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Designed by David Cripe, NMØS
Click for larger image.
Kitted and Offered For Sale By The Four State QRP Group
This excellent random wire antenna tuner is the classic T-Match design which is known for wide matching range and smooth operation. Dave has added a nice wrinkle - the SWR indicater employs TWO leds, not the normally seen single red LED. A green one indicates output power with a red one indicating reflected power. The beauty of this arrangement is that the operator sees the output power peaking as the SWR goes down, just like a power meter with dual meters - very intuitive. This makes tuning easier and leaves no doubt that it's tuned for maximum power output. For a high SWR the red LED is at full brightness and the green LED is off. At 2:1 both are at equal brilliance. At 1:1 the green is full on and the red is off. The small size is perfect for portable operations. Add this dandy little tuner to your portable ops go bag, or use it at home. It's equally at home on a picnic table, in a tent or camper, as well as on the operating desk in your shack.
Specifications and Design Features
Wide tuning range: 80 meters thru 10 meters. Tested on EFHWs, 100', and other random wire lengths.
Maximum Power Throughput: tested at 10 Watts.
Low loss large toroid
Twelve taps for small inductance step selection.
Low insertion loss when matched.
Enclosure Size: 3"x3"x2".
Assembly Manual Latest pdf manual, a serious update by Chuck Carpenter, W5USJ Thanks Chuck.
Assembly Manual In Spanish Translation by Jon Iza EA2SN, thank you Jon.
Addendum to Assembly Manual correct LED name differences, an update by Chuck Carpenter, W5USJ Thanks Chuck.
Bill of Materials
Electronics 2000's Excellent Capacitor Identification Page Posted with permission.
Electronics 2000's Excellent Resistor Code Graphic Calculator Posted with permission.
The cost of this kit is $45, shipping is additional. The Paypal buttons below include
the shipping costs. Shipping will be via USPS Priority Mail with a tracking number.
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If paying by check or money order (US dollars only) please make it out to "Four State QRP Group" and send to:
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Four State QRP Group
Ron Potter AG1P
PO Box 1117
Fernley, NV 89408
The 4S-Tuner is carefully kitted and shipped by Steve Miller NØSM
Please direct shipment related questions to Steve
All proceeds are applied toward funding OzarkCon.   Thank you for supporting The Four State QRP Group.