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Re: VLF: EbNaut message announcement @ 5170

To: [email protected]
Subject: Re: VLF: EbNaut message announcement @ 5170
From: Markus Vester <[email protected]>
Date: Sat, 16 Mar 2019 19:24:49 +0000 (UTC)
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aol.com; s=a2048; t=1552764292; bh=SVEpM14tQqBqt14+p0FY5pO7Y5s6m1dI72w7BtFjGg4=; h=Date:From:To:Subject:References:From:Subject; b=MVyBJrayITdWnycDy7a6+9dY5tuEyI9SP6fFVVU7A2z0ioVzjLjZ6Rw2SmtD9fNHq55WZV+rrEBvBtccGXpzSBGnR9a2obs4u0wo/Fj+4l0ZTSmr/m7iH+Xy35mAo4Hs+UznoHCaWdKfUL07N7/Tbta8COtwGi2KOR4P+GfO9lQqV1s0QDn6+TG4xNmY7LMFxWgJweJu/BONeX7W+j/SQsLAftaT2lfJVWwK4dXpDt25jlY1QP+FQWZwx1IVecIxsjAY14MxfjgowYaTqdRpReVyhtvpHVf7IPr+umGB2VNVhRVVtbtyFpuemI4MNApuDHEF+fvwsok+5C/usHpKPg==
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
A perfect and obviously correct decode from DL0AO.

Eb/N0 from EW earth loop:
12.3 dB (carrier), 12.3 dB (symbol err.)

Eb/N0 from E-field:
12.1 dB (carrier), 11.9 dB (symbol err.)

Eb/N0 from cardioid (180° sum, H-E):
14.7 dB (carrier), 14.5 dB (symbol err.)

Best 73,
Markus



-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 16. Mrz 2019 15:56
Betreff: Re: VLF: EbNaut message announcement @ 5170

Hello Markus and Paul, VLF,

Many thanks for the feedback. What a great result!
Paul, after the EbNaut transmission i sent '73' in DFCW-90, which is a typical mode for LF operation. Do you see the message in a spectrogram, like Markus did at DL0AO? Best setting may be something like 20 mHz and 10 sec/pixel.

On my tree (meanwhile shutdown because the old accu is empty!) the E field is still not really usable but the loops work very well on that frequency. Mixing both loops and optimising the settings gives carrier S/N: 48.05 dB in 282.5 uHz for the carrier transmission!
So i could see a clear trace from a 1 W transmitter!

I'll produce a spectrogram from the postprocessed data...

Maybe Jacek got something too? :-)

73, TNX, Stefan


Am 16.03.2019 15:29, schrieb Paul Nicholson:

Stefan wrote:

> The carrier is now running since 09:31 UTC at 5170.1 Hz.

Enormous signal here -

 http://abelian.org/vlf/tmp/190316a.png

S/N 33.6 dB in 278uHz, -2dB in 1Hz, -36dB in 2.5kHz.

> Message:
> *f = 5170.1 Hz

> Symbol period: 2 s
> Characters: 14
> CRC bits: 14
> Coding 16K21A

> start at 10:30:00.3 UTC.

Decoded rank 0 BER 8.9% constant reference phase.

carrier Eb/N0: 10.3 dB
carrier S/N: 29.3 dB in 264.8 uHz, -6.5 dB in 1Hz, -40.5 dB in 2.5kHz

--
Paul Nicholson
--

Attachment: sum_sym.png
Description: PNG image

Attachment: sum_result_hidden.png
Description: PNG image

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