Full-color, full-resolution graphics from the pages of QRP Homebrewer
QHB #8 -- April 2002
Build a Low Power 4:1 Balun , by Charles Greene, W1CG |
Figure 1. Two types of coiled
transmission line 4:1 baluns using ferrite or powered iron cores: (A) The
Guanella or Current balun; a two core balun like the one described in the
text is shown. (B) The Ruthroff or Voltage balun. |
Picture 1. A single core of the two core
current balun with the coils connected as a voltage balun. |
Picture 2: Lead a cable tie around the
core and one end of the wire pair about 3" from the end and tighten
it. |
Picture 3: Balun core in vise showing
heat shrink tubing on outside of windings. |
Picture 4: Balun core with six turns
showing crossover on the seventh turn. |
Picture 5: One completed core. |
Picture 6: Completed two-core 4:1 balun. |
Picture 7: 14 turn version of balun in
watertight enclosure for installation at top of Off Center Fed antenna. |
Figure 2: Block diagram of test setup. |
Picture 8: Test setup showing some of
the equipment used. |