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
3
Wire antenna
SMARTUNER
Large Ground (counterpoise) system
10 feet (3 meters)
Diagram of Smartuner Installation
To Transmitter
(side view)
PL-259
Grey: SIG A
To SmartLock Pro
Grn:
Grn: Tuned
Blue: Reset
Brn: VHF
Wht: Hold
Black: DC Gnd
Red: 12-15 VDC
Control cable
RF cable
Orange: Option A
Violet: Option B
Not used
If antenna or transmitter conditions have changed since the information was stored in
memory, the coupler re-tunes and a new tuning solution is achieved. This new
information is stored to memory for future reference. The Smartuner will always look
for the
best possible tuning solution
and will improve existing tuning solutions whenever
possible.
The SG-231 may be bypassed and your antenna used as a broadband receiving antenna.
To do this, turn off the power to the coupler for two seconds and then turn it back on, or
simply press the reset button on the SmartLock Pro. In this situation, the coupler is
reset to stand-by waiting for the first RF power to be transmitted before providing a
tuning solution. In the stand-by mode, the antenna bypasses tuning elements and
connects the antenna directly to the receiver with no tuning elements engaged. This
allows for receiving signals throughout the HF range.
The coupler will cease to operate normally if input voltage drops below 10.5 VDC. This
situation may occur if a marginal battery is used or if you are transmitting at high
power with an inadequate power supply or battery. Batteries must be fully charged for
proper operation. Large gauge wiring to the transmitter and coupler must be used to
avoid re-tuning.
If broadband operation is required during scanning operations, jumper JP-1 on the
printed circuit board inside the coupler may be set to the “YES” mode. This will bypass
tuning elements on receive. Jumper JP-1 is located along the edge of the printed circuit
board near U2.
In some cases, it may be desirable to re-tune the coupler and bypass the memory
information. If you wish to bypass the recalled tuning solutions, place jumper JP-2, also
located near U2, to the “NO” position.
1.4 Coupler Network Configuration
The coupler network configuration is designed with 128 different input capacitor
values, 64 output capacitor values, and 512 inductor values, thus providing about a four