RE: LF: Weak 'nighttime' carrier on 472.5 kHz ?

[Lubos OK2BVG <bvgbob@hotmail.com>]

Hello Wolf, group!

Yes, I can see the signal as well. Similar signals are on 472,000 and 471,692kHz. I think, the are from distant TXs, but I don´t know their ID. I can see the signals on both my receiving stations, they are 2km distant  each to other. 

If the conditions are very well, I can see and listen to a second harm from NDB "SA" on 472,460kHz (474,500-(2x1,020)). But it don´t disturbe me, becouse it is only a poor signal, of course.   

73!

Lubos, OK2BVG

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> Date: Sun, 23 Sep 2012 21:32:47 +0200
> From: dl4yhf@freenet.de
> To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
> Subject: LF: Weak 'nighttime' carrier on 472.5 kHz ?
>
> Dear group,
> Do others hear (or see) a continous carrier on 472.5 kHz as well ?
> I first thought it was 'local' but since it's only there in the
> nighttime, and even suffers from QSB like the 'wanted' signals it must
> be from a distant transmitter. Don't think it's an intermod product in
> the receiver, because the signal is audible with an SDR-IQ and a Perseus
> as well - not just with the old IC706 which I use at DF0WD for reception
> on MF.
>
> If this frequency is audible / visible in other parts of Europe as well,
> we may have to move the de-facto CW 'calling frequency' a bit... maybe
> by 50 Hz or so which makes it easy to tell an answering call from this
> carrier signal (which sometimes sounds like Morse but in a spectrogram
> one can see that it never disappears 'completely').
>
> 73,
> Wolf DL4YHF / DF0WD
> JO42FD .
>
>