Hi ULF, The accu is fully recharged and i am on the hill again, transmitting on the ground loop antenna. This time, the accu has even more power. The TX power is 520 W (!), the DC measurement tells i
Hello Markus, ULF, The carrier was stopped after 2 hours (13:17 UTC). What a great result! Again i did not expect such a S/N in 424 uHz at DL0AO. The QRB is 283 km, http://k7fry.com/grid/?qth=KO02MD&
Am 30.12.2018 16:59, schrieb DK7FC: The QRB is 283 km, http://k7fry.com/grid/?qth=KO02MD&from=JN39WI Wrong link. The correct link is http://k7fry.com/grid/?qth=JN59VK&from=JN39WI 73, Stefan
Ufortunately i didn't receive anything here. Not very exciting but i believe that negative results should also be reported. The spectrograms: https://klubnl.pl/grabber/grabber_sq5bpf_2970.png https:/
Hello Jacek, Did you just look into a spectrogram or did you try to produce a spectrum peak from your data storage? Do you use the -a th=x function in vtfilter. I think i have the latest version of v
Best I can manage here is 11.9 dB S/N in 139uHz from the 9nV/m E-field signal. A little over 2 electrons on the antenna. http://abelian.org/vlf/tmp/181230a.gif The pipeline uses vtfilter -h bp,f=2470
Hello Paul, ULF, Thanks for the efforts. 11.9 dB, that sounds good. For a valid detection you said we need 14 dB SNR. Anyway, quite close and it is unlikely that it is a noise peak. Actually this is
I forgot to allow for the rx calibration, the signal was closer to 12nV/m rather than 9nv/m. You might not do very well on Renato's receiver, is has been suffering a high level of interference recent
This is the best i can do so far. Using vlfrx-tools 0.9f and vtfilter -a th=5 -h hp,f=1750,poles=8 -h lp,f=4250,poles=8 | vtblank -a25 -d0.005 -t1000 Does that count as a reception? VY 73 es HNY Jace
Hi Jacek, Are you sure the x-axis label is correct? In vtblank, you use -t1000, not -t100 ? You need to determine the carrier S/N. I usually take an EbNaut message having the same length, containing
Thanks Markus You're right! This is a nice example how one can make a false result. I will re-run the tests this evening. VY 73 Jacek / SQ5BPF On Wed, 2 Jan 2019, Markus Vester wrote: Date: Wed, 2 Ja
Hi Stefan Unfortunately no detection on 2470 and 2970 (especially after Markus noticed that i'm trying to receive the wrong frequency :). Could you try 5170 and 6470Hz? VY 73 ES HNY 2019 Jacek / SQ5B
