Re: LF: Testing EbSynth on LF

[Michel Brunel <f5wk@mterrier.net>]

Hello Domenico,

received so far with Paul's vlfrx-tools:

20:00 UTC
vtread -T2017-02-08_20:00:00,+900 ./ | vtmult -f 1495 | vtresample -r 240 | vtraw -oa | ebnaut -d -N12 -p 8K19A -S1 -r240 -c2 -L20000 -PS  -T0 -F0.000626
found rank 0 ber 9.7877e-02 Eb/N0 10.2 M -1.569956207e+02 [73 DE IZ7SLZ] ps [  0    0    0    0    0]

20:30 UTC
vtread -T2017-02-08_20:30:00,+900 ./ | vtmult -f 1495 | vtresample -r 240 | vtraw -oa | ebnaut -d -N12 -p 8K19A -S1 -r240 -c2 -L20000 -PS  -T0 -F0.000626
found rank 0 ber 0.0000e+00 Eb/N0 70.9 M -2.899937134e+02 [73 DE IZ7SLZ] ps [  0    0    0    0    0]

21:30 UTC
vtread -T2017-02-08_21:30:00,+900 ./ | vtmult -f 1495 | vtresample -r 240 | vtraw -oa | ebnaut -d -N12 -p 8K19A -S1 -r240 -c2 -L20000 -PS  -T0 -F0.000626
found rank 0 ber 4.1274e-02 Eb/N0 12.7 M -1.574096375e+02 [73 DE IZ7SLZ] ps [  1  180  180  180  180]


Now I'm using a rubidium reference (10 MHz) not the GPSDO anymore. The 1PPS for the sound card is derived from the rubidium as well. 
This requires an initial sync from a GPS 1PPS to align the rubidium 1PPS to UTC. 
The 626 µHz frequency adjustment (calculated)  compensates for the receiver's DDS real frequencies

73,

Michel - f5wk  JN18HP


Le mercredi 8 février 2017 à 19:54:35, IZ7SLZ écrivait :

> Hello LF,

> i'm testing EbSynth, the linux application of Paul Nicholson

> http://abelian.org/ebnaut/ebsynth.shtml

> using a small PC with Ubuntu.

> I want to test the EbSynth modulator by sending some EbNaut messages 
> tonight starting at 19.00 every 30 minutes.

> Message contains 12 characters coded with p=8k19A sent at 1s/sym. QRG is 
> 137495 Hz

> Reports are welcome.

> 73, Domenico iz7slz






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