Hi Stefan, yes, that's me also known as VK1SV but I have changed states and I have a new callsign now. :-) In fact I have both as I am using VK1SV at the university for the cubesate ground station th
Hi Roman, thanks for the links, I would have never found them through a search engine as I don't speak russian. Looks like an interesting discussion, I will certainly have a read. To my surprise, the
Hi Clemens, A difference of 2 cm would be true for the radius but not for the diameter. I would define the inner and outer diameter as seen in this picture: https://cdn.app.compendium.com/uploads/use
Hi Stefan, In my experience these polypropylene capacitors when they fail, they just lose some capacitance. I think they call it 'self healing', maybe they imply that when they fail there is no short
Hi all, I have a few mica capacitors that came from a MW broadcaster, similar to this one (in fact I have one that it bigger than this one). Stefan, I think this is probably your best bet and pity yo
Hi Stefan, I am working on both making a portable VLF magnetic field antenna (tuned) and a transmit antenna which perhaps will be better than the existing 120 m by 3 m (average height) loop. The resi
G'day Stefan and Edgar, My house is on QF44OX00OR and the property extends to QF44NX (50 acres or 200,000 m^2). I do have permission from some neighbours to lay wires into their properties, so an ext
Ciao Marco, yes, the grass is indeed greener on the other side but I am not complaining about that! If there is no time now, perhaps there will be later! More things to do when I retire, there is not
Hi Marco and Stefan, Competing with NWC Harold Holt would be insanity, regardless of the regulation, that's a frequency to certainly avoid :-) You must have a much larger antenna than me as in my cur
Hi Stefan, that's insane! What's the purpose of the DC offset of 7.5 kV? Is the antenna tuned (unlikley) or you are just applying the volts from a voltage amplifier? Hope the antenna is well insulate
Hi Stefan and VLF, well, I am now officially hooked! My signal on 29.5 kHz (VLF's edge) has been detected 22.3 km away in Canberra by Dale VK1DSH. Only casualty is the russian mica capacitors (K31-11
Hi Stefan, Yes, see answers below! The amplifier output power was about 50 W. Calculated current based on measured parameters about 2.2 A RMS Yes! E-field antenna (miniwhip) to an upconverter and HF
Well, what do you know! The unexpected losses are not just the capacitors (their contribution is probably small). It is also the coaxial cable that I used between the antenna feedpoint and the ampli
Hi Luis, Looks good! My first large loading coil was my laundy basket. My wife wasn't terribly impressed but for a period, it served both as loading coil and a laundry basket :-) 73 and good luck wit
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 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 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
G'day Stefan, the last couple of days have been quite noisy over here so it would have been almost impossible to get through. Anyway, I am leaving the grabber to your frequency, hopping that we may g
Hi Stefan, Last two or three days have been rather noisy, yesterday I had to turn down the volume of the receiver as the static was reaching annoying levels. But hey, transmitting _is_ fun and I am s
