On my VLF stream server I'm using the following pipeline to
extract Joe's signal and mix down to baseband I/Q:

 vtread -T2017-12-21_21:00,+32700 /raw1/vlf38 |
    vtfilter -h bp,f=8270,w=3000 |
    vtblank -a12 -d0 -t100 -v |
    vtmult -f 8270.0075 |
    vtresample -r 240 |
    vtresample -r1 > vo1na-21w.vt

and then decode with

 vtraw -oa vo1na-21w.vt |
   ebnaut -dp16K21A -r1 -S60 -k8 -PS -L500 -N1 -v

to give Eb/N0 +1.0 dB at rank 5, S/N -36.58 dB in 1Hz.

This signal has been through a stage of vorbis compression
as it was uploaded in real time to the stream server.

I wonder what Eb/N0 and S/N is obtained when Jacek runs the
extract from his local raw storage?

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Paul Nicholson
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