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The SGC Building, 13737 S.E. 26th St. Bellevue, Washington 98005 USA
P.O. Box 3526, 98009 Tel: (425) 746-6310 Fax: (425) 746-6384
© 1997 SGC Inc.
designed and tempered for this kind of service. If you mount an SG-303 on your Jeep, Land Rover or Humvee,
you'll appreciate it's ability to take all kinds of abuse.
The most crucial element of the antenna is something we haven't mentioned yet: The base insulator.
As you can imagine, the SG-230 antenna coupler will put out a lot of RF. As a matter of fact, at the right kind
of antenna condition, the SG-230 will put out more than 20 kV at 150 watts on some of the low bands with a highly
loaded antenna. This is why you don't want to use an off the shelf type antenna for high performance work. The
insulation will not hold up.
The insulation of the typical 102" stainless whip is in the range of 500 Volts. And we should mention that RF is
a lot different when it comes to breakdown than is DC! We have all sorts of insulation related considerations to look
at, including corona. At the kind of voltages which come with the SG-230, this is a design consideration. We use
some exceptional insulation around the base of the 303 which is designed for both high insulation and a high
leakage path.
If you are considering the SG-303, though, be clear that the antenna absolutely positively must use an antenna
coupler. The SG-303 was designed solely to be used with the SG-230 antenna coupler and lesser couplers would
likely not be able to handle the requirements of the antenna.
The SG-303 guarantee is a little unusual and bears some discussion. We have a standing
offer to replace an SG-303 if you can break it in the first 5 years of service under normal
conditions. And our idea of normal conditions is running around a desert in a Nissan Patrol
or driving trucks around the Tundra or APC around a contested capitol. As a testament to the SG-303's durability,
we haven't had to replace a single antenna!
First and foremost is the rugged construction. This is an antenna which will not break and it is rated to 70 MPH
and as we have mentioned, we have a 100% replacement guarantee for 5 years.
The wide frequency coverage is something you will not find elsewhere. You get complete frequency agility
with no wires to plug in, nor coils or hats to adjust. You simply pick your frequency, let your Smartuner™ learn the
antenna conditions, and you are on the air with a great signal.
The dual element construction insures that you not only get great performance at 14 MHz and higher, but you
also get great performance on the low bands where the helical element comes into its own.
The elements of the antenna are larger compared to what other manufacturers are using and for this reason,
transmission losses are kept to a minimum.
The rugged design
and full band
coverage provides
easy mobile use.
SG-303 FEATURES & BENEFITS
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