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 entire operating band according to the
model. Therefore, it only requires adjustment of the Gamma coupling in the following way:
1.- Start with the "Capacitive Tube" inserted completely and the "Inductive 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 wattmeter and
inject power through a 50 Ohms coaxial cable. This should not be greater than 20 m thick, RG-8 or
better.
2.- Make different measurements of reflected power, moving the "Inductive Adjustment Plate" one
centimeter out and reading in each step. It is necessary to leave the tube in its initial position always
that is, fully introduced.
3.- Try to minimize the reflected power by making movements of 1/2 cm or less with the "Inductive
Adjustment Plate" and when it is convenient. You can also get a little "Capacitive Tube" (If you move
the capacitive 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 questions, call our Engineering Department at SYSCOM.