Beware, the Perseus doesn't work at a few kHz; it's nice for LF (where I use it too), but not for the lower VLF range. The reason is, I guess, the input filter which has an "L" between the input and
After Paul's hint to orient the loop for E/W, I can also see the NWC fading pattern with the indoor H-field loop, despite QRM : Cheers, Wolf . Paul Nicholson schrieb: Bearing was 78/258 deg +/- 4, NW
Greetings all, Those who -by chance- read this message in time: At the moment there is "Auroral Chorus" audible in Europe on VLF (a few kHz). Those calls (similar to panicing blackbirds) are not pick
Hello Markus and group, Thanks for the info, and sorry to hear that. Stefan shouldn't risk burning up the coil (if there is residual water between the turns, despite varnishing). The rain radar for h
Yes indeed, immediately visible at Todmorden, Cumiana, Nürnberg, two different RX sites near Bielefeld (DL1EDS and DL4YHF); second dot now begun. Well done again ! 73, Wolf . Markus Vester schrieb: S
Hi Stefan, Don't you think the same way? ;-) Yes, of course. I wouldn't consider buying such a PA, way too much output for my personal taste. Consider this: 2 kW at 2 Ohms, that's 63 V * 31 A, you'll
Dear Jim, Stefan and the group, Jim asked: I imagine Spectrum Lab must be doing the clipping in the time domain, i.e. limiting the maximum amplitude of any particular sample that is above the average
Nice work Paul - now you should invest in a half dozen cans of plastic spray to secure the windings and to impregnate the cardboard former ;-) 73 and good luck on VLF, Wolf DL4YHF . Paul A. Cianciolo
Hi George, I don't know the BBB-4 exactly but I was using a kind of E-field probe, actually the differential antenna shown here: http://www.qsl.net/dl4yhf/vlf_reception/VLF_Receivers.html I guess the
Hi Peter, Stefan and the group, Peter asked: How to lock the sample rate of a sound card against a MSK modulated signal? The only idea I have is to demodulate it and locking a re-sampling process aga
Hi Stefan, Markus, and the group, 8970 Hz is monitored in Todmorden, Sebring/Florida, Cape Coral/Florida, Cumiana/Italy, Spenge(Bielefeld) by virtue of Paul's combined realtime spectrum / spectrogram
Oops... the link to Paul Nicholson's VLF audio stream overview is : http://abelian.org/vlf/ 73, Wolf DL4YHF . (...still missing those Alpha signals for a quick frequency check... )
George Vastianos schrieb: as i understood stefan will mainly transmit on dfcw-600 right??? so is the 9kHz_4mHz.usr suitable for grabbing???? Yes, I think from DL to SV only 600-second-symbols (like D
Hello Peter, There are two algorithms, a hard limiter (simple clipper) and a noiseblanker. Fot the clipper, the average (of the signal power) uses a simple lowpass filter with a time constant of a fe
Nice signal here from the begin of Stefan's transmission. Later, strong QRN, and it takes a lot of imagination to see something like a "K" in DFCW around 13:30 UTC (15:30 local time on the screenshot
Hi Roelof, about the E-MU 0202... There is a message in the driver package talking about a "hot switching" issue, which seems to happen at system boot up. It can be solved by manually switching it of
Hi George, You will find suitable settings on DF6NM's VLF grabber site: http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm Scroll down to the bottom of the page, right-click the link, "save as", and unzip
Hello James and Wolf O. , Hams 4 Hams .com have 15 and 20m fiberglass telescopic poles, that would make a good vertical element Confirmed.. and if you decide to go on a trip to Friedrichshafen this y
