AW: Re: LF: 8270Hz

[uwe-jannsen@kabelmail.de]

yes, Paul, it was chars 19.
Uwe

 

Von: Paul Nicholson <vlf0403@abelian.org>
Gesendet: 12.01.2016 21:36
An: <rsgb_lf_group@blacksheep.org>
Betreff: Re: LF: 8270Hz

 

Uwe wrote:

> 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

That should be 19 chars.

I spent 3 days trying to decode, but without success.
The following carrier measures 16.4 dB in 1 hour and
that should give me Eb/N0 around 0.1 dB which has a good
chance of decoding. But for some reason it doesn't
decode. Maybe the signal was a dB or so weaker than the
following carrier. It must have been very close to the
limit. Or perhaps the symbol timing is a bit out.

Also I used all of your recent long carrier transmissions,

2015-12-30_00,+6h
2015-12-30_20,+11h
2016-01-01_00,+7h
2016-01-05_00,+7h
2016-01-06_00,+7h
2016-01-09_20,+11h

and tried a 49 hour integration, non-coherent in 278 uHz,
using signal recorded by Mike Smith at Forest Virginia,
but nothing showed above noise. The west-to-east path
is going to be a tough nut to crack, especially across
6667 km.

Mike is contemplating building a loop receiver similar to
mine which will help by maybe 6dB or more.

Really, someone should be looking for this carrier in
Canada or Newfoundland. That has a much better chance.

--
Paul Nicholson
--