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: [email protected]
Data: 8-mag-2017 22.39
A: <[email protected]>
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
> --
>
>
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