Hi ELF friends, Just for those who are interested... I have now finished my modifications to the ELF RX / preamp design for a long wire (E field) antenna. This is the final schematic https://dl.dropb
Hi Stefan, very nice result! Your spectrogram also contains 60 Hz from America, not too conspicuous but easily visible with a little visual averaging. 73, Markus (DF6NM) --Ursprüngliche Mitteilung--
Markus, Another thought: Could it be the frequency of an old monitor running 60Hz frequency for the screen? Wolf already sentioned something... It was a matter of frequency stability that gives the p