Hi VLF, For this week, i'm planning to start with new experiments on 17.47 kHz, where i have a (renewed) special permission to transmit. So far the best results were a prooved carrier detection as we
PS: Is there anyone else interested in VK or even ZL ? Am 20.08.2018 16:23, schrieb DK7FC: Hi VLF, For this week, i'm planning to start with new experiments on 17.47 kHz, where i have a (renewed) spe
VLF, Last night a carrier test transmission at 1.2 A antenna current went well for a few hours. Today the regular carrier transmissions start from 16...0 UTC on 17470.1 Hz. Reports welcome :-) 73, St
Thanks Paul. That would be good for the traditional QRSS-60 over our distance. Not bad at all for such a noisy summer! 73, Stefan Am 23.08.2018 06:43, schrieb Paul Nicholson: A great signal in Todmor
Hi Stefan, 17.47KHz Sorry. Too much QRM during the summer here due to Air condition, etc :( Set and spectrogram which is not yet in the grabber. Updated every 15min https://www.dropbox.com/s/jv1o0zvy
Hi Luis, thanks for trying! Eventually 42 uHz is to narrow. You could try a twice as high bandwidth, i.e. a half as long FFT window time and twice the scroll rate. 73, Stefan Am 23.08.2018 10:14, sch
Hi Stefan, Based on the past two days signal from JXN, would it improve the chance of detecting the carrier if the "FFT window time (length)" matched the time when the signal is at maximum? The FFT l
Hi Edgar, Thanks for the spectrogram showing JXN nicely! Here i'm watching NWC but the SNR is much lower, probably due to the strong QRN we still have in late August... I'm going to calculate the wei
Thanks Paul, that's cool! Quite some QSB. I assume it is rather the noise than the signal that changed. Yesterday my "should be fine for QRSS-60" was a quick mis-calculation. It must be QRSS-600. For
Hi VLF, After transmitting carriers for the last 5 days, there are 3 good days to stack, the others were noisy. The resulting SNR via start time plot for different carrier length is attached. With so
...something went wrong. The transmission stopped :-( I'm continuing with a carrier until 23 UTC. Another message attempt will start tomorrow. 73, Stefan Am 27.08.2018 15:09, schrieb DK7FC: Hi VLF, A
Hello dear VLF followers, Here's an update from the ongoing experiment. The last evenings carrier transmission greatly confirmed that 17:50 UTC is the best time to try. A screencapture is attached. I
Hi Stefan and Edgar, I am still deeply impressed by your groundbreaking work. With close to 12 dB SNR after three nights, it looks like you could chat at a rate of one character per day. The Excel pl
Hi Markus, Thank for your interest and comments. Yes, you are right, there is a second maximum which becomes more evident in the attached plot. I should have transmitted longer, until 0 UTC. Maybe it
PS: Ah, you decoded the message. That's fine because i didn't know yet if all worked well. What was the carrier S/N? 73, Stefan Am 29.08.2018 12:03, schrieb Markus Vester: Hi Stefan and Edgar, I am s
Hi Stefan, only the first half hour of the transmission was used to obtain the decode, and that was already displaying 5.9 dB carrier EbN0 in Nuernberg. So all I know is it was more than enough ;-) T
Stefan and Edgar, Best compliments on your continuing fine work. I second Markus's motion, the Excel plots are most informative... and the results are exciting [including the diurnal SNR pattern for
