Message-ID: <1255365325.4ad35acd6c922@imp.netikka.net>
Date: Mon, 12 Oct 2009 19:35:25 +0300
From: Paul-Henrik <phl@netikka.fi>
To: rsgb_lf_group@blacksheep.org
References: <245132.24289.qm@web28107.mail.ukl.yahoo.com>
In-Reply-To: <245132.24289.qm@web28107.mail.ukl.yahoo.com>
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Subject: LF: ADSL noise Q for petefmt
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Hello Pete, LF

> Well I can only conclude it is ADSL because it is
> just raising the noise floor it is=A0very subtle not really identifiable=
 like
> say TV LTB, it's a mush. Frame ants help a bit but not as sensitive at=
 the LW
> by a mile.

> 73 petefmt

I'm also plagued by a "not really identifiable" mush-like noisefloor. In=
 my case
it is not affecting RX on 500kHz badly, at least I seem to hear you guys=
 pretty
well and daytime the band sounds pretty fine. Here the problems start in=
 the
high end of the MW BC band and extends up to about 2600kHz with a constant
level. Above 2600kHz it slowly drops off and at 3000kHz it is more or less
gone.

The noise has no real characteristic, it is like a constant 24/7/365 white=
 noise
(S7 on IC-718 with inverted-L antenna) and I can not D/F it on any of my=
 loops.

I have even disconnected all incoming mains and phone lines to the house=
 just
above earth level and ran the radio from a battery but it is still there..=
.

I have tried to nail this pest many times but always failed so far. A clue=
 to
what kind of technology that could cause white noise in this spectrum woul=
d be
very helpful in the battle.

Thankful for any hints.


Then a word of warning as this may soon affect many of us:

On top of this the local electric company recently installed smart billing
meters in our area running LonTalk over 4800baud FSK PLC on 66.7kHz. The=
 2'nd
harmonic sidebands of this EU approved complete engineering failure piece=
 of
crap technology are now wiping out 136kHz completely daytime... With night=
time
QRN it just about "blends in" when using a 250Hz CW filter. The signal is=
 all
over in every cm of mains wiring indoors too. At least I know my enemy in=
 this
case but being approved technology used for every household means there is=
 very
little to do but live with it.

73

Paul-Henrik / OH1LSQ