Congrats Stefan and DL0AO team,
Very nice results, well done.
73, Jim AA5BW
From: [email protected] <[email protected]>
On Behalf Of DK7FC
Sent: Sunday, August 4, 2019 7:32 AM
To: [email protected]
Subject: VLF: QRSS-240 at 5170 Hz
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)
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