Hi Wolf,

Am 15.05.2016 um 14:12 schrieb Wolfgang Büscher:

Interesting application .. but wouldn't the operation of such a simple transductor (wound on a single ferrite core) depend a lot on the 'RF drive' itself, and / or have different influence on the positive and negative half wave ? Transductors for mains frequencies (as used in Theaters for electric lighting, long before the semiconductor age) used a balanced configuration, so the satturation appeared symmetric for both half waves. I think the Alexanderson alternator at Grimeton uses a similar principle for the modulator (keying). So for a high-power application, one would possibly need two ferrite rings, RF coils "anti-parallel" (with opposite DC magnetisation).

So did Stefan by using an 8-formed winding for the DC excitation!

73,
Tom, DK1IS