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Re: VLF: 300 mA on 8270 Hz

To: [email protected]
Subject: Re: VLF: 300 mA on 8270 Hz
From: DK7FC <[email protected]>
Date: Sat, 30 Sep 2017 22:16:22 +0200
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Hello Paul,

Just excellent! I'm most impressed, although we already put longer messages through.
And i'm curious about the lower frequencies.

100 transmit hours are over now, and it is raining strongly in the moment BTW.
You said a day time carrier can be helpful to calibrate your E field
antenna. Even that relatively low signal with 300 mA?
If so, i would continue to transmit until tomorrow evening.

73 and TNX for the experiments.

Stefan


Am 30.09.2017 21:59, schrieb Paul Nicholson:
Stefan wrote:

> f = 8270.005000 Hz
> Start time: 27.September.2017  06:00:00 UTC (daily)
> Symbol period: 8 s
> Characters: 100
> CRC bits: 16
> Coding 8K19A

Decoded

 "NIEMAND IST MEHR SKLAVE, ALS DER SICH FUER FREI HAELT,
  OHNE ES ZU SEIN. _ JOHANN WOLFGANG VON GOETHE"

List rank 0, Eb/N0 = +0.7 dB with four days stacked.
I used a 'known phase' decode, using the average phase 136.8 deg
of the recent 16K21A 12 char messages.

It would not decode from the first 3 days, even up to list length
of 23e6 which is the largest my workstation will do.

I'll start a uniform phase decode to see if I can improve the
decode.

--
Paul Nicholson
--





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