Hi Paul, VLF, Am 17.04.2010 17:58, schrieb Paul A. Cianciolo: I wonder if you can point me to the schematic of your final amplifier? It would be nice to learn from amplifier building experience. Yes,
You may find this of interest. We have found at 87 kHz (cave radio frequency) that you do not get the full benefit of multiple ground rods unless they are spaced by at least twice their depth. In you
Hi Alan, Paul, I think that wether radials or ground stakes give the best results depends on frequency and soil conductivity. On 136kHz I did a lot of tests and ended up with a system of 6 radials bu
Hi Rik I agree that every location is different.....I just caution in drawing conclusions from results at top-band or even 500 kHZ and applying them to 9kHz. The skin depth and ground parameters at t
Paul, Great work! Nice looking coil! How much power can you crank through it? At 5kM, I believe that you are still in the near field (9kHz wavelength is 33km), so signal will fall off at the 3rd powe
John, Yes.. I do fid that interesting! Do you have anymore detail on how you are making this observation?? PauLC W1VLF You may find this of interest. We have found at 87 kHz (cave radio frequency) th
Dear Paul and Jay, this is an excellent result, well done! The crossover between reactive nearfield (E ~ r^-3) and farfield (r^-1) occurs at lambda/2/pi = 5.3 km. As you seem to have quite a bit of m
Thank you sir!!! Paul, There were several references to this topic in the Cave Radio & Electronics Group Journal. I have a complete set to date of its publication. I will go through to let you know w
Paul, There were several references to this topic in the Cave Radio & Electronics Group Journal. I have a complete set to date of its publication. I will go through to let you know what I find. 73 Jo
Hi Rik, I think that I must have omitted something. The blue barrel is the 277 mhy not counting the coils on top of the barrel. Total L was 345 mhy which was too much and forced operation to 8890Hz S
Stefan, Thank you. Power applied is 54 watts from a public address system audio amplifier. This is the overall antenna system impedance. The DC resistance of the coil is about 80 to 90 Ohms I wonder
Markus Valued commentary as always. Plans are to continue making improvements in the station. What are your feeling about the ground at 9 KHz? Currently I am using 3 2 meter ground rods spaced 2 mete
Hello Paul, congrats on your achievement. Based on L = 0.277H and f = 8890Hz the antenna capacitance is 1.16nF. You must have an impressive amount of wire up in the air. Regarding "ground" : did you
Paul dont put a lot of effort into "radials" they are I feel unlikely to give much improvement. They need to be at lelast 1.8th wavelength long to have advantage. Just roll something out and measure
Hello Folks, Today we made our first outdoor transmission on VLF. The system resonance forced the transmissions to take place on 8890 Hz at least until I can get a variometer worked up. The distance
