Der VLF dreamers, LF, I am glad to present you my new (and first) grabber for the dreamers band! It is running (in the web) not even one hour! Take a look at: http://www.iup.uni-heidelberg.de/schaefe
Dear VLF, Due to poor wind (http://www.windfinder.com/forecast/frankfurt) i cannot make a new experiment this weekend, i am sorry. The next weekend, i have no time, sorry. So, i hope we can get new s
Hi Daniele, I mean, it depends on the surroundings and the space you have for an (RX) antenna. If you live in the nature, e.g. in a farmers house without electrical energy except a solar panel, batte
Paul, This sounds fascinating. For me almost unbelivable that it is a recorded electromagnetic wave? It rather sounds as if someone who walks through the primeval forest with a microphone and a recor
Hi Jay, Others (than me) may answer your question better. I just want to say that i am happy that you improve your VLF RX :-) Maybe today or tomorrow i will set up my new VLF Grabber here in Heidelbe
Hey Paul, Congrats to that coil and the website! Believe me, i know about the work to wind such a coil. For me, it took 7 hours although i had a DC motor that rotated the water barrel for me. This ga
Hi George, Am 07.04.2010 08:34, schrieb George Vastianos: About the easyloop end 9 khz bf, never forget that: "A filter works correct and has the frequency responce that it was designed for... when t
Rik, Yes, maybe. But hopefully not at this weekend! ;-) 73, Stefan/DK7FC Am 13.04.2010 14:16, schrieb Rik Strobbe: Stefan, maybe thunderstorms coming up in the afternoon ? 73, Rik ON7YD Van: owner-rs
This is just a link to the diatnace to VTX, for increasing the fascination... http://www.iup.uni-heidelberg.de/schaefer_vlf/VTX_India.pdf 73, Stefan Am 29.05.2010 15:54, schrieb Stefan Schäfer: Hello
Dear VLF, In Spectrum Lab there are different methods for noise reduction (e.g. of lightnings). Those were discussed here in the last weeks. While Jim/M0BMU preferes the clipper (using 0 dB above AVG
Mike, Try to use just 65 % of the turns of your primary winding and i bet the optimum will be on 9 kHz! :-) 73, Stefan Am 31.05.2010 05:03, schrieb Mike.WE0H: Well worth testing. There might be some
Jacek, very interesting! So, it is worth to do a test with a large earth electrode antenna and moderate power (100W...500W) and a E field antenna. I would give a loop antenna a try too, as long as it
Dear VLF, At http://www.iup.uni-heidelberg.de/schaefer_vlf/12V_300W_VLF_PA.pdf you can get the circuit of my 300W PA i used at all the VLF experiments. The circuit is made in my well known simple han
Hello Horst, http://de.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=bf862 But you need to work in a business or know someone who works there to order. (Kein Verka
...means L(9kHz) = L(137kHz)*232 Am 15.05.2010 13:52, schrieb Stefan Schäfer: Mal, I assume you know your antenna capacitance so you can easily calculate your needed inductance. Or, if you know
The ALPHAs seem to come back! They have transmitted for a while during 10 and 11 UTC today. Currently they are ON too! In the last days they started transmitting for just a short while (some minutes)
Hi Alan, The ICL7667 is a double FET driver (inverting!): http://www.datasheetcatalog.org/datasheets2/14/147008_1.pdf So, if the both Qs are high, the outputs/gates are both grounded. You just have t
Hello Peter, No, it is 48 kHz but there seems to be a cut off by the soundcard or the soundcard-driver? I already noticed that DHO-38 is missing there ;-) So now i lock the soundcard drift to GBZ (wo
Hello Jim and all others, Tnx for your ideas! I could answer in a long mail, as usual ;-) but today i try to keep it shorter ;-) I have done some modifications to the active antenna. The main change
Hello Peter, Tnx for your comments again! Yes, there are still some lines that should not have to be where they are ;-) But anyway, it is the best reception i ever had. Now it's time to generate a te
