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Re: VLF: 300 mA on 5170 Hz

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: 300 mA on 5170 Hz
From: DK7FC <[email protected]>
Date: Fri, 20 Oct 2017 15:50:33 +0200
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...there have been some thunderstorms again last night in a range of < 2000 km. Arround 3 UTC the cancellation effects were quite expressed. Within 200 Hz or so, the SNR can change by 10 dB. It looks like the dSNR/df is most expressed in the range arround 5 kHz.
A working propagation model would be useful for us. So far we can just try to experiment with multi frequency carriers to get an impression.

Let's try a short message at night. Maybe it is a bit to optimistic to expect that it will be decoded by Alex. But why not. We learned that the impossible is possible. I'm not sure about the stability of the antenna current during rain, we will see...

f = 5170.1000 Hz
Start time: 20.October.2017  16:00:00 UTC
Symbol period: 90 s
Characters: 1
CRC bits: 4
Coding 16K21A
Duration: 12h
Antenna current: 300 mA

73, Stefan

Attachment: propVLF.jpg
Description: JPEG image

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