Epcom SD400-6 Guide

ANTENAS YAGUI UHF
ADJUSTMENT INSTRUCTIONS
SD400-6.
SD450-6.
SD450-9.
SD450-12.
SD470-6.
SD490-6.
SD500-3.
SD500-5.
SD500-6.
SD500-12.
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
Yagui,
6 elements,
6 elements,
9 elements,
12 elements,
6 elements,
6 elements,
3 elements,
5 elements,
6 elements,
12 elements,
400-430 MHz.
450-470 MHz.
450-470 MHz.
440-470 MHz.
470-490 MHz.
490-512 MHz.
490-520 MHz.
490-520 MHz.
490-520 MHz.
490-520 MHz.
Your Yagi antenna, UHF, has the pre-adjusted elements for the enre operang band according to the
model. Therefore, it only requires adjustment of the Gamma coupling in the following way:
1.- Start with the "Capacive Tube" inserted completely and the "Inducve Adjustment Plate" at a
distance of 10-12 cm from the center of the antenna. Support the antenna on a temporary mast of
more than 3 m and move away from any metallic object (roofs, vehicles, etc.) Place a wameter and
inject power through a 50 Ohms coaxial cable. This should not be greater than 20 m thick, RG-8 or
beer.
2.- Make different measurements of reflected power, moving the "Inducve Adjustment Plate" one
cenmeter out and reading in each step. It is necessary to leave the tube in its inial posion always
that is, fully introduced.
3.- Try to minimize the reflected power by making movements of 1/2 cm or less with the "Inducve
Adjustment Plate" and when it is convenient. You can also get a lile "Capacive Tube" (If you move
the capacive tube, do not move the adjustment plate simultaneously)
4.- The adjustment of the antenna ends when the lowest value of reflected power is obtained.
5.- Any quesons, call our Engineering Department at SYSCOM.

DETAIL A
CAPACITIVE
ADJUSTMENT
INDUCTIVE
ADJUSTMENT CONNECTOR SO-239
(CONNECTOR FOR PL-259)
GAMMA
COUPLING
DETAIL B
ELEMENT
AND BOOM
ASSEMBLY
BOOM MOUNT
WITH MAST
PREFERIBLE HORIZONTAL MOUNT
(FIXED RIGIDLY TO THE TOWER)
DETAIL A
DETAIL B
REFLECTOR
RADIATOR
DIRECTORS
1
1 2
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3