Stefan, it is clearly visible here, abt 10dB over noise in a 70Hz BW and even weakly audible. 73 Clemens DL4RAJ Loc:Südostbayern,12,90006°O/48,4150°N (Gridloc:JN68KJ) http://no.nonsense.ee/qthmap/?qt
Hi Rik, The driver is a IXDD414CI which drives the 4 FETs by using a ferrite core (Al=4000, OD=20mm). Primary 4 turns in series with 2 Ohm and 10uF. Then there are 4 secondary widings with 5 turns ea