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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 -----
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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03/01/2011
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