
20
and radiation efficiency will be only a few percent of a full sized antenna.
However, a special electrically long antenna such as the SG-303 9 ft. mobile
antenna overcomes much of the radiation problem.
4
4..2
2
W
Wh
hiip
p A
An
ntte
en
nn
na
as
s -- 2
2..5
5--3
3..0
0 m
me
ette
er
rs
s ((8
8--9
9 fftt))
This antenna is recommended only for vehicular mobile installations. The
short length will result in poorer performance when compared with the
longer antennas. A special high performance 9 foot antenna, the SG-303 and
the 7 foot SG-307, is manufactured by SGC specifically for this problem. The
SG-303 is SGC Part Number 55-27.
4
4..3
3
W
Wh
hiip
p A
An
ntte
en
nn
na
a -- 7
7..0
0 tto
o 8
8..5
5 M
Me
ette
er
r ((2
28
8 fftt))
This antenna is recommended for marine installation on smaller vessels. It
may also be used in base stations if there is no way of using a longer anten-
na. The SG-203 is this type of antenna. Order SGC Part Number 55-23.
4
4..4
4
L
L o
o n
n g
g w
w ii r
r e
e A
A n
n tt e
e n
n n
n a
a --
2
23
3 m
me
ette
er
r ((7
75
5 fftt)) a
an
nd
d 4
46
6 m
me
ette
er
r ((1
15
50
0 fftt))
For most applications the longwire antenna will give the best results and is
recommended when practical. The diagrams at the end of this section show
some recommended methods of installation. These are only a few of the
many possible methods of installation and frequently a different configura-
tion will be the best at a particular site. SGC's long wire antenna, 60 feet in
length, provides efficient operation on low frequencies and high frequen-
cies alike. Order SGC Part Number 55-10.
4
4..5
5
B
B a
ac
ck
k s
stt a
a y
y A
A n
ntt e
e n
nn
n a
as
s --
8
8 m
me
ette
er
rs
s ((2
28
8 fftt)) a
an
nd
d llo
on
ng
ge
er
r
Although we would love to sell everyone a high performance marine whip
antenna, the backstay of a sailboat is almost impossible to improve upon in
most installations.
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