Hi Stefan, Dimitris, room is sure a thing that is not missing in VK :-) I remember a vacation I had there some years ago ... a lot of km between "adiacent places".. so ideal place for LF, VLF and eve
Hi Marco, Yes, i totally agree with you :-) Fortunately i have enough time and money but room, room is never enough if you are as crazy as i am.. BTW i've been on the tree again today until it was ne
Hi Dimitris, VLF, Am 10.02.2019 09:47, schrieb [email protected]: (RF? it is almost DC hihi) Ehm, no, it is almost LF! 29.5 kHz, you can't even hear that. The other (left) side of the audio spectru
Hi Stefan, Given the antenna has an impedance of about ~4 ohm and the amplifier produces its maximum output on that impedance, it was tempting not to do any impedance transformation and to stay at 4
Hi Dimitris, VLF, Am 11.02.2019 01:07, schrieb Dimitrios Tsifakis: I have an idea about impedance transformation and that is to use high power 70V/100V audio distribution transformers at both ends. I
Hello Stefan! Today, the ferrite cores B64290L82X830 came to me. I'm building a transformer 1:1/1:4/1:9/1:16 and 1/25 on the VLF. I'll check if it works soon. 73! Marcin SQ2BXI Hi Dimitris, VLF, Am 1
Hi Stefan, I do have some ferrites that may be suitable for impedance transformation at audio over a kHz, perhaps I should stop being lazy and I should wind a transformer for testing. I keep forgetti
Hi Dimitris, Am 11.02.2019 22:44, schrieb Dimitrios Tsifakis: [...] and I should wind a transformer for testing. Yes. First you only need the primary winding to see if it stays cool at the full volum
Hi Stefan, I'd love to participate in a pub outing with VLF gurus! There's nothing like a good chat over a couple of beers! I will do a proper test: an appropriate resistor (50 ohm if I decide to do
Hi VLF, Just finished making a pair of impedance transformers. I used some junk box large (OD=61.5mm, ID=37.5mm, L=12.8mm) ferrite toroids of unknown material and I stacked two on each transformer. I
Hi Dimitris, Am 13.02.2019 00:35, schrieb Dimitrios Tsifakis: Sadly there are no koalas here, they used to be here but not anymore. Also sadly, Australian trees are not very good for climbing, they a
Hi Stefan, What I was thinking is the induced polarization phenomenon in geophysical ground measurements. It has to do with mobilization of ions near the electrodes in the ground due to the constant
Hello VLF! The primary coil of the transformer is ready. 10 turns (diameter 2mm) give 9.62mH which gives about xl=500Ohms at 8.27kHz. It is a good idea! 73! Marcin SQ2BXI Hello Stefan! Today, the fer
Hi All Transformer is ready. https://klubnl.pl/wpr/en/index.php/artykuly/uniwersalny-nadawczy-autotransformator-antenowy-na-pasma-827khz-136khz-i-472khz/ 73! Marcin SQ2BXI Hello VLF! The primary coil
