Four State QRP Group

Four State
Archives

4S-Tuner
Text size too large or small? Use your Ctrl key and scroll wheel to adjust it.

4S-Tuner/Antenna Coupler
Designed by David Cripe, NMØS
Click to join 4S-Tuner Group
Click to join the
4S-Tuner
Yahoo Group
JPEG Not Uploaded Yet
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".
    Pittsburg Construction.
Documentation
    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.
    Schematic
    Bill of Materials
    Photopage
    Elecraft's     Excellent Capacitor Identification Page  Posted with permission.
    Electronics 2000's     Excellent Resistor Code Graphic Calculator  Posted with permission.
Ordering Information:
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.
Pay With PAYPAL
Choose US, Canada, or DX Order
        Official PayPal Seal
If paying by check or money order (US dollars only) please make it out to "Four State QRP Group" and send to:
Four State QRP Group
Tom Brown WØMFQ
PO Box 627
St. Charles, MO 63302
The 4S-Tuner is carefully kitted and shipped by Bob Zolecki, KR9Z.
Please direct shipment related questions to Bob
All proceeds are applied toward funding OzarkCon.   Thank you for supporting The Four State QRP Group.

 
© Copyright 2006....2017 - Four State QRP Group

The files and images on this site unless otherwise noted are copyright by
the Four State QRP Group and may not be published or used without permission.