DIGI MODES Fall asleep over the keyboard Go for Xmas Dinner Go down the pub and get drunk Sleep for a week Little does he know that the magical black box spawns radio waves no more! The collector cu
Hello I've made a small patch to use Paul's excellent vlfrx-tools with direct sampling mode on RLT2832 DVB-T dongles. This is a nice cheap option for a remote VLF/LF/MF receiver, just keep in mind th
Hi Uwe, I've tried to decode it, but with no luck. Maybe the time synchronisation on my side is not good enough (only ntp at the moment). However after the transmission there was a long carrier (prob
Hello, Why not try it another way: in software upconvert the audio to 20kHz (or 40kHz if you have a 96kHz sound card), mix up to 136kHz or 472kHz and filter out the remaining sideband which is 40kHz
Having true baseband as an intermediate step is useful for other bands - in particular 24GHz where several types of off the shelf surplus equipment already has an image cancelling mixer, just needin
I'm often thinking about the old VLF propagation graphs https://dl.dropboxusercontent.com/u/19882028/VLF/fig_02_25a.png (what was the original paper where it comes from?) which make more and more se
just turned on spectrum lab (hope this is not an artifact, we'll see then the signal runs for a while). this is with 357uHz fft bins. jacek Attachment: 20170117_1.png Description: PNG image
ok, seems my previous results were too good to be true :) the signal is synchronized via 1pps on the other channel of the sound card and there is some crosstalk between these channels. when zooming o
Are you really sure? The signal generator is turned off? I can hardly imagine that the signal is so strong. Does the carrier disappear since 22:30 or 23 UTC? i was quite sure (until i didn't zoom out
Stefan's signal in 46.3 uHz bins, 6 hours of signal starting from 20170127 20:00 UTC. QTH is Warsaw/Poland. Analysys is done using Paul's wonderful vlfrx-tools. The sound card is locked to GPS. VY 73
Signal at 8269.995Hz in 46.3 uHz bins, 12 hours of signal starting from 20170129 00:00 UTC. QTH is Warsaw/Poland. Not sure who's signal this is (i think Uwe's?). VY 73 Jacek / SQ5BPF Attachment: 2017
Nice decode here for your transmission on 13 Fen 2017 20:40 found rank 0 ber 3.0469e-01 Eb/N0 10.7 M -1.697070885e+01 [XX] ps [ 0 0 0 0 0] carrier phase: 5.3 carrier Eb/N0: 10.9 carrier S/N: 21.44 dB
Stefan Fine decode again from your 20170215 transmission: found rank 0 ber 2.6562e-01 Eb/N0 5.5 M -1.785849953e+01 [DL-RU] ps [ 0 0 0 0 0] carrier phase: 4.2 carrier Eb/N0: 4.7 carrier S/N: 19.27 dB
Yes, the whistlers are amplified in the magnetosphere by wave particle interaction. do you need any particular polarisation to couple to the magnetosphere? Bielefeld is, as usual, well placed for th
I wonder if Jacek, Eddie or Stefan might have been able to decode this one as well? Unfortunately i've had some technical problems, and couldn't record the signal, so i can't attempt a decode. Now i
Last night the noise was similar to overnight 13th/14th. So yes, maybe you have gained 3dB. thanks for the anylysis Paul! i was just about to write you an email how to do it (especially how to estim
