Message-ID: <1260346208.4b1f5b607631a@imp.netikka.net>
Date: Wed, 09 Dec 2009 10:10:08 +0200
From: Paul-Henrik <phl@netikka.fi>
To: rsgb_lf_group@blacksheep.org
References: <1260202597.4b1d2a65f3b5c@imp.netikka.net> <006d01ca785c$c99a08c0$3ab27cbc@ap6fnsa53r3k6h>
In-Reply-To: <006d01ca785c$c99a08c0$3ab27cbc@ap6fnsa53r3k6h>
MIME-Version: 1.0
User-Agent: Internet Messaging Program (IMP) 3.2.6
Subject: Re: LF: Re: Broadcast audio splatter on 136kHz
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


LF

Marcin, Jacek , Alan, Victor

Thank you all for your kind input and advice. I'm still investigating the=
 causes
of this problem. I chose to sum up my comments in one reply:


>Paul-Henrik gave two frequencies: 171kHz and 225kHz (i can't see how they
>can give around 135.4kHz via mixing, so there is probably a third station
>involved).

I also couldn't find any logical relationship in these two frequencies. I'=
ve
been hunting "duplicates" of the programmes running on 171 and 225 kHz and=
 for
171 kHz I have found at least two duplicates in the MW-band. One is 135 kH=
z
above the very strong 630 kHz (but 630 kHz audio is not present in the pha=
ntom
signal and this could theoretically be one reason). However, for the stron=
ger
phantom signal similar to the audio on 225kHz I have not found any other
frequencies. Is there a remote possibility for 3 x 225 kHz -/+ 135 kHz to
generate a mixing product with fully intelligeble audio of the 225 kHz sig=
nal
on 135 kHz?


>Hi Paul-Henrik, You could be right about it being ICM (or "luxembourg eff=
ect"
>on Lakihegy. If so you should hear or see the "telegrams that Lakihegy se=
nds
>on the "splatter as well. If it is ICM (Ionosphereic Cross Modulation) th=
en
>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 differ=
enct
>areas may hear a different BC station

I don't recognize the Lakihegy telegrams riding on the "splatter". Perhaps=
 my
usage of the term splatter is incorrect here, after all it is the high
frequencies of the USB signal I'm hearing. Lakihegy and 225kHz do line up=
 quite
well as seen from here.


> I forwarded my friends engineers from Solec Kujawski about your problem.

This is very kind of you. However I hope they understand there are no hard=
 facts
at this moment pointing to a fault at their end.


>same situation here,also on a passive T ant and tunable bandfilter with
>different receivers,not very strong..

Victor, do you specifically hear the same BC-source(s) as I do?



BR

Paul-Henrik, OH1LSQ