Hi Stefan, sorry, no result from here due to a silly setup error: A while ago, I had the changed the FFT resolution from 62.8 to 31.4 uHz, but forgotten to double the number of exported bins. 73, Mar
VLF, Another one: f = 8270.100000 Hz Start time: 23.May.2017 18:00:00 UTC Symbol period: 40 s Characters: 4 CRC bits: 3 Coding 16K21A Duration: 8h, 21m, 20s Antenna current: 700 mA 73, Stefan Am 22
A couple of easy decodes of the very strong signal from Stefan. Eb/N0 8.5 dB. BER 18.6 %. constant reference phase. carrier S/N 26.86 dB in 32.9 uHz, -17.97 dB in 1Hz, -51.95 dB in 2.5kHz. Eb/N0 12.6
Got a fine decode in Nuernberg with 6.8 dB Eb/N0. Kaum macht man's richtig geht's ;-) Best 73, Markus --Ursprüngliche Mitteilung-- Von: DK7FC <[email protected]> An: rsgb_lf_group <rsgb_lf_group
Hi Paul and Markus, Great results! Thanks for the reception and decode. Well, let's try something for the record list again: f = 8270.100000 Hz Start time: 24.May.2017 20:00:00 UTC Symbol period: 1
Good! The DL0AO grabber has just come back online again. The current buildup of easterly QRN is brightening the separate "6000" E- and H-field spectrograms, but seems to be well suppressed on the syn
...85 % of the message is already through, i.e. 0.7 dB missing. So far no problems. I hope there will be no interruption of the PSK again. The PSK can be followed at http://www.iup.uni-heidelberg.de/
Copied "THIS IS THE FIRST SMS SENT OVER VLF BY RADIO AMATEURS. THANKS TO PAUL NICHOLSON, DL4YHF AND DF6NM FOR SOFTWARE DEVELOPMENTS. JOIN IN THE EXPERIMENTS! 73, DK7FC" Rank 0, constant reference pha
Hi Jacek, Hmm maybe you can build a RX loop and build a software cardioid to get some gain?! 8.27 kHz could be enough far away from the mains QRM... 73, Stefan Am 25.05.2017 22:12, schrieb Jacek Lipk
Hmm maybe you can build a RX loop and build a software cardioid to get some gain?! 8.27 kHz could be enough far away from the mains QRM... my antenna is in the middle of Warsaw. i live in an old soci
Hi Paul, I wonder why the reference phase was constant, because we used day and night for the transmission. Do you stop the decoder when you get a valid result or do you let it run until the process
I wondered that too so I let the decoder run the full phase search, with no better result. I also tried the amplitude and power normalisation trick but that didn't improve the result either. -- Paul
Am 29.05.2017 20:02, schrieb Paul Nicholson: I also tried the amplitude and power normalisation trick but that didn't improve the result either. I thought a bit about noise cancelling techniques. You