Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

from [Paul Nicholson] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: Paul Nicholson <[email protected]>
Date: Tue, 15 Nov 2016 07:18:37 +0000
Dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:To:References:Reply-To:Subject:Sender:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=a/Yl6vzDcQxA+wvXjjLiwprSbOv1abGYNzk9zJmxH3w=; b=TTZiEfBHvhXmvmkuOP6oDw89TJ PUI2rx3/oZmM7JGyK6mNun5YIbCO6WUnw2UILf72awr+izj4oZnoFBG2braIGc0D3719/DZRoNFNz wHNG7ZosPOQ76FBOVqrUrc2zMBnne9V8xQvBTE2Rbu9Jg3jzEMRKDAMqYcYKowBoj9Fk=;
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 

Message 'DK7FC JN49IK 73' from Oct 7th
16K25A with 80 second symbols,
Eb/N0 = +1.1dB  BER 37.4%.

Carrier (after phase modulation reversed) in 6uHz bandwidth

 http://abelian.org/vlf/tmp/161115a.gif

Amplitude corresponds to 1.5 electron charges on the
E-field antenna.

The reconstructed carrier doesn't even show up in a
spectrogram in the bandwidth of the 80 second symbols

 http://abelian.org/vlf/tmp/161115b.gif

I find it fascinating that the Viterbi decoder, working in that
same bandwidth, is able to extract a message from the invisible
signal.

Have to increase the frequency resolution by a factor 10 before
the carrier can be seen by eye,

 http://abelian.org/vlf/tmp/161115c.gif

--
Paul Nicholson
--
[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  [no subject], Alex K
Next by Date:  LF: VO1NA opds32 in km07ks last days, Dionysios Vlachiotis
Previous by Thread:  Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz, Paul Nicholson
Next by Thread:  Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz, DK7FC
Indexes:  [Date] [Thread] [Top] [All Lists]