ADJUSTES
If there is a need for adjustments, make small adjustments to the drive element in 1 band at
a time, increasing if you want to lower the resonance frequency or decreasing if you want
to up the resonance frequency, as the adjustment of one band can interfere with the
adjustment of another band, always mark what you are doing and then put the same
measurement on the other side of the antenna.
Use a good meter that is reliable. Stay away from the antenna during measurements as your
body can cause an erroneous reading. A SWR of 2:1 or less is satisfactory and will not
decrease efficiency, if greater than 2:1, do a general check on measurements, position of
traps and connections.
The SWR check must be done with the antenna pointed upwards and preferably supported
on something insulating 50cm from the floor (it can be a wooden box, a chair, etc.
Measurements with the antenna close to the ground are wrong and will not hold up when
raising the antenna.
The ideal height for installation is ½ wave from the ground or buildings, if you do not have
this possibility, use ¼ wave or at least 1/8 wave, however the efficiency and bandwidth can
be changed.
Remember, biger antenna, lower frequency or smaller antenna, higher frequency.
Find the resonance point on the antenna (smallest SWR) and use this reminder to see if you
need to raise or lower the antenna to get the frequency you want as the center.
Raise the antenna and, if necessary, repeat the operations, the time invested in the
adjustments returns in quality of operation.
LIST OF COMPONENTS AND PARTS BY SECTION
REFLECTOR –(BLUE)
ALUMINUM PIPES 1 1/8” 1ª SECTION
ALUMINUM PIPES 1” 2ª SECTION
ALUMINUM PIPES 3/4” (FINAL)
