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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

from [Paul Nicholson] [Permanent Link][Original]
To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Paul Nicholson <vlf0403@abelian.org>
Date: Wed, 30 Nov 2016 18:42:04 +0000
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> f = 6470.00000 Hz
> Start time: 23.11.2016 08:00:00 UTC (Daily repetition)
> Symbol length: 12 s
> Characters: 40
> CRC 16
> Coding 8K19A

Eight repeats and no sign of a decode.  I expected six repeats
would be enough.

> A phase turn of 180 deg is done by varying the frequency
> for a certain time

> PSK_Regelzeit.png

That would be significant I think.  Perhaps it costs a dB or
two.   I've tried some small time offsets.  Perhaps I can
blank the symbol transition periods and just work with
say 8 seconds of each symbol.  Something to try tomorrow.

--
Paul Nicholson
--
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