Return to KLUBNL.PL main page
| To: | [email protected] |
|---|---|
| Subject: | Re: VLF: Transatlantic messages at 8822Hz |
| From: | Paul Nicholson <[email protected]> |
| Date: | Tue, 06 Jan 2015 12:01:13 +0000 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 |
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/ -- |
| Previous by Date: | VLF: 8270 carrier, Markus Vester |
|---|---|
| Next by Date: | RE: VLF: Transatlantic messages at 8822Hz, Clemens Paul |
| Previous by Thread: | Re: VLF: Transatlantic messages at 8822Hz, Paul Nicholson |
| Next by Thread: | RE: VLF: Transatlantic messages at 8822Hz, Clemens Paul |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
