SG-237 Specifications
HF Frequency Range: 1.8-60 MHz
Power Input Range: 3-100 W (PEP)
40 W CW Max (40% duty cycle)
Input Impedance Range: 45-55 Ohms
VSWR (Typical): Less than 1.4:1
DC Input Requirement: +13.8 VDC (nominal)
Average Input Current: 300 mA
Initial Tune Time: Less than 2 sec. (typical)
Retune from Memory: Less than 10 msec. (typical)
Memory Bins: 170
Tuning Combinations: ½ Million
Antenna Length (>3.3 MHz): 8 feet (2.5 M) minimum
Antenna Length (<3.3 MHz): 28 (8.5 M) feet minimum
Installation: Any Position
Operating Temperature: -35 to +70 C (-31 to +158 F)
Case: Weatherproof ABS plastic with aluminum base
Cable: 9 foot shielded 4-conductor/RG-58 coax
(PL-259 connector)
Dimensions: 9”L x 7”W x 1.5”H (23L x 18W x 4H cm)
2 Lbs. (1 Kg)
1.0 The Coupler Basics
Congratulations on purchasing the most versatile and reliable HF coupler available on the market
today. Your SGC Smartuner™ is designed to give you dependable operation and the flexibility
to operate on any HF frequency without any extra ‘tuning’ effort on your part. Unlike a
traditional ‘tuner’ – there are no knobs or buttons to fiddle with. You simply install the unit, and
operate – the Smartuner does the rest! Once the unit is installed, it will automatically sense your
RF frequency and tune your antenna down to minimum SWR to maximize the efficiency of your
signal and squeeze the most out of every watt. A Smartuner doesn’t require any special interface
or balun and will work with any transceiver and any antenna within its specifications range.
Installation is simple too! Read on to get on the air quickly and easily.
There are three connections on the SG-237 case: (1) The coaxial RF cable and power cables
(bundled together) that will connect to your transceiver and power supply. (2) The antenna
output connection. (3) The RF ground connection. All that is necessary to begin using your
coupler is to supply power, hook up to antenna, ground, and transceiver – and transmit. The SG-
237 does the rest.
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