Array Solutions - SAL12/20/30 - Mark II Manual – Rev. 1.5.1 – September, 2018
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Based on this, here are some things to keep in mind:
•
If the ground is uneven, try to mount the base of the loop at least 5 feet above the
ground. You will need additional mast pipe to accomplish this.
•
Keep antenna away from large metallic structures like towers, and your transmit
antennas. We recommend at least 1/4 Wavelength distance at the lowest
frequency of use.
•
If needed, to avoid damage by people, animals or vehicles you can elevate your
installation. Simulations show that optimal height is ¼ W.L. at a given frequency.
As an example of an AS-SAL-12 Mark II that has good directivity from 300 kHz to 28
MHz, it is located with the edge of the array located 50 feet (15.24 m) from a house, 90
feet (27.43 m) from overhead power lines, 30 feet (9.14 m) from ground mounted 36 foot
(10.97 m) vertical with ground radials close to the edge of the array, 10 feet (3.05 m)
from metal clothesline, and has an 8 foot (2.43 m) tall bush growing near the center.
Required Area
SAL-30 Mark II approximately a clear flat 50 feet (15.24 m) square.
SAL-20 Mark II approximately a clear flat 36 feet (10.97 m) square.
SAL-12 Mark II approximately a clear flat 26 feet (7.92 m) square.
NOTE:
If insulated posts are used to anchor the outer corners of the loop, the footprint
can be reduced notoriously. See table and drawing below for comparison.
