Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

RE: VLF: Transatlantic messages at 8822Hz

To: <[email protected]>
Subject: RE: VLF: Transatlantic messages at 8822Hz
From: "Clemens Paul" <[email protected]>
Date: Tue, 6 Jan 2015 13:12:56 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AdApqM1WP/S0S+MfSZmG+ZO+8J4TlgAARgvA
 >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/
>--
>


<Prev in Thread] Current Thread [Next in Thread>