Hi ELF, This afternoon i'm attempting to transmit on my INV-L on 136.172 Hz (not kHz!). Just preparing my H bridge VLF PA and i intend to use an old 10 kV transformer which i got from an old furnance
Stefan, Let us know the result! The U.S. Navy had a facility at Clam Lake Wisconsin using 3 MW and a 45km long antenna they achieved 8W ERP at 76Hz, see more at: http://fas.org/nuke/guide/usa/c3i
Stefan, this could work. In the capacitive near-field range, the electrical field would be E = voltage * capacitance * effective height / (2 pi epsilon0) / distance ^3 With 10 kV on your antenna capa
Hi Markus, Thanks for the calculations. We will see the results. I do take care. In my promotion project at TU Darmstadt i daily worked with a capacitor battery having 15 kV / 12000 uF, see an image
Hi Stefan, interesting stuff! Keep in mind these oil burner ignition transformers are designed to feed a spark with high ignition but low burning voltage - nearly short circuit. So they have a large
Hi Tom, Am 10.10.2014 12:15, schrieb DK1IS: Hi Stefan, interesting stuff! Keep in mind these oil burner ignition transformers are designed to feed a spark with high ignition but low burning voltage -
Hi ELF, Unfortunetely my HV transformer got (obviously) an internal short cut during transmitting on 136 Hz. With a scope and HV probe i measured nearly 10 kV rms on half the output. So there must be
Hi Stefan, Have you done any more tests with this? I am curious to see the results. Would this idea work on VLF as well? I have come across some power toroid transformers that have a reasonablywide u
Hi Dimitris, Well, i have had 2 of these HV transformers. The first one got an internal fault during the experiments. A few weeks later i took the second one and wanted to repeat the experiment but i
Hi Stefan, it's always worth giving it a try! There are people that use toroid power transformers as valve/tube output transformers. So don't disregard them for audio use! I agree that the efficiency
