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Re: VLF: VO1NA in Todmorden on 8270 Hz - also in Amberg?

To: [email protected]
Subject: Re: VLF: VO1NA in Todmorden on 8270 Hz - also in Amberg?
From: Paul Nicholson <[email protected]>
Date: Mon, 6 Nov 2017 13:33:45 +0000
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Neither component decoded by itself:

 H-field: Eb/N0 -1.5dB  phase 40.3  (no decode)
 E-field: Eb/N0 -0.9dB  phase 35.3  (no decode)

The noise was just a little higher than average for the time
of year.  On an average night we might gain another dB of S/N.

A strong EbNaut signal on almost the same frequency from a local
station was not a problem - almost opposite beam headings.

I couldn't improve the result by playing around with the E/H mix,
so it looks like the rough E-field cal I'm using is fairly good.

Joe wrote:

> Will do a repeat transmission tonight.

Perhaps try a longer message and stronger code.  It looks like
the band will support an earlier start time and later finish.

Eg

 cat msg7 |
   ebnaut -et -N8 -k20 -p16K21A |
   sudo ebkey -S21 -m rp,gpio=23 -T '20171106 2200'

This uses a -k20 option to give a 20 bit CRC. Should still decode,
easily if it's an averagely noisy night.

--
Paul Nicholson
--

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