A square base can be from 8 to 15 meters long and can be configured to the shape of the
structure as necessary, to provide the best arrangement. The height of the supporting
poles should be 20 to 40 feet. Supporting poles should be as tall as possible to provide the
antenna with the greatest isolation from industrial noise generated by the building,
such as fluorescent lights and electrical motors. Loop antennas are also less suscepti-
ble to industrial RF noise generated by the building, because they are isolated from the
ground system of the building.
Loop wires are attached at one end on the high voltage active side of the coupler and on
the other end at the ground side of the coupler.
5
5..0
08
8 B
Ba
as
se
e L
La
ad
dd
de
er
r IIn
ns
stta
alllla
attiio
on
n
F
Fiig
gu
ur
re
e 5
5..0
09
9 B
Ba
as
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De
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oo
op
p
The delta loop antennas are ideally suited
to long range communications due to
their low angle. This configuration is
best for communications ranging from
500 to 5000 miles in the HF frequency
range of 4 to 22 MHz. Noise rejection is
excellent, as stated for the quad loop
antenna. Because the antenna system is
25
© 1998 SGC Inc
SG-230 Manual
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA
P.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: [email protected] Web site: http://www.sgcworld.com
Radiation
Base Delta Loop
Coupler
Coupler
up to 300 feet
up to 200 feet
Hot
GND
Base Ladder Installation
Control cable
RF cable
Balanced Line Feeders
300-600 Ohms