Hi VLF, It's time to come back to 5.17 kHz where i have been in the last kite experiments 2010/2011. The best result was about 10 dB in 3.8 mHz in 904 km distance, detected by SQ5BPF. His website abo
Hi VLF, I managed to resonate my antenna on 5170 Hz. It was necessary to increase the inductance from 1.2 H to 2 H. This was done by increasing the number of iron powder cores (T106-52) from 100 to 1
So far 12.1dB in 93uHz, -62.2dB in 2.5kHz, quite a decent signal. With that signal, I expect an easy decode at about Eb/N0 = 4.5dB. I cannot work out exactly where your antenna wire runs to so unabl
Hi Stefan, during the last hours a good peak apperared here, around 13 dB in 63 uHz. If this is really your carrier (and not just a local GPS harmonic), tomorrow's EbNaut sequence should become an ea
Hi Markus, Paul, VLF, Markus that looks great! Also the good SNR report from Paul made me most excited. It was uncertain which propagation has to be expected on 58km but from the first impressions it
Hello Paul, VLF, My congrats, the message is correct! :-) The first EbNaut on 5170 Hz!!! I did not stop transmitting since friday afternoon (unfortunately this makes my LF grabber unusable). So maybe
Distance 504.6km to Renato Romero's online receiver 'vlf15' at Cumiana via http://abelian.org/vlf Easy decode from the recording of vlf15 (this is after a stage of vorbis compression and decompressio
Copied '517' in Cumiana too: List rank: 1867, symbol error rate 43.75%, constant reference phase. Carrier Eb/N0: 0.3 dB Carrier S/N: 12.62 dB in 53.9 uHz, -64.0 dB in 2.5kHz. -- Paul Nicholson --
I did not stop transmitting since friday afternoon (unfortunately this makes my LF grabber unusable). So maybe you got some first informations about propagation on 58km? It seems to be a promising ba
Hi Paul, VLF, Many thanks for the decode and analysis of Renatos data! Well, 517 is correct of course. But HNY would have been the better choice for a message. But i just woke up 4 minutes before 9 U
Hi Paul, Am 30.12.2016 19:57, schrieb Paul Nicholson: I cannot work out exactly where your antenna wire runs to so unable to try calculations. I can see where one end is on the IUP building, but not
Stefan wrote (28th Dec): Stefan wrote (2nd Jan): Thanks. From Google it looks like the wire length is 53m. I put the significant buildings into LCnetgen and it gives antenna capacitance 402pF with 12
Could be. No such problems here due to using LP smoothed pulse for centroid measurement. Needs about 15.9 Gbyte RAM when using the optimum list length of 62k. Would be a silly amount of memory except
Let's try further challenges on 5.17 kHz. A first night transmission: f = 5170.000000 Hz Start time: 02.Jan.2017 17:00:00 UTC Symbol length: 40 s Characters: 5 CRC 16 Coding 16K25A Duration: 12h, 2
Looks good. Last night the carrier 2017-01-01_17:00,+44800 at 5169.99975 Hz measured 0.135 fT but the signal is spread across 70uHz for some reason. It may decode at Eb/N0 between 3 to 5dB, hard to s
Thanks Stefan. But I'm afraid it won't work: There was absolutely no hint of your offset carrier in my 63 uHz spectrogram, and also not in another one with 31 uHz bins. Perhaps I was too optimistic a
Paul and Stefan, Nice work, including parameters and modeling. Was the LWPC TX antenna angle parameter fairly close to actual angle? 73, Jim AA5BW Looks good. Last night the carrier 2017-01-01_17:00,
Received 'HELLO', BER 41.1%, constant reference phase. Carrier Eb/N0 = +1.0 dB, S/N: 15.57 dB in 22.3 uHz, A little weaker than expected. S/N -64.9dB in 2.5kHz after sferic blanking. Before the blank
