Specifications

SMARTUNER MANUAL 7
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
© Nov2000 SGC, Inc. P.O. Box 3526, 98009 Fax: [phone] Tel: [phone]
E-Mail: [e-mail] Web Site: www.sgcworld.com
Smartuner mounted inside a plastic waste
basket to protect it from extreme heat and
heavy icing. This type of enclosure is widely
available in all countries.
Long wire antenna
1.6.4 Warranty Note
It is important to have protection from the elements as common weather conditions can
reach beyond the capabilities of the coupler. Although the SG-230 coupler is fully
waterproof and was created to withstand normal weather conditions, warranty will be
voided if left exposed directly to extreme weather such as snow, rain, and ice or prolonged
sun exposure. Even in milder climates, direct and constant sunlight can exceed the safe
operating temperature and can shorten the lifespan of your coupler.
1.7 Remote Installations
The SMARTUNER is supplied with 9 feet of cable standard. SGC has two standard lengths
of antenna extension cable available in the event you need to mount the cable farther than 9
feet from the transmitter. A 25-foot extension cable is available (SGC Part Number 54-65) as
is a 50-foot cable (SGC Part Number 54-66).
If you need to install the antenna coupler more than 50 feet from the transmitter site, up to
two extension cables may be used for a total of 75 or 100 feet. However, SGC does not
recommend installing the Smartuner more than 100 feet from the transmitter because two
losses must be considered.
• The first loss in long distance installations is normal attenuation of the radio signal
coming from the antenna to the radio via the coax. As you may be aware, the longer
the coaxial cable run, the higher the loss will be. The amount of loss is dependent on
frequency. At 2 MHz, the loss is approximately .5 dB, while at 30 MHz the loss in
100 feet of coaxial cable is over 2 dB. This means that a 100-watt transmitter would
actually deliver about 70 watts to the antenna after running through 100 feet of coax
at 30 MHz.
If you are seeking the utmost performance at 30 MHz and you cannot avoid a run of
100 feet, or longer, we recommend using a larger low loss type of coax such as RG-8