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| To: | rsgb_lf_group@blacksheep.org |
|---|---|
| Subject: | Re: VLF: Transatlantic messages at 8822Hz |
| From: | Paul Nicholson <vlf0403@abelian.org> |
| Date: | Tue, 06 Jan 2015 12:01:13 +0000 |
| In-reply-to: | <54ABA271.9060201@abelian.org> |
| References: | <AABLLV5Q3AWPDJM2@smtpout02.vgs.untd.com> <54AB0110.3030709@abelian.org> <013401d02939$14569e40$3d03dac0$@comcast.net> <54ABA271.9060201@abelian.org> |
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I made a spectrogram from the reconstructed carrier (the BPSK modulation removed by undoing the phase reversals). http://abelian.org/vlf/tmp/150106a.png The bin bandwidth is set to the bandwidth of the information bits. I think this demonstrates quite dramatically the strength of the forward error correction coding. It is remarkable and quite fascinating that 150 bits of information can be obtained error-free from that feeble looking trace on the spectrogram. Without undoing the modulation, the signal is spread over a bandwidth of about 0.125Hz and is completely invisible. -- Paul Nicholson http://abelian.org/ -- |
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