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VLF: QRSS-240 at 5170 Hz

To: [email protected]
Subject: VLF: QRSS-240 at 5170 Hz
From: DK7FC <[email protected]>
Date: Sun, 04 Aug 2019 13:31:45 +0200
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In-reply-to: <[email protected]>
References: <[email protected]om> <[email protected]>,<[email protected]> <[email protected]cal> <[email protected]>
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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

Attachment: 73_5170Hz_QRB57.6km.jpg
Description: JPEG image

Attachment: 73_5170Hz_QRB283km2.jpg
Description: JPEG image

Attachment: 73_5170Hz_QRB283km.jpg
Description: JPEG image

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