Monday, October 19, 2009

A simple, useful tuner for the venerable EFHW

KI6SN's November 2009 Trail-Friendly Radio column in WorldRadio Online magazine focused on a useful, popular and easy-to-manage HF field antenna: the EFHW - or End Fed Half Wave, with a counterpoise.

Above, you'll see the schematic for a simple EFHW tuner for the popular 40- and 20-meter CW bands. Dan Tayloe, N7VE; Charlie Lofgren, W6JJZ; Bill Jones, KD7S; and David Bixler, WØCH; share design credit for the tuner and LED-based SWR bridge.

(For an enlarged view, click on the images.)