1:49 balun with FT400-43 material and the influence of the winding method on the measurement results.

6 windings together and 8 windings

distributed over the core

Windings distributed over the core

Schematic:

First measurement:

Windings distributed over the core without and with compensation capacitor.

Windings distributed over the core without compensation capacitor.

Second measurement:

Windings distributed over the core with compensation capacitor.

Third measurement:

Windings toghether on the core with compensation capacitor.

Bottom view.

Insertion Loss measurements:

Reference measurement to determine loss ft240-43 cores.

Insertion Loss measurements with the FT400-43 core:

Result of the FT400-43 core:

@ 1.8 MHz: 1.6 dB = 31 % loss (310 W @ 1 KW)

@ 3.6 MHz: 1.2 dB = 24 % loss (240 W @ 1 KW)

@ 7.2 MHz: 0.9 dB = 19 % loss (190 W @ 1 KW)

@ 14.1 MHz: 0.9 dB = 19 % loss (190 W @ 1 KW)

@ 21.3 MHz: 1.3 dB = 25 % loss (250 W @ 1 KW)