Make it 8000Kms :-)
Laurence KL7UK
> Date: Fri, 29 Oct 2010 19:09:34 +0200
> From: [email protected]
> To: [email protected]
> Subject: Re: LF: vlf experiments-numerical considerations
>
> Hi Jacek,
>
> Could you create a picture like plot_80km for distances up to 5000km? I
> think i do not want to start simulating, my job is in the field ;-) But
> you have done it and may generate it easily?
>
> This all is very interesting but i wonder if there are not significant
> propagation differences between the way the waves have to travel (flat
> land, sea, alpes, poles...!)
> E.g. Renato Romero has an excellent RX down to DC but my S/N at his
> location was rather poor (compared to other RX stations). So, is it the
> local QRN that may be a little more in the south or maybe due to the
> alps? The S/N between 8970 and 6470 was about the same, as at other
> locations too.
> What do the experts think could be the difference between these differnt
> traveling ways?
>
> 73, Stefan
>
>
>
>
> Am 29.10.2010 14:58, schrieb Jacek Lipkowski:
> > this is a nice plot showing field strength vs frequency and distance,
> > calculated from Piotr's code. please notice that for a given distance
> > there are two frequencies which yield the highest field strength for a
> > constant antenna current - see the second plot, calculated for 904km
> > distance (my distance from DK7FC :)
> >
> > btw, Piotr's code is very fast!
> >
> > i made a slightly modified version to include calculating of multiple
> > values, and some additional stuff (compiling via gfortran, a makefile,
> > ploting the data via gnuplot etc). it was used to make these graphs. i
> > can post it if anyone is interested
> >
> > VY 73
> >
> > Jacek / SQ5BPF
>
=
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