Specifications

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: [phone] Tel: [phone]
E-Mail: [e-mail] Website: www.sgcworld.com
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Setting JP1 to the Yes position is recommended if you are using a radio for split band
communications, for scanning selective calling protocols, or for Automatic Link
Establishment (ALE). The default is: Tuning Out In Rcv: [no].
Jumper JP2 bypasses the coupler's memories. This means that each time the coupler is
used on a different frequency, it will re-tune rather than use previously stored
information. The default is: Tune From Memory: [yes].
MicroTune
™
Software
Copyright November-1991
8.0 Tuning Process and Options
The SG-231 MicroTune ™ Software is unique software which allows precise tuning of the
digitally controlled
pi and L network to tune a wide variety of antennas.
C
C
L1
50 ohms
Antenna
out
in
The versatile MicroTune
™ software offers its user these special functions:
1. The coupler is activated whenever forward power is present.
2. In addition to sampling VSWR to determine if the coupler should re-tune,
frequency comparison is employed. This causes the coupler to tune whenever
the transmit frequency changes independent of the VSWR reading.
3. Extensive tuning paths are used to test different antenna situations. The
initial tuning of a new frequency (or switched antenna) will require up to two
seconds. Any further tuning is accomplished in a matter of milliseconds if
jumper JP2 (Tune From Memory) is in its default position.
4. Facilities and algorithms are used which enable accurate tuning at the low
end of the frequency band—even on shorter antennas than previously possible.