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
At 20.55 26/04/2010, you wrote: You may be better building a LF convertor ? G .. I agree... probably a better choice, if you already have a decent HF receiver. If not... consider buying a Perseus, bu
Looking for a "big" VLF PA ? well, I have a Velleman VPA2600 amplifier - 2x 600 W at 8 ohm, 2x 900W in 4 ohm, may be paralleled or bridged. It's defective (broken final transistors, I presume), but c
No, I don't want to transmit with the miniwhip :-) !!! The question is, how does the miniwhip behave in an electric field of some kV/m, that is, close to the transmitting antenna in 137 or 500 kHz? A
Hello Roelof, If your friend has a problem, I will sent him 10 J310's for free! Please send (at least) 240 J310 :-D Thanks for the answer. Marco IK1HSS thanks as well. 73 - Marco IK1ODO
Hello Gerhard, the 100n capacitor will do nothing, it is in series with the input pad capacitance (a few pF). The diodes will clamp at 0.6 V, that is too low (every static "crack" will send the diode
I want to try a LF converter using this mixer. Does anybody know a (cheep!) distributor in Germany or EU for 1...3 pieces of it? I've just found one where it costs about 40 Euro and this is to much!!
To monitor solar activity I use this web site: http://cfivarese.altervista.org/SI_Macchie_solari_real_time.html It is mainly in Italian, but of course the picture speak for themselves - it's a good c
John, it is a switch-mode power supply. Look at the stronger bands every 100 Hz. May be a luminary, a LED lamp, a CFL, a TV, a PC, a battery charger... To locate it may be really difficult. By first,
At 21:12 06/01/2011, you wrote: CQ X BAND 502 QSX 3595 USB MF-1/7 TX 502 USB Copied in JN35sa, in a sea of QRM: RX1: 21:44 @ 0,4 Hz: CQ X DE G0NBD QSX 502 3585 4 BD K <STOP> -28 dB RX1: 21:50 @ 0,4 H
I would like to improve a bit my home-made pre-selector for LF/MF. I would appreciate very basic advice on "mechanical" aspects like the following: the pre-selector has some molded inductors that can
The first Schumann resonance is not at (300000/40000)=7.5 Hz, but higher, usually around 7.7-7.8 Hz. I was astounded when I observed it for the first time about 12 years ago and found that the freque
At 11:00 01-06-11, you wrote: 300 amps for the ZEVS antenna current ?? Where does this value come from, please ? Jean-Louis F6AGR The info comes from Trond Jacobsen researches: http://www.vlf.it/zevs
Yes it is not Amateur Radio but there is none of that at the moment. It seems after many weeks that these are indeed Schumann resonances, if not I hereby declare the Victor/Eddie Resonances. er... we
Good copy in NW Italy, "wet string" antenna (HF vertical multiband as-is, just slightly out-tuned :-)) plus Perseus. Approx 20 dB S/N in 80 Hz, -120 dBm noise, lots of QRN. 73 - Marco IK1ODO - JN35sa
http://www.radiomuseum.org/r/hrb_hw1390a.html I found this item available on eBay as well: http://www.ebay.de/itm/HRB-Systens-HW1390A-Extremely-Professional-built-SLF-ULF-ELF-VLF-LF-MF-Receiver-/2508
