Hi all, The 6470 Hz signal was also detected in Tordmorden, even though with some difficulties. Paul's message to the LF group below. 73, Wolf . -...- I notice OE5ODL transmitting near 6470 today. Ve
Hi Claudio, indeed, the nice asynchronous counter (which processes signals way above the pic's clock frequency) doesn't exist in the Atmel chip ... some builders of this PIC based frequency counter s
Hello Stefan, Chris, and the group, Actually, I think they invented it for good economic reasons. I think it's got to the point where it's cheaper to have two power wires plus two signal wires going
Hi Stefan, I used both (PICs and Atmels, ATmegas, and a bunch of others) and would suggest to .. - avoid 14-bit PICs (they are really dreadful if you need to do arithmetics, and there is only a "pseu
Hi Markus, Indeed impressive ... even though my assumption about Ossi's antenna being "fixed" (not partially airborne) may be wrong.. would be interesting to know a bit more about the setup, ERP, ant
Hello Markus and Stefan, Phew, that sounds interesting.. the question is how to convert the output of the inverse FFT (with the 'analog' chirped Hell signal) into your described digital (square wave)
Am 19.01.2011 21:28, schrieb Laurence KL7UK: I cant remember is DHo38 stable to be used as a reference recently with SpecL? - Ive lost NPM for the moment and making a mess of the display :-)) Laurenc
Thanks Chris, also for your message to the VLF group. Will be interesting to see where the signal really comes from. Good luck to you and Stefan for the experiment ! 73, Wolf DL4YHF . Am 05.02.2011 0
Hello Dex, Try to use a bit larger bandwidth, and use the average power function (avrg_n, see below). For FSK, MSK, and similar modes, the *power* contained in the signal is independent of the modula
Thanks Markus - the info is much appreciated, and has been forwarded to the VLF group. btw I abandoned the Florida web-stream analysis when Stefan switched to the faster QSO modes... ... lacking Andy
The 26 kHz TX is back, but I guess those equipped for VLF will be busy at the moment ! 73, Wolf DL4YHF . (VLF grabber reprogrammed, but not much hope to copy Stefan in Sebring, Florida ;-) http://www
Greetings all, There seems to be a new transmitter being set up at the moment. It only operates occasionally, but quite strong here when it's "on". Some speculation in the VLF group about the exact l
Hi Daniele, Yes, it was speculated that the transmitter actually uses a tethered balloon (but the antenna bearing was too far off): 30°58'18.75"N, 35° 4'27.04"E (Which brings us back to portable VLF
Hi Dex, http://www.w4dex.com/lf/HGA22_0030_19feb11.jpg Interesting, the sine-shaped pattern is still there - and the 'oscillation' frequency is suspiciously constant. Would be interesting to see an F
Thanks Andy, nice project.. maybe I should dig out the PIC programmer again... ! One suggestion for VLFers: A PIC doesn't cost a fortune. Build two of these generators, and clock them with the same s
Stefan : Nice signal as usual, and good luck with the DX VLF Listeners : There is intense and ongoing Whistler activity, and aurora, on VLF at the moment. So if you can listen with a broadband antenn
Thanks Markus - I temporarily switched the FFT for my VLF live streaming PC for 700 uHz bandwidth. Not sure if your signal will make it through, because I cannot sync the netbook's sampling rate to D
Oops, forgotten Stefan's report: Stefan's 8970 Hz signal is 30 dB over noise in a 2-mHz receiver bandwidth, without the noise blanker. This is actually the "vlf6" stream mentioned below. The receiver
Nice Red Rose there... looks very familiar to me (ancestors in the "Lipperland", Germany), but someone rotated it by 36° ;-) : http://de.wikipedia.org/wiki/Lippische_Rose 73, Wolf .
Hi Dex, You can possibly scroll back the plotted graphics (depending on the memory, or number of samples, reserved for the plotter channels). Usually the memory is larger than the visible part of the
