Off-Centre Fed Dipole Question/s

[VK2CSW]

I managed to get hold of some plastic strain insulators at Farmer Johns at Nuriootpa. A bit larger than I wanted, but they seem to be hen's teeth.

I got to work on the 4:1 balun and it turned out quite well. Two stacked FT140-43 toroids inside some 50mm PVC pressure pipe and end caps.

Put some resistors adding up to about 250 ohms across the terminals and swept it with a NanoVNA. At 7.0 to 7.3 MHz it transformed the resistance to just under 50 ohms.

Good enough for me!