SGC 235 Smartuner Remote Antenna Tuner, 500W, 160-10M ATU
SGC 235 Smartuner Remote Antenna Tuner, 500W, 160-10M ATU

SGC 235 Smartuner Remote Antenna Tuner, 500W, 160-10M ATU

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Greyline Performance is pleased to offer SGC remote tuner. Smartuner HF ATU

SGC is Made in the USA, Smart, Strong, and Elegant. Truly high-end and rugged. The robust tuning range is worth a look and they are waterproof HF ATUs as well. 

A premium and preferred ATU pairing for the Greyline Antenna Systems.

Considered higher-end in quality, these ATUs are popular with various professional industries such as Marine, Aeronautical, and of course Amateur Radio operators too. One aspect to point out that sets it apart from other offerings on the market is the dual-ground protections. Its isolated RF and DC grounds allow for less RF or common mode current at the radio. Some might say then that it removes the need for RF Choking in addition. 

These outstanding remote antenna tuners can tune a wet noodle without breaking a sweat. Well, so some have reported. The RF and electrical ground is solid. Tuners are generally hard to get wrong. The quality of the inner parts is a step up from the low-cost-focused remote tuners that we see in magazines. Radio ops that desire the very best quality remote auto tuners Made in America, look closer at SGC.

You want quality, this is it. They are military-grade, Made in the USA, marine industry-rated, autotuners, and are highly recommended for use with Greyline HF vertical antennas, and stealth HOA Flagpole Antennas. Built to last. 


SG-235 Smartuner™


Smartuning at 500 Watts

The SG-235 will achieve perfect coupling of your 500 Watt HF-SSB and your antenna in mobile, marine or fixed base applications. It has a durable, waterproof ABS plastic case and shock mount option for extreme applications. With a sophisticated Pi-L network and over 1/2 million tuning combinations, the SG-235 is the smartest way to tune at 500 Watts.


HF Frequency Range:
Power Input Range:
Input Impedance Range:
DC Input Requirement:
DC Operating Range:
Input Current:
Average Tune Time:
Recurrent set time:
Memory Capacity:
Possible Tuning Combinations:
Antenna Length:

Operating Temperature:



Case Construction:
RF Control Cable:
Coaxial Cable:

1.8 to 30 MHz
3 to 500W (PEP*) and 200W (continuous)
45 to 55 ohms
Typical: Less than 2:1
+13.6 VDC (nominal)
+10 to 18 VDC
1.4 Amps
Typical: Less than 2 seconds
Typical: Less than 10 milliseconds
170 non-volatile locations
1/2 million
Minimum lengths: 50 feet(3.3 to 30 MHz)
300 feet(1.8 to 30 MHz)
Any position, ideal at antenna feed point
-35 to +70 degrees C
14.5L x 11.5W x 4.5H inches
8 pounds

Waterproof ABS plastic cover
9 foot 9 conductor
9 foot RG-58 coax with PL-259 
Shock Mount Option

*Initial tune on any frequency cannot exceed 200W.


Pro Tip: Add the DC/DC Coaxial Line Isolator to remote control the SGC RF tuning unit over your feedline coax. That means, no extra control cabling other than your coax to the antenna site.  




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