LF: 8270Hz

[uwe-jannsen@kabelmail.de]

Carrier on: 2016-01-09 17:00:00

Message start: 2016-01-09 17:05:00

Coding 8K19A

Duration 02:37:52:00

Chars 10

Bits 1184

Period 8,0

 

The carrier is still on the air.

 

Paul, is it decodeable?

 

Von: uwe-jannsen@kabelmail.de
Gesendet: 06.01.2016 15:48
An: <rsgb_lf_group@blacksheep.org>
Betreff: AW: Re: LF: 8270Hz

 

during transmissions were vy deep dark clouds around and some snow coming down.
could that be the reason for the phase irritations?
Uwe

 

Von: Paul Nicholson <vlf0403@abelian.org>
Gesendet: 06.01.2016 12:10
An: <rsgb_lf_group@blacksheep.org>
Betreff: Re: LF: 8270Hz

 

Uwe wrote:

> Coding 8K19A
> Start 2016-01-04 22:45:00
> Period 10
> Duration 01:25:20:00
> Chars 5

I got

found rank 4044817 ber 4.0625e-01
Eb/N0 -3.0 M -8.368480206e-02 [DJ8WX]
ps [ 4 -30 -30 -30 -30]

This counts as a detection, not a decode because it was not
the most significant output from the list decoder. In fact
it was the 22nd lowest and I had to use a list size of 5 million
to find it. Eb/N0 was -3dB with BER 40.6% which is not
decodable.

I suspect something is happening with the phase at around that
time of night, maybe a reversal. That would explain the failure
of 'WX' the other day. I need to do a bit more work to
investigate.

--
Paul Nicholson
--