Hi Uwe, My active VLF antenna inside a plastic tube was hanging down since a few days, see the spectrograms. Now i repaired that and the signal levels are back to their normal level. You are coming n
Carrier of DJ8WX measured in about 80uHz bandwidth. S/N is 18.4dB in this bandwidth. http://abelian.org/vlf/tmp/151208a.gif The magnetic flux density of 0.1fT corresponds to around 30nV/m electric fi