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SG-237

This antenna coupler has quickly become a very popular, low cost antenna coupler for all applications.  It is ideal for use with most amateur transceivers.  And, at 1/5th the size of a SG-230, finding a mounting location is much easier.

Priced less than the SG-230, the SG-237 is the economical alternative to SGC's famous SG-230 Antenna Tuner/Coupler.

Its frequency range extends to 60 MHz, and it is rated at 100 Watts maximum input.  (It should not be used with 150 watt output, marine transceivers.)

 

Part No.

Description (Click to view & order)

Price

sgcsg237

$
Supplied complete with:
  • Owner's Manual
  • SG-237 Coupler
  • 9' Cable RF/Control

Specifications

Feature Specification
HF Frequency Range 1.8 to 60 MHz
Power Input Range 3 to 100 watts (PEP) —40 watts max. on CW
Number of channels unlimited
Number of revolving memory locations 168
Input Impedance Range 45 to 55 ohms
VSWR (Typical) Typically less than 1.4:1
DC Input Requirement +13.8 VDC (nominal)
DC Operating Range +10.5 to 18 VDC
Input Current Average: 300 milli amps
Random set time Typical: less than 2 seconds
Recurrent set time Typical: less than 10 milliseconds
Antenna Length Minimum length of 7 ft. —3.5 to 60 MHz
Minimum length of 23 ft. —1.8 to 60 MHz
Installation Any position
Operating Temperature -35° to +70°C
Dimensions 9 x 7 x 1.5 inches
Weight 2 Lbs.
Case Construction ABS plastic cover on an anodized aluminum base
Control Cable Shielded 4 conductor RG-58 coax with PL-259 connector
Control Cable Length 9 feet
Antenna types 1. Whip; 2. Backstay (marine, sail); 3. Dipole centerfed; 4. Dipole with feedline; 5. Loop (small) 2x2 multi turn; 6. Loop (large) 10 ft. and up single turn; 7. Longwire; 8. Ladder feed
Marine Mounting
The Smartuner should be located inside the house or under the aft lazaret on a sailboat. The preferred installation if vertical, is with the RF screw pointing upward.  RF and DC cables are provided for on the lower edge of the weather housing, along with a 1/4-20 stainless steel ground stud. The antenna connects to the screw on the top of the weather housing.  The SG-237 may be mounted in any position including inverted without any degradation of performance.

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