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7.
Metal fencing of any type. (A barbed wire fence along a pasture under
telephone pole?)
8.
100 feet of wire thrown in a river or sea. (Under a trestle?)
9.
Metal drain culverts. (Along a highway?)
10.
4-5 cars parked with their metal bumpers touching or a sheet metal
roof. (Hospital or public building.)
As you can see from this list, there are an almost limitless number of options
available for the trained professional to install a high performance antenna
system with only a small amount of wire and an SG-230 Smartuner.
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1.
The longer the antenna, the better the antenna performance. By
doubling the length of the antenna, an improvement of 3 - 6 dB can be
expected in your radiation or receiving characteristics. This is the
equivalent of transmitting with 400 watts, when in actuality you are
using only 100 watts.
2.
A ground for "end fed" antennas can be very effectively created by
running radial wires from the coupler point and laying them onto the
ground. It is recommended that for a good ground, 12 radials should be
used and they be about 1/3 larger than the antenna length. The
number of radials can be reduced; however, you need at least one.
Efficiency pattern and radiation will decrease in proportion.
3.
Antennas will always perform better if the wire is of a large gauge.
N e v e r u s e a n y t h i n g l e s s t h a n g a u g e 1 6 . I f g a u g e 6 i s u s e d , a n
improvement of 6 dB can be expected over the 16 gauge. The radial
ground wire should be at least the same size as of the antenna wire.
4.
The SG-230 coupler can handle antennas beyond the specified minimum
range of 8 to 80 feet and should be extended as much as possible. In
some cases, the antenna can be 300 feet or longer. In this situation, you
may find some tuning holes that are of no importance to the present
application. However, if this is not the case, the antenna can be made a
little shorter or longer to overcome the tuning hole on the frequency
band you may have wanted to use.
5.
Always install the antenna system as far away as possible from any
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
© 1998 SGC Inc
SG-230 Manual