I get them here too occasionally - but I dont know if they are assosciated with the AC PLC using "Turtles" which produce constant circa 2Hz clacking noises on LF and MF up to 1.6MHz
> Date: Thu, 20 Dec 2012 14:57:35 -0330
> From:
[email protected]> To:
[email protected]> Subject: Re: LF: Horray!!
>
> Thank-you Markus,
>
> Yes, these little dashes are strange aren't they? Perhaps someone
> on the Reflector could enlighten us. They were quite strong on
> an argo plot from the night before.
>
> 73 Joe
>
>
> On Thu, 20 Dec 2012, Markus Vester wrote:
>
> > Joe, Stefan, well done both!
> >
> > Joe I'm still curious about the many short dashes in your wspr spectrogram, which look like some multitone data transmission. Could those be some form of powerline communication?
> >
> > Best 73,
> > Markus
> >
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