Pete, 2.5km Cu wire of 0.2mm has a resistance of 1345 Ohm. So even if the coil doen't get hot by the HV it certainly will by the dissipated power. 73, Rik ON7YD - OR7T Van: owner-rsgb_lf_group@blacks
Given that virtually nothing is radiated then is it really “radio”?? Or could it be in fact our own version of PLT?? Albeit at very uber vlf and using the earth as the mains? Discuss? Wit
With 8 transmitting sites around the world at 10 kHz. The OMEGA navigation system. Like DECCA and LORAN the system is no longer operational. http://www.jproc.ca/hyperbolic/omega.html 73, Albert PA0A
Hello, first I'd like to share an interesting link that I found some years before: http://www.vlf.it/ed/earthprobes.html 8,79 kHz is random choice, not with any reason - except not to got to close to
base camp below? Couldn't our friends in NZ drive North Island and South Island as a dipole? 73, Chris G4OKW -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XB
Hi Group Using software to calculate what I would need to load my inv "L" on 8.9 kc/s with my 8 Ohm O/P 800 Watt audio amp I get :- A coil/transformer of about 1 Henry which with my air cored former
If you are considering WSPR, it may be worth looking also at a program called Laserscatter which is a multitone FSK mode using very low audio tones (20-30Hz) . See www.k3pgp.org/lflaser.htm 73 Robert
Unfortunely i have very few time for ham radio. But i read this group regulary. Usualy i don't write here now. But about VLF i wonder to point out that for near field antenna voltage is more worth t
Yep Rik So how do I load it? I agree there is about 780 Watts being disapated in the coil so it would act like a one bar electric fire while the wire held out before melting. I have other options of
Peter, Why load it and try to feed it as a current fed extremely short aerial. Would it be easier to calculate a parallel tuned circuit and feed it off the top....voltage feed. You could then use a m
Stuff the huge antennas, what you need to do is get an old audio amp, load the output with a 8ohm 100watt resistor and stick a large inductor in series with the smoothing capacitor so it rejects the
Frequencies below 10kHz are not allocated by International Treaty but we control all frequencies between DC and gamma rays, and no we will not be issuing any licences for that region. I believe that
With the ground wave, one could reach the whole europe, i expect. But that are dreams... Stefan/DK7FC Stefan, I you can manage to produce a significant ground wave signal the real advantage of 9kHz m
This calculations is for far field. But in this case near field is more significal if distance << lambda. For near field one can derive simple formula (extremally approximative!) U_{RX}=U_{TX}(h/D)^
The feed wires would keep getting snapped as the winds can be a bit fierce in Cook Strait. :-) Well, then: you have automatically generated QRSSSS weather forecasts. 73, Chris G4OKW
Jacek and group, That are really interesting responses here. That's what i like in this group! Well, perhaps it is not necessary to reach a "DX", DX becomes very relative in that frequency range. 50k
No license is required in the US below 9kHz. I agree with Mal its very difficult to radiate a signal on 137kHz, let alone 9kHz! -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1
Hi Pete & Group, Perhaps something like this one :- http://www.vlf.it/matteobruna/ULF_Induction-Coil.htm & others at :- http://www.vlf.it 73, Gary - G4WGT. On 22 February 2010 18:19, M0FMT <m0fmt@ya
I just did a simple test: I took 2 old LW ferrite antennas and brought them to resonance at 1.5kHz [...] Solid copy in WSPR, over a distance of 15m. [...] now try to repeat the same test with both an
