SGC Sg-237 Smarttuner Pretoria 200 Watt

SG-237 Smartuner

SG-237 Smartuner

SG-237 Smartuner Inside

SG-237 Smartuner Inside






Built to Last

The SG-237 is designed with high density surface mount components on a 4 layer PCB, providing high efficiency, reliability and performance. The PCB is mounted on a sturdy chassis plate which provides an excellent electrical and RF ground system. The unit is fully waterproof (under 2 ft of water for 24 hours). The case is weather resistant, high grade ABS plastic that is sealed at the factory.


Use for base, mobile, portable, marine or aviation.

The SG-237 is our most popular Smartuner. It’s Rugged construction and small size allow maximum flexibility. It has a 100W power rating and additional frequency coverage to 60MHz, matching it perfectly with the most popular HF transceivers. It will work with any balanced or unbalanced antenna including whips, backstays, dipoles, loops and longwires, and requires a minimum of only 28 feet of antenna for full coverage operation.


HF Frequency Range:
Power Input Range:
Input Impedance Range:
DC Input Requirement:
DC Operating Range:
Input Current:
Recurrent set time:
Memory Capacity:
Possible Tuning Combinations:
Antenna Length:
Operating Temperature:
Case Construction:
Control Cable:
Control Cable Length:
Buy it!

1.8 to 60 MHz
3 to 100W (PEP) and 40W (continuous)
45 to 55 ohms
Typical: Less than 2:1
+13.8 VDC (nominal)
+10.5 to 18 VDC
300 milli Amps
Typical: Less than 2 seconds
Typical: Less than 10 milliseconds
170 non-volatile locations
1/2 million
Minimum lengths: 7 feet (3.5 to 60 MHz) / 28 feet (1.8 to 60 MHz)
Any position, ideal at antenna feed point
-35 to +70 degrees C
9L x 7W x 1.85H inches
2 pounds
Waterproof ABS plastic cover on an anodized aluminum base
Shielded 4 conductor RG-58 coax with PL-259 connector
9 feet standard, custom to-order

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