Dear group, We can be optimistic about further successes in the VLF sector i think. The most enjoyable finding (within ham experiments)is, that the E field decay relly seems to be rather ~ 1/sqrt(d)
Peter, you are in Kiel. This may be one of the best regions in germany for kite antennas :-) Which kite have you used for your tests? Anything better than the "Jumbo power sled 36" (or 81)? Greetings
Paul, can you add DF8ZR's Spectrogram to your overview website? I will publish the link on my qrz site. It is a very informing nice overview, thanks! Stefan ________________________________ Von: owne
Yes Roger, sorry, but he did not receive me. Sorry Alexander. But as i wrote it was a first test and as we know from LF: The RX side is also important, just as the TX side. And my signal was 23dB wea
Dear Dreamers, The wind forecast is excellent for this weekend! http://www.windfinder.com/forecast/frankfurt and no rain... So, probably, but still not sure, i will be QRV again on Sunday the 21. Mar
Paul, I plan to use an inductive coupled primary coil, out of bigger wire. The impedance level is still not defined. Maybe it will not be 50 Ohm, Just anything above some Ohms. The PA has a big outpu
Dear Jim, VLF, few metres around the feed point. That sounds very interesting and makes me hopefully to be able to decrease my earth losses. On LF, the copper plate on the ground is a fine solution f
Hello Paul, Addition: If your C is 340pF and you want to resonate at 8,97kHz, your 545mH coil is to small! You will need L = 926mH! GL, Stefan/DK7FC ________________________________ Von: owner-rsgb_l
Very nice Paul! I hope i can generate a peak outcoming of the noise in the picture ;-) Yesterday i have got a PVC tube with 25cm diameter and 2m long. Additionally i have bought 0,4mm diameter enamel
Hello Paul, Yes, 1500 turns and 1,2m high is good for handling voltages well above 50 kV rms and you may get a proper Q. If you can get isolated wire instead of enameled wire, you will get some dista
Good work Paul! So, we can now even better estimate the limits of what is possible (distance) with a given ERP and given noise background. You told me you display an audio stream from the sicilian VL
Hi Wolfgang, Yes, i know about the optimum L/d ratio but i haven't such a Wasserfass ;-) Cooling the coil by water inside is rather a joke i assume? :-P The high epsilon r (81) would slightly decreas
Paul, Markus, LF, Bernd is trying to improve his RX ant. He cannot really receive the alpha stns. Is the transmitter on 11,904 transmitting the whole time? For a first test i connected one leg of my
Excellent Paul! Tnx for motivation ;-) I know the LT1028 as the best audio op amp (available for noncommercial customers) for such applications and have also built a narrow band LF preamp with it. In
Hi Dave, LF, Yes, i know about these problems with wet braids. It is not only a problem of kite antennas. I had the same problem on my LF QTH in 2003. As mentioned i think a very well suited material
can return useful measurements. Yes, really. And who could be one of those? Does one of the italian OMs know more about the website http://www.vlf.it/ ? There should be many interestets and probably
On <9KHz there is only the need for a transformation to an impedance range say below 100 Ohm so that voltages are not to high and currents are not to high. 1 Ohm is to less i mean, unless the primary
Paul, Before the VLF theme came up, my special interest was the transmission of the RX signal by an fiber optic cable. This greatly reduced the local noise coupled into an active E-field antenna in m
