First I thought it was a lack of receiving conditions here.
But the noise band also appeared on WebSDR Delft.
Some Googling it appears this to be a NATO test transmission for Marine
data.
Doc found on www.ero.dk attached.
Strange they test it here, where MF is rather stable and not in static
area (arnd equator... Singapore!), where 500kHz most of the time is useless.
Jan/pa3abk
Op 2-11-2010 7:51, Lubos OK2BVG schreef:
Hello John, LF!
Thanks for interesting information below. I can see the wideband data
noise on the SpectrumLab often. It is the reason, why I have to use a
new favourite freq for transmitting, 502,300kHz (insteed 501,888kHz).
If the conditions are good, then the noise is very good visible. But
it is not audible here. I can see it at night only.
73!
Lubos, OK2BVG, JN88KS
******************************
> Date: Mon, 1 Nov 2010 23:37:08 +0000
> From: [email protected]
> To: [email protected]
> Subject: LF: The Wideband Noise
>
> Hello,
>
> I've had some correspondence with John G3WKL and Colin G3PSM about the
> new "commercial" wideband data noise that occupies 498-502kHz
>
> It seems to be a test of an impending data system for marine use.
>
> Colin would like some information about where, and when, it can be
> heard or otherwise detected. It appears to be being driven by the
> French.
>
> Forthe record I can hear it here in Shetland. It faded up tonight at
> approx 1615 UTC and is audible and visible on a waterfall display.
>
> I haven't been in a position to DF it, but in the first instance Colin
> would like to gather some information about where it is being received.
>
> I can collate the information for him if anyone who is affected by, or
> can simply detect, this noise/data signal could give details either
> direct, or via the LF group. I know a lot of discussion has been had
> already, but a quick note now could be useful, as there is a meeting
> soon to discuss this, and other aspects of WRC2012.
>
> Cheers,
>
> John
> GM4SLV
>
B9A92E86-56BB-4C5D-AB05-FA5A72317664.pdf
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