>Without undoing the modulation, the signal is spread over a bandwidth
>of about 0.125Hz and is completely invisible.
I believe the word 'undoing' should be omitted?
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Paul Nicholson
>Sent: Tuesday, January 06, 2015 1:01 PM
>To: [email protected]
>Subject: Re: VLF: Transatlantic messages at 8822Hz
>
>
>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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