Hi Paul-Henrik, You could be right about it being ICM (or "luxembourg effect"
on Lakihegy. If so you should hear or see the "telegrams that Lakihegy sends on
the "splatter as well. If it is ICM (Ionosphereic Cross Modulation) then the BC
"victim" is probably on approximately the same bearing as Lakihegy and not more
than 20 30 degrees off line. It is possible that other in differenct areas may
hear a different BC station
Best Wishes
Alan G3NYK
--- On Mon, 7/12/09, Paul-Henrik <[email protected]> wrote:
> From: Paul-Henrik <[email protected]>
> Subject: LF: Broadcast audio splatter on 136kHz
> To: [email protected]
> Date: Monday, 7 December, 2009, 16:16
> LF
>
> Does anybody else on the reflector suffer from BC-splatter
> on 136kHz? It has
> been a regular occurance here lately after dark. After some
> identification work
> I have a match on the running programmes on 171 and 225kHz,
> 225kHz being the
> stronger.
>
> I blamed my RX chain at first and started to eliminate IMD
> possibilities but
> even now using a passive antenna and a very sharp bandpass
> filter (much like an
> IF-filter for a valve BC-set) I still have the BC
> splatter.
>
> So far I have not been able to determine the carrier
> frequency of this "phantom
> station" but it must be close to the carrier of Lakihegy.
> Using AM detection
> with a narrow filter it seems centered around 135.4kHz.
> Sounds like two
> BC-stations on top of eachother and the USB reaches up in
> the amateur band
> making "ghost whispers".
>
> Luxembourg effect, transmitter IMD or just me missing the
> point? The bandpass
> filter is very effective and there are only weak traces of
> signals above
> 150kHz.
>
>
> BR
>
> Paul-Henrik, OH1LSQ
>
>
>
>
>
>
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