You might want to add a common mode choke.
Look here :
http://www.dg0sa.de/balun1zu4kleinptfe.pdf
It is in german, but the pictures show how easy it is to do. First, the
choke is shown.
The second core is the 4:1 transformer which you already have.
FT 140-43 cores will do. For higher power, use FT 240-43.
Connect : TRX->choke->Transformer->antenna.
--
73, Martin
Ohne CW ist es nur CB...
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