Installation manual

S G - 237 S mart un er ™ M anual
SGC, 13737 SE 26
th
Street Bellevue, WA 98005 USA • Ph: 425-746-6310, Fx: 425-746-6384, Email: [e-mail]
www.sgcworld.com
SGC RESERVES THE RIGHT TO CHANGE SPECIFICATIONS WITHOUT NOTICE
 Copyright SGC 2008
3
hand, SGC antenna couplers are not limited in their impedance ranges and will tune all types of
antennas, including end fed wires and whips. For the most efficient operation possible, install
your SGC coupler as close to the feedpoint of your antenna as physical limitations allow. See
section 4.0 for examples of ideal configurations. More information, including details of several
real installations and technical notes can be found on our website.
3.0 Outdoor Installation
The SG-237 antenna coupler’s waterproof case is designed to withstand the environmental
conditions encountered aboard ship when mounted on weather decks. The internal construction
is designed to withstand the shock and vibration of marine service. Corrosion resistant hardware
and passive alloys are employed throughout. We do not recommend opening the case unless it is
necessary. For 99% of installations, the factory settings for jumpers will be correct.
The coupler must be installed in an area not directly exposed. Excessive weather or exposure to
heat and sunlight can shorten the life of the unit. Although the SG-237 built very solidly, it is
good installation practice to provide additional protection from the elements. SGC makes the
following recommendations:
3.1 Marine Mounting
The Smartuner should be located inside the house or under the aft lazaret on a sailboat.
On powerboats, the coupler may be mounted outside, but an additional protective housing
is recommended. The preferred installation if vertical is with the RF stud pointing
upward. The antenna connects to the bolt on the top. The SG-237 may be mounted in
any position, including inverted without any degradation of performance.
3.2 Desert and High Temperature Installations
The Smartuner may be used in very hot climates on a continuous basis if installed in a
manner that protects it from direct sunlight.
3.3 Additional Weather Protection Installations
To protect the unit from direct exposure to sunlight, and to prevent heavy build-up of ice,
we recommend installing the Smartuner under additional protective housing. If you are
mounting it on a tower or in an extremely hot or cold climate, a plastic wastebasket (such
as those made by Rubbermaid™) makes an excellent weather cover and costs only a few
dollars.