Stefan, thanks for the congratulations! We will be doing further experiments. This one was done in haste, and could have been planned better, so for sure there is room for a lot of improvement. We (M
I've also put pieces od filter paper with NI3 on the floor to let it dry Regarding the other reagent - every country has it's tasty specialty. If any of you ever come to Poland i would be pleased to
Stefan, did you try contacting any geophysisists in your area? Maybe they have an ULF receiver, and could give you access to the data jacek Hi ELF friends, During the last 2 weeks i've done another e
Actually a similar experiment to Stefan's has been done already, and at much lower frequencies (almost 0Hz :): http://aerohistory.org/Wireless/loomis.html In this case the power supply is from the cl
I haven't tried this with 300m kites, but even ordinary low-band dipoles can charge quite quickly if they are high enough, so 100uA seems to be a good approximation. This is already comparable with t
The HV triodes are a good idea (PD500?). Maybe a GPS-synchronized rotary spark gap? VY 73 Jacek / SQ5BPF Greetings, How about using an ancient high-voltage "ballast" triode, as used in colour TVs ? T
From observation: when a charged cloud passess by, you can get about 15mm sparks from a dipole for 80m hung between two 7-story buildings. This happens more often than once per second. Say 40m horizo
Hello (uncluding photos): https://klubnl.pl/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00087.html He says it's 50W. http://sp7pki.iq24.pl/default.asp?grupa=165822&temat=441483 Someone was l
A public searchable archive is here: https://klubnl.pl/rsgb_lf_group-archives/html/rsgb_lf_group/ It has been put together from various personal archives (my archive, Dave G3YXM and Markus DF6NM), an
An OM (OT!) of my radio club told stories of his early radio experiments. He had a friend in some 100m distance and they lay out a small hidden wire into they ground between their QTHs, using the ear
Did you use your large computer at work to try to get the best result? no, unfortunately i had to give it back. but i did a simple search over a small set of parameters (a few hundred -a , -t and -d
Stefan, I've tried to bruteforce the right filtering and noise blanking parameters. So after a few thousand tries i get: sq5bpf@jitter:/stuff2/sq5bpf/vlf_stefan2$ vtcat -p < stefan_2970_1 | vtfilter
For future tests it would be useful to have a grabber window on your side, showing 1...3 kHz in one spectrogram. It would be just to see how and when the QRN/M starts and when it has its minimum at n
That's great! Amazing! 976 km distance in the ULF range! A decode at 15.63 dB carrier S/N. Improved parameters: sq5bpf@jitter:/stuff2/sq5bpf/vlf_stefan2$ vtcat -p < stefan_2970_1 | vtfilter -a th=4
For some reason the results i get from ebnaut are different depending on signal bandwidth. For Stefan's latest 2970.1Hz transmission it is better to use 10Hz sample rate than 240Hz: 10Hz: sq5bpf@jitt
Good idea. When do you want to do that? Is the equipment available already? We could make a sked at night :-) No, i have to order an audio injector card, and find a way to reliably connect to the in
i'm still trying to find improved decoding parameters for Stefan's last transmission, so that i can use them in later tests on ULF. so after trying a few thousand more parameter combinations, results
