Re: LF: More EbNaut 137.777 - Dec. 3/4

[Markus Vester <markusvester@aol.com>]

VO1NA decodes in Nuernberg last night:

 

2015 Dec 3/4, 39ch 2144x0.5s

 

 UT  Eb/N0 errs rank  df
       dB             mHz

 

2000    --
2030    --
2100   1.8  607  0  -.1
2130   6.0  379  0  -.1
2200   3.0  546  0  -.2
2230  13.8   25  0  -.3
2300   9.7  167  0  -.1
2330   5.8  393  0  -.2
0000   5.7  395  0  -.55
0030   3.8  506  0  -.4
0100   1.8  609  0  -.2
0130    --               -.35
0200   2.3  581  0  -.35
0230   2.7  563  0  -.35
0300   6.1  374  0  +.1
0330   0.1  682  0    0
0400   1.3  632  0    0
0430   1.5  620  0    0
0500  -0.6  710 4574  0
0530   7.2  304  0    0
0600    --                  0
0630   2.1  591  0    0
0700   4.2  484  0    0
0730    --                -.1

There appeared to be some frequency variation, either due to propagation or oscillators. I usually started the decoder a few times with slightly different frequency offsets, keeping the one which either produced the fewest errors during the initial twelve flat-phase runs, or the best-centered peak in the spectrum-of-squares.

 

The carrier signal was often strong enough that a visual message would have been readable off my TA grabber, corroborating the conclusion that EbNaut produces QRSS-3-like throughput from a QRSS-30 signal strength. On the other hand, around 23 UT the carrier was well visible on my wideband display - at 13.8 dB Eb/N0, the indicated Shannon capacity was 11615.8 bits/hour, equivalent to reading 34 letters-per-minute CW from a QRSS-3 signal.

 

Best 73,

Markus (DF6NM)

-----Ursprüngliche Mitteilung----- 
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 3 Dez 2015 10:47 pm
Betreff: Re: LF: More EbNaut 137.777 - Dec. 3/4

After some CPU-sweat, the first decode happened after 21 UT: Eb/N0 1.8 dB, 607/2144 bit errors, rank 0.

 

39 characters in just under 18 minutes - not too bad ;-)

 

73, Markus

-----Ursprüngliche Mitteilung-----
Von: jcraig <jcraig@mun.ca>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 3 Dez 2015 8:58 pm
Betreff: Re: LF: More EbNaut 137.777 - Dec. 2/3

 
I'll try a longer message 39 characters, shorter symbols 0.5s and
8K19A starting 2000 UT.

73
Joe VO1NA