. This will shield any direct rain or snow from getting inside or
onto the connectors.
3.
Connect the main feeder cable from the transmitter to the CENTER connector of the aluminium junction
box.
4.
Connect the Top dipole to one of the OUTER connector the plastic junction box using the cable marked
in YELLOW. Connect the Bottom dipole to the remaining OUTER connector the plastic junction box using
the cable marked RED. There will be excess cable, simply coil this neatly and tape or tie it to the
mast (DO NOT CUT IT BACK AND REFIT THE PLUG). The cables marked with YELLOW and RED on each dipole
are critical phased lengths and must never be altered in length.
5.
Wrap PVC or Self Amalgamating tape tightly around and all over the plugs on the Splitter Box to
waterproof them.
6.
Securely fix the cables using PVC tape or large cable ties to the mast as shown in the diagram
opposite. Make sure the cables are not going to flap around in the wind.
7.
Make sure that all fixings are tight and are not going to work loose over time with wind.
