Re: LF: 8270Hz

[Paul Nicholson <vlf0403@abelian.org>]

Uwe wrote:

> start 2016-03-14 03:00:00
> coding 8K19A
> CRC16
> period 10.0
> chars 19
> duration 03:17:20:00

Got that one.  Eb/N0 = 1.2dB calculated from 31.3% BER.
Measured carrier S/N gives Eb/N0 = 1.2dB also.

Constant phase.  Decode time 13 seconds.  55% of channel
capacity.

The S/N corresponds to -53dB in 2.5kHz bandwidth after
sferic blanking.  Somewhere around -70dB before the blanker.

A nice result Uwe!

Here's the symbol error map for that message

 http://abelian.org/vlf/tmp/160314a.gif

Each red line represents a symbol error.  The errors look
quite evenly spread.  I was wondering if the tail end of the
signal was caught by the dawn terminator and it looks like it
suffers a bit in the last 200 symbols.

> can I get somehow your 8270Hz .WAV file from today
> 02:59:00 to 06:18:00 ?

No problem, I'll produce a wav file, I guess the header
needs to be set up for ebnaut-rx.

--
Paul Nicholson
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