Re: ULF: EbNaut transmissions on lower frequencies?, pre-tests

[DK7FC <selberdenken@posteo.de>]

That's perfect Paul! Thanks for the decode. The error map is astonishing 
clean!
So 200s symbols to 30s symbols that's 8 dB and without the 6 dB QRP, 
here we are: 14 dB :-)
Still some things to prepare for next tests. Need to finish the usage of 
'Oskar' now, because it wil be much easier to add the remaining 2 
yoghurt cups on the coil to get more L.
I thought about the old times and the 46 km band. Not only i have been 
on 6.47 kHz these days, if i remember correctly it was DF6NM and OE5ODL 
as well. I would like to come back to that band for some tests. Maybe we 
can see a first tendency of advantages / disadvantages.
73, Stefan

Am 03.05.2016 07:34, schrieb Paul Nicholson:
> Stefan wrote:
>
> > 130 mA
> > f = 8270.1 Hz
> > Start time: 01.05.2016   15:00:02 UTC
> > Period: 200 s
> > Length: 5
> > CRC 16
> > Coding 8K19A
>
> Copied 'VLFDX'
>
> Reference phase: constant
> Eb/N0: +5.4 dB
> BER: 26.8 %
> Carrier: S/N: 19.77 dB in 9.8 uHz
> Error map: http://abelian.org/vlf/tmp/160502a.gif
>
> I am seeing the expected 6dB signal reduction
> at the lower antenna current.
>
> --
> Paul Nicholson
> --