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

[DK7FC <selberdenken@posteo.de>]

Hi Paul,

I got the message with just one error, see attachments. So the system 
seems to work well...
Looking forward to the next test starting 6 UTC.
I can't decode 16K25A messages, so its up to you.

73, Stefan

Am 12.10.2016 21:35, schrieb Paul Nicholson:
> > f = 6470.00000 Hz
> > Start time: 12.10.2016   14:30:00 UTC
> > Symbol length: 40 s
> > Characters: 3
> > CRC 16
> > Coding 8K19A
>
> No decode, just a false hit ' WV' at Eb/N0 = -0.7.
>
> Strange.  According to carrier measurements this should
> be an easy decode at around +3db.
>
> More carrier measurements: night signal phase lags daytime
> by 60 degrees.  Night amplitude is about 0.1 fT.
>
> The 16K25A 15 char 140 second message should decode at
> about Eb/N0 +6dB.   So far no improvement on the partial
> decodes, next to try is correcting for that 60 deg diurnal.
>
> --
> Paul Nicholson
> --

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