Re: LF: EbNaut on MF

[Markus Vester <markusvester@aol.com>]

Nice going Paul...

 

start   carr.  sym.
  UT    dB      dB
22:30   (garbage)
23:00   7.1   6.1

23:30   9.3   8.4

...

 

The reconstructed carrier vs. symbol error dB difference may perhaps be attributable to the phase variations, seems to be less now. Also note that tonight all my recordings are a little late, lacking the first 30 seconds of each sequence.

 

I looked at some of Domenico's files from here but didn't manage to extract any of your signal or carrier pieces. Dom is also running an updating spectrogram https://dl.dropboxusercontent.com/s/fsjkfuhggozzv5w/grabber.jpg, but there's currently nothing except a slightly drifting QRM carrier near 477698.

 

Need to go to bed now, but file saves will continue overnight for more from you and possibly Joe.

 

All the best,

Markus

 

 

 

-----Ursprüngliche Mitteilung----- 
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 15 Feb 2016 12:02 am
Betreff: Re: LF: EbNaut on MF

 
Thanks very much Markus. 
 
I'm surprised the signal is so strong and I would guess 
that Domenico has a good chance to decode. 
 
Eb/N0 from symbol errors is consistently about 3dB below the 
carrier S/N for some unknown reason. 
 
Transmitter back on from 22:24, messages begin XX:30 and XX:00 
lasting 848 seconds with unmodulated carrier in between. 
DC input this evening has been around 45W, less than 
yesterday but the tx is more efficient now.   I rewound some 
coils and replaced the unsuitable caps I was using to tune 
the antenna. 
 
EbSynth seems to be performing as expected with a -h9 option. 
 
It's making a mess of VLF E-field reception so I won't be doing 
much more of this! 
 
-- 
Paul Nicholson 
--