Re: LF: More EbNaut 137.777

[Andy Talbot <andy.g4jnt@gmail.com>]

Good point, never thought about the .TXT file  !

Noise levels seem to have risen here, no more decodes since that original one.  I've always thought this urban site is poor for LF Rx, hence have tened in teh past to put up beacon signals for others to listen to.    Its novel being a listener for once/

Bed time is calling now...

I'll modify the prog to record multiple timed sessions - so will be able to leave it running overnight unattended then.   The other option would be to write a prog that carves up one continuous .WAV file into segments based on specified time slots.

Do like the idea of running multiple parallel sessions with different time offsets.   Does that make it into a  RAKE receiver ?

Andy  G4JNT

On 26 November 2015 at 21:49, Markus Vester <markusvester@aol.com> wrote:

Too late for 20:00, nil of 21:30, but then a good one at 21:00, +1.3 dB, 1.2s offset.

> I run 10 copies of the decoder in steps of 0.2 seconds
... Prx > Ptx ? ;-)

 

>There is a faint trace visible on the waterfall at the moment

Andy your spectrogram nicely shows the 0.5 Hz wide "noise hump" from the modulated transmission, so the signal is still relatively strong for you. 

 

> How can I make a copy of the text in the EbNaut window ?

All info on the decodes will be in the xxx-log.txt file.

 

BTW Under Windows 8 or 10, the show_rawsyms3a utility sometimes froze on exit. Fixed with version 3b in http://df6nm.bplaced.net/VLF/fec_tests/df6nm_ebnaut_utilities.zip

 

Good luck and have fun,

 

Markus (DF6NM)

 

 

 

-----Ursprüngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 26 Nov 2015 9:52 pm
Betreff: Re: LF: More EbNaut 137.777

 

Message: 5 chars 

Coding: 8K19A 

Symbols: 512 at 2 seconds each 

Duration: 1024 seconds, 00:17:04.00 

 

Best decode here is at T offset +0.8 

Eb/N0=5.4 phase 150  150  180  180 

 

I run 10 copies of the decoder in steps of 0.2 seconds 

and grep the log files. 

 

-- 

Paul Nicholson 

--