Message-ID: <001601c31001$6ff450c0$bee5fc3e@l8p8y6>
From: "hamilton mal" <g3kev.ham@virgin.net>
To: rsgb_lf_group@blacksheep.org
References: <000c01c30f29$700bc080$bbe4fc3e@l8p8y6> <003201c30f4f$ee182a60$6507a8c0@Main>
Date: Thu, 1 May 2003 17:47:15 +0100
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Subject: LF: Re: Re: strange condx
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----- Original Message -----
From: "Alan Melia" <Alan.Melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, April 30, 2003 8:36 PM
Subject: LF: Re: strange condx


> Hi Mal, thanks for the interesting report. I have looked at the darkness
> shadow at that time using Geoclock, and it crosses the path at quite an
> angle, approximately between Berlin and Helsinki. That means the
ionosphere
> is probably still illuminated at around the Russian boarder.  My guess is
> that the early signal was a one hop path from the bottom of the E-layer at
> about 100kms altitude. Later higher order paths become possible as your
end
> of the path goes into darkness and these destructively interfere giving
very
> deep sharp fades. It is surprising under present conditions that the
initial
> signal was so strong as it is a "long hop". Two hop signals would normally
> be stronger and more stable over that distance except that there is a lot
of
> nightime absorption due to the after-effects of the geomagnetic activity.
> This would weaken the two hop signals. Maybe that makes them of similar
> strength to the one hop and hence the deep fade (cancellation when the
> phases oppose)
>
> Of course I could just be totally wrong....but it sounds like a good
story.

Tnx Alan for your observations, the only other explanation could be that
RN6BN lost a couple of FETS and suddenly took a dive because of power
deprivation.
>
> Cheers de Alan G3NYK
> alan.melia@btinternet.com
>
> ----- Original Message -----
> From: "hamilton mal" <g3kev.ham@virgin.net>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: 30 April 2003 16:01
> Subject: LF: strange condx
>
>
> Yesterday early evening around 1900 z RN6BN was a very strong signal,
> stronger than usual about S6 then about one hour later he suddenly started
> to disappear, this is when I worked him on 137.7 QRS3, we have worked
> before. Although weaker he was solid O copy and he gave me the same
report.
> Shortly after we worked he disappeared totally on a CQ then re appeared,
> perfectly readable but during the evening never got as strong as around
> 1900z. I have not noticed this rapid QSB on signals before on 136 khz
There
> seemed to be some unusual propogation at this time.
> YU7AR and OK1DTN were very strong with some variations on their signals
also
> during the evening.
> I also observed some DL acty and DK8KM on hellscriber or some variation of
> the mode, solid signal.
> 73 de Mal/G3KEV
>
>
>
>