Wall-mounted loop antenna
Vertical antenna with 2 elevated radials for the 20 meter band.
How the ATU was build
Measurements to determine practical losses in an ATU (Antenna Tuning Unit).
Guanella 1/4 balun 1 core versus 2 separated cores.
Receiving loop antenna for indoor or portable use revised version.
Guanella 2/1 current balun
The use of a line output transformer core to make a balun.
Receiving loop antenna with 3 turns i.s.o. 2 turns.
Receiving loop antenna for indoor or portable use.
Loop On Ground Antenna
Guanella 1/6 current balun.
Guanella 1/9 current balun.
Building a QRO 1/49 transformer for end fed antenna.
The Turrin balun
Guanella 2 wire balun versus Ruthroff 3 wire balun.
The Ruthroff balun (1/1 3 wire version).
Guanella balun 1: 1 comparison between two and four conductors.
Building and measuring a Guanella 1:4 balun with Wurth cores 74270191
1/1 Current Balun with 15 turns on Wurth core 74270191 for better low frequency behavior.