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Re: ULF: First EbNaut message over > 1 wavelength on ULF

To: [email protected]
Subject: Re: ULF: First EbNaut message over > 1 wavelength on ULF
From: Paul Nicholson <[email protected]>
Date: Wed, 25 Jan 2017 18:30:50 +0000
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Stefan wrote:

> Well, so far 3 characters passed over 3 wavelengths.
> Let me try 5 tomorrow!:

> f = 2970.000000 Hz
> Start time: 25.Jan.2017   07:00:00 UTC
> Symbol period: 30 s
> Characters: 5
> CRC bits: 16
> Coding 16K25A

Decoded at Bielefeld via DL4YHF (303.8km).  Copied 'DK7FC' with
Eb/N0 +4.5 dB and constant reference phase.

S/N 19.1 dB in 29.8 uHz, -60.1 dB in 2.5kHz.

I'm still working on the recordings from the weekend.  Gained a further
3dB by using very strong hum filtering, a threshold only 1.5 times the
mean amplitude and narrow notches.  Enough to suppress not just the
harmonics but also the sidebands of the harmonics.   Still no trace
here in Todmorden - yet.  Still some permutations of polarisation
and azimuth to try.

Earlier, stefan wrote:

> What do YOU need to get a first trace of my signal
> in the UK?

A daytime thunderstorm near Heidelberg would do nicely.
I can use the sferics to measure polarisation and E/H ratio.
That leads directly to an optimum antenna mix.

> We are writing radio history, a bit, at least it feels a bit
> like that in the moment.

We are having fun with this!  Constantly pushing at the limits.

Paul Nicholson

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