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

[wolf_dl4yhf <dl4yhf@freenet.de>]

Hi Lubos and all,

Thanks for checking - so we can be sure this is not a receiver problem on any side.
Your signal is much stronger than this QRM most of the evening, but in some occasions it's irritating to hear a tone at the QSO partner's frequency - especially when there was QSB and one cannot be sure if the over is really 'over'.

I will check 472.000 and 471.692 kHz too, but at the moment the WX is not good (in fact, it's "lousy") for any activities at the club station. We had temperatures just above 0°C here last weekend, and +17°C with lots of rain now.

Oh btw, Finbar EI0CF seems to be back on MF, listening on 472.x kHz in late evenings. IIRC, he usually transmitted around 501 kHz during our last QSOs so it may be worth listening for a reply around that frequency, and announce this in own CQ calls.

All the best,
   Wolf .

Am 24.09.2012 06:58, schrieb Lubos OK2BVG:

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 .
>
>