Message-ID: <1286354138.4cac34da55fcb@imp.netikka.net>
Date: Wed, 06 Oct 2010 11:35:38 +0300
From: Paul-Henrik <phl@netikka.fi>
To: rsgb_lf_group@blacksheep.org
References: <20101005214122.35319e66@opc1> <C0549ACA2E0745D88C59422BC399F795@Inspiron> <20101006074015.0c0b34ab@opc1>
In-Reply-To: <20101006074015.0c0b34ab@opc1>
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Subject: Re: LF: QRM 498-502 kHz
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Hello John, Lee & co.

The wideband noise was audible again last night in Vaasa, Finland for 20=
 to 30
minutes. I checked the time once and it was past 01.00 local time, so past
2200UTC. There was clearly QSB on the "signal" and it was moderate in stre=
ngth
while audble. I apologize for the somewhat inaccurate times but I only fol=
lowed
this while doing other things meanwhile.

>From various comments on this signal here and on other lists I get the
impression it is received continuously after dark in northwestern central
Europe including G and EI.

Does this suggest the above mentioned areas are within the first "hop" (<2=
000km)
of the signal source but my location requires the signal to travel at leas=
t two
hops since "regular" nighttime propagation alone is not enough to bring th=
e
signal over here? I know there has been speculations regarding this with=
 very
valid arguments already, just wanted to add my findings to the "list of
evidence".

BR

Paul-Henrik, OH1LSQ


Quoting John P-G <gm4slv@sighthound.demon.co.uk>:

> On Tue, 5 Oct 2010 23:38:51 +0100
> "Lee Hudson" <hudsonville@btinternet.com> wrote:
>
> > Hi John, Roelof, Graham, and all,
> >
> > Set up the grabber here so you can see the signal I refer.
>
> Thanks Lee.
>
> I could only watch the LF edge on my own grabber. I'll look at the HF
> edge tonight perhaps.
>
> It appears that there's a wideish carrier at the LF side of the
> noise-like modulated signal at approx 497.830kHz and a very clean
> carrier inside the noise envelope at 498.500. There's no energy within
> a few Hz of this 2nd carrier, which might suggest it is part of the
> overall signal in some way?
>
> I see that these carriers fade up and down at the same times as the
> wideband noise-like signal, which also suggests they are all part of
> the same transmission?
>
> The signal wasn't too strong with me, and it's certainly not hindered
> my reception in the 501.1 WSPR slot - I've received WD2XSH/17 quite
> well over the last few days, and also /37 a couple of times too.
>
> If the mystery signal is strong enough tonight I'll try to DF it with
> my Wellbrook loop, but can't promise anything.
>
> Cheers,
> John
> GM4SLV
> >
>
>
>