VLF: QRSS-240 at 5170 Hz

[DK7FC <selberdenken@posteo.de>]

Here are results from the post-processing of yesterdays transmission at 
5.17 kHz. RX sites at DK7FC (tree) in 57.6 km distance and DL0AO in 283 
km distance. Mixing the two orthogonal loops at DL0AO allowed to steer 
the resulting software rotatable loop into and angle where the SNR 
became as good as it can be for that day and time. Now the message is 
completely readable in 283 km distance (4.8 wavelengths). Two versions 
of the result at DL0AO are shown, one from DK7FC.
TX site: 1130m spaced ground electrodes in JN39WI | 1.7 A antenna 
current at 370 W TX power (higher losses due to dry soil, thus less 
power from the given antenna voltage at the PA)
73, Stefan

Am 03.08.2019 18:08, schrieb DK7FC:
> BTW today i transmitted "73" in QRSS-240 at 5.17 kHz, starting 08:30 
> UTC. There was a team from a TV channel (Bayerischer Rundfunk) at the 
> VLF RX site of DL0AO and they followed the QRSS coming in on the 
> spectrogram. I hope they will report about it then...
> Unfortunately it took 1.5 hours to fix two broken wires of the 
> antenna. Afterwards the QRN already set in, so half the message was 
> lost in the noise... Anyway, the 7 is quite doubtless.
> 73, Stefan

73_5170Hz_QRB57.6km.jpg
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73_5170Hz_QRB283km2.jpg
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73_5170Hz_QRB283km.jpg
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