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Re: ULF: EbNaut message transmitted from ground loop - also decoded in I

To: [email protected], Renato Romero <[email protected]>
Subject: Re: ULF: EbNaut message transmitted from ground loop - also decoded in Italy
From: DK7FC <[email protected]>
Date: Sun, 07 Apr 2019 16:23:13 +0200
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Last night, before starting to TX, i started a record of the VLF (0...16 kHz) streams by IK1QFK and also by SQ5BPF. During the transmission period there was no break of the streams, good.

Meanwhile the post-processing for the data file shows that the message is also decodable at IK1QFK, who is in 493 km distance,
Renatos stream is from the E field. The angle between my loop and his QTH is 54 deg, so there will be some directional loss.

Attached is a screenshot showing the processing chain and the decode result as well as the SNR, 16.09 dB!

So this transmission was also decoded in Italy which certainly is a first ULF message detection DL > I.

Thanks to Renato for providing the stream and to Paul for hosting it.

73, Stefan

Am 06.04.2019 22:39, schrieb DK7FC:
Hello Markus, ULF,

I'm now sitting in my car, TXing in the forest. It is very silent here. I can hear a faint 'crk' in the FETs when the phase toggles :-)
Getting 2.44 A now on the 1130mground loop, 487 W TX power (not as much as it could be for the planned TX time though).

Now, message parameters:

f = 2970.1 Hz
Start time: 06.APR.2019  20:25:00.3 UTC
Symbol period: 6 s
Characters: 7
CRC bits: 16
Coding 16K21A
Antenna current: 2.4 A
Duration: 02:04:48 [hh:mm:ss]

Reports welcome :-)

73, Stefan

Attachment: 2970Hz_1130m-ground-loop_EbNaut_IK1QFK_RX.png
Description: PNG image

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