1:4 Voltage balun 3.5 - 30 MHz

Flat SWR  from 3.5 to 30 MHz with 8 double turns on a 4C65 or FT140-61 toroid.
SWR  1: 1.1 in the centre.

The 4C65 was used  because it was in stock . A FT240-43 with 12 turns wil provide a almost flat range from 160 - 10m.