Hello Markus, ULF, I'm now sitting in my car, TXing in the forest. It is very silent here. I can hear a faint 'crk' in the FETs when the phase toggles :-) Getting 2.44 A now on the 1130mground loop,
Solid copy here, obvious correct decode. Carrier Eb/N0 +1.0 dB, BER 39.1, constant reference phase. S/N: 17.03 dB in 133.5 uHz, -21.72 dB in 1Hz, -55.70 dB in 2.5kHz -- Paul Nicholson --
Hi Stefan, perfect decodes at DL0AO: H-field (E-W): Eb/N0 = 5.0 dB(car), 5.4 dB(sym), E-Field: Eb/N0 = 11.0 dB(car), 10.9 dB (sym). Thanks for the nice nighttime activity! Best 73, Markus --Ursprüngl
Hello Paul, Markus, Wow, amazing! We've done it :-) 7 characters in 2 hours at ULF. A first message from DL > UK. Think about how long we needed to TX and stack for the 14 dB SNR spectrum peak 2 year
Yes well done, another milestone for the list - http://abelian.org/vlf/amateur-radio/ Perhaps also the longest ground loop antenna used for amateur transmission? -- Paul Nicholson --
Am 07.04.2019 07:17, schrieb Paul Nicholson: Perhaps also the longest ground loop antenna used for amateur transmission? You never know. I can imagine that a few more people used similar antennas, bu
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
Jacek, I'm right now trying to decode the message from your stream recording. First i did not expect much but a first attempt with vtread -T2019-04-06_20:25,+125m /jacek | vtcat -p | vtfilter -a th=4
Hello Jacek, Most interesting. Did you expect at all that you catched the signal? Below 3 kHz over that range, we thought it is completely impossible for amateurs, didn't we? Let's keep on trying! Be
Am 07.04.2019 01:10, schrieb DK7FC: Wow, amazing! We've done it :-) 7 characters in 2 hours at ULF. A first message from DL > UK. Think about how long we needed to TX and stack for the 14 dB SNR spec
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
RR Jacek, I did not get better results than 15.05 dB using vtread -T2019-04-06_20:25,+125m /jacek | vtcat -p | vtfilter -a th=4 -h bp,f=2970,w=3000 | vtfilter -h hp,f=2000,poles=8 -h lp,f=3600,poles=
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
Hi Jacek, ULF, That's great! Amazing! 976 km distance in the ULF range! A decode at 15.63 dB carrier S/N. Can you describe your RX antenna and location/position of it? Thank you for your work! I will
Hi Jacek, 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 mi
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