From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: Re: LF: NA VLF
Thread-Index: AQHSyJRzH24LC+DcQE6j3qgyhEHuQ6HrrIrA
Date: Tue, 9 May 2017 08:36:38 +0000
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In-Reply-To: <15bec0dde4e.marcocadeddu@tin.it>
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Subject: RE: Re: LF: NA VLF
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Congratulations !

Really amazing techniques :-O

Add accurate tracking of a (small) dish, and accurate doppler compensation and you will be able to
detect the Voyager1 in 8.4GHz ;-)

73 de Luis
EA5DOM


-----Mensaje original-----
De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de marcocadeddu@tin.it
Enviado el: martes, 09 de mayo de 2017 9:13
Para: rsgb_lf_group@blacksheep.org
Asunto: R: Re: LF: NA VLF

Hi Joe!
compliments for the amazing result!
It is really amazing what you are doing on both side of the pond!

73 Marco, IK1HSS

----Messaggio originale----
Da: jcraig@mun.ca
Data: 8-mag-2017 22.39
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: LF: NA VLF

Thank-you Paul.  Your RX setup and processing are fantastic.
2.6 electrons on an e probe -  that delights me!

EbNaut and 100 uW are the next goals.

73
Joe

On Mon, 8 May 2017, Paul Nicholson wrote:

>
> Watson-Watt calculation from the antenna amplitudes and phases of the 
> overnight signal gives 244 degrees which is reasonable given the 
> background noise from the south west (pulling the apparent bearing 
> southwards from the great circle 280 deg).
>
> Without any calculation, I can see from the relative antenna phases 
> that the signal is from the west: the E/W H-field is very obviously 
> inverted (relative to the E-field) from its familiar polarity on 
> European signals.
>
> Joe wrote:
>
>> The carrier was generated with an undisciplined 10 MHz DOCXO clocking 
>> an ad9851. As Markus points out, the maths puts it high by 92.5 uHz.
>
> Overnight signal peaks at 8270.0070625 Hz +/- 0.5 uHz.
> Therefore about 3.6 ppb low of the DDS nominal frequency of 
> 8270.0070925...
>
> If I align the FT bins with that frequency, the overnight signal 
> becomes a sharp line -
>
> http://abelian.org/vlf/tmp/170508e.gif
>
> with a respectable S/N of 13.9 dB in 46.296 uHz.
>
> I'm now confident that this little peak in the spectrum is 10uW from 
> VO1NA.  Distance is 3545 km.
>
> The signal amounts to about 2.6 electrons on the E-field probe.
> How's that for a signal report Joe?
>
> Also getting a bit of a signal visible at Forest, Virginia.
> Not a very significant peak but it has the same offset.
> Only visible on the overnight signal, nothing yet on the daytime.  
> Distance to Forest is 2442 km so that's very good for a land path.
>
> http://abelian.org/vlf/tmp/170508d.gif
>
> Forest is E-field only so no rejection of the South American nighttime 
> sferics.
>
> --
> Paul Nicholson
> --
>
>