SGC Smartuner SG-230, Installation And Operation Manual, Page: 27 / 90

F Fiig gu ur re e 5 5..1 11 1 V Ve es ss se ell iin ns su ulla atte ed d b ba ac ck ks stta ay y
The insulated backstay antenna requires two porcelains isolators. The coupler
must be placed as close as possible to the base of the backstay antenna. Proper
grounding of the coupler is very important. Connect the RF ground terminal
of the coupler to all metal parts or structures of the boat (keel, engine, etc.).
5 5..1 1 A AP PA AR RT TM ME EN NT T L LO OO OP P A AN NT TE EN NN NA A
Loop antennas can be used very effectively in small apartments, offices and
holding rooms. Radiation for a loop antenna is always efficient but highly
directive. Therefore, the orientation of the loop is very important. Generally,
the vertical loop antenna with horizontal radiation is much preferred for a
general application throughout the 1.8 to 30 MHz band. However, loop anten-
nas can be very effective when mounted horizontally to the ground to radiate
vertically and provide efficient short range communications on higher fre-
quencies. Generally HF connections are difficult to establish in the distance
range of 50 to 250 miles. In a large room (such as 20 x 30), we would recom-
mend the installation of a single wire loop antenna mounted on the ceiling
with the coupler against the wall directly below the antenna. The wire gauge
should not be less than 16 AWG with insulation.
When operation is for a small room, it is recommended that a small multiple
wire loop (6 loops) on a rectangular configuration 3 by 4 feet be installed (as
illustrated in the figure below).
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© 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: sgc@sgcworld.com Web site: http://www.sgcworld.com
Radiation
75 feet
Porcelain
isolator
Vessel
insulated
Backstay
Ground
connection
Porcelain
isolator
Coupler