9:1 Impedance Matching Network

for an End Fed Random Wire Antenna

Workshop Build-A-Thon

Saturday, March 2, 2024

9:00 am – 11:00 am

Ham Radio Outlet Training Room
(5710 W Good Hope Road, Milwaukee)

A simple to pack, simple to use portable antenna: operates on any band with this impedance matching transformer, a pre-determined length of random wire, and an antenna tuner. Great for portable use and HF EMCOMMS, The 9:1 impedance matching network acts as a transformer between your 50 ohm coaxial feedline and your random length wire. An antenna tuner smooths out the SWR. If the wire is cut for 84 feet with a 17 foot counterpoise, it will operate effortlessly from 80 meters through 10 meters.


Parts list and build instructions

Please bring your soldering kit and basic tools. A soldering station will be provided if you don’t have one. Safety glasses is required. Please reserve your seat for this workshop – 20 maximum attendees. Walk-ins accepted as space allows for club members and their guest.