Message-ID: <4A72D3DF8EDA40E5B32CD35AEF760882@PCFausto>
From: "Fausto Coletti" <faustocoletti@alice.it>
To: <rsgb_lf_group@blacksheep.org>
References: <1E6E217DE1914FEEB537C3126F277ADE@PCFausto> <27E892F4-A535-4FA0-9040-14ED2443BB40@numeo.fr> <BBA44CFA8CDE4B9192BA636CB21983CF@PCFausto> <005401cbac39$c5569410$4001a8c0@lark>
In-Reply-To: <005401cbac39$c5569410$4001a8c0@lark>
Date: Thu, 6 Jan 2011 12:15:17 +0100
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Subject: Re: LF: Luxembourg effect
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Thank you Alan for information,
the phenomenon is present every days after sunset and disappears
at sunrise.
Unfortunately is present exactly into the ham band but the strength
is not so great and i can still receive ham signals.

Fausto IK4NMF

----- Original Message ----- 
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, January 04, 2011 7:02 PM
Subject: Re: LF: Luxembourg effect


> Fausto, the effect referred to by the professionals as ICM Ionospheric
> Cross-Modulation.....is probably what you hear. The two stations are often
> refered to as the "heater" and the "victim". The "heater" is the station
> activating the ionosphere into a non-linear state. It will be between you
> and the "victim"  and it is probable that you would only receive the 
> victim
> by ionospheric means (it is out of ground wave range) The victim and 
> heater
> will probably lie in an arc of about 30 degrees from your location, with 
> the
> heater between you and the victim. The heater will probably be a station 
> of
> at least 500kW though the effect can be noticed on 100kW Loran stations 
> one
> needs sophisticated reception procesing to extract the Loran pulses from 
> the
> victim. The effect is selom heard in daylight because there is more
> attenuation in the D-layer.
>
> The higher frequencies of the modulation are most noticable giving it an
> "etherial" effect
>
> I do have some papers buried in my archive on the effect, and I discussed 
> it
> at length with Vaino OH2LX in the early days of 136kHz.
>
> Alan G3NYK
>
> ----- Original Message ----- 
> From: "Fausto Coletti" <faustocoletti@alice.it>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Tuesday, January 04, 2011 5:05 PM
> Subject: Re: LF: Luxembourg effect
>
>
> I could not send the audio file attachment to the reflector, i think for 
> Kb
> limit,
> the signal is not strong and is audible also with 30 dB attenuator at the
> antenna so,
> is not a receiver overload. I have read some documentation and i think 
> that
> this "ghost signal" is Luxembourg effect.
> Note that i receive it only after sunset.  During daylight the signal
> disappears.
>
> Fausto IK4NMF
>  ----- Original Message ----- 
>  From: John Rabson
>  To: rsgb_lf_group@blacksheep.org
>  Sent: Tuesday, January 04, 2011 10:34 AM
>  Subject: Re: LF: Luxembourg effect
>
>
>  Fausto,
>
>
>  I believe the Luxembourg effect is a form of cross-modulation occurring 
> in
> the ionosphere when there is a high power transmitting station somewhere 
> on
> the path between the receiving and transmitting stations, but the signal
> from the interfering station is not strong enough to overload the 
> receiver.
>
>
>  Could one of our propagation experts provide a more detailed explanation
> please?
>
>
>  73
>  John F5VLF
>
>
>  On 3 Jan 2011, at 15:59CET, Fausto Coletti wrote:
>
>
>    Is this a Luxembourg effect ?
>    First 40 sec i listen at 137 KHz, after i tune at 153 KHz on the
> original transmission.
>    RX is a Perseus SDR with a 200 KHz low pass filter at the input for
> eliminate MF overload.
>    The word "trial" every tot second is because i have install a trial
> version of VAC software.
>
>    Fausto IK4NMF
>
>
>
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