SG-231 MANUAL
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
© 11/00 SGC, Inc.
P.O. Box 3526, 98009 Fax: (425) 746-6384 Tel: (425) 746-6310
E-Mail: [email protected] Website: www.sgcworld.com
2
• A coupler
installed at the antenna
eliminates feed line losses by providing a
proper match of the antenna to the feed line. The Smartuner is a true antenna
coupler.
The several key points, which we will emphasize throughout this manual, will result in
the best possible operation of your Smartuner. These include:
• The coupler must be located
at the antenna
.
• No coax may be connected to the coupler output.
• The coupler must have clean +12 VDC power supplied to it.
• The ground system must always be
larger
than the antenna.
• The antenna wire should be of the largest gauge practical.
• Capacitance at the coupler output must be minimal.
• The antenna should be of sufficient length for your lowest operating frequency.
Strictly observing these basic rules will insure good operations under the widest range
of conditions.
This manual should be thoroughly studied if you plan to have the best possible signal
and most reliable operation of your HF system.
Please make note of the following information for your records:
Date unit was purchased: _____________________________________________
Dealer from whom Purchased: _________________________________________
Date Installed: ______________________________________________________
Type of Antenna used: _______________________________________________
1.3 Overall Description
The SG-231 is a general-purpose coupler that can operate with any type of radio and
almost any type of antenna configuration. The coupler network configuration is of a
pi
or
L
type; sensors continually monitor the state of the tuning and relay this information
to the processor.
The initial (first time) tuning may take several milliseconds to a few seconds depending
on the complexity of the tuning process for a specific antenna configuration. After
tuning the first time for a specific frequency and antenna, this information is entered in
the non-volatile computer memory that will store up to 170 tuning solutions.
When the same conditions are encountered again, re-tuning is accomplished within 20
milliseconds by recalling the information from the non-volatile memory. Special
software has been designed by SGC to allow accurate and fine-tuning of the coupler.
For software description, refer to the MicroTune
™
section of the manual.