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Date: Fri, 13 Dec 2002 16:09:04 +0100
Message-ID: <2D280BB697C7EE4C979C5C89925418EF368FD5@TNS-FBU-2E-003.corp.telenor.no>
Thread-Topic: Re: (Off Topic) PC mains filter for 136kHz interference
Thread-Index: AcKitMNDx/qZaB+YReObVp5OOgZC+AABFZFQ
From: jan-martin.noding@telenor.com
To: rsgb_lf_group@blacksheep.org
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Subject: LF: Re: (Off Topic) PC mains filter for 136kHz interference
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Tnx

Also considered setting to spread spectrum for the clock osc, 
but we didn't find how to deal with IBM Aptiva PC, hi
(The two PC's types with most problems seems to be COMPAQ and IBM types, 
but the manufacturers never seem to understand that a reset button could be needed!!!)

73
Jan-Martin

-----Opprinnelig melding-----
Fra: Dave Pick [mailto:g3yxm@wireless.org.uk]
Sendt: 13. desember 2002 15:27
Til: rsgb_lf_group@blacksheep.org
Emne: LF: Re: (Off Topic) PC mains filter for 136kHz interference


Jan-Martin.

Try changing one of the video settings such as frame rate of the monitor if
your video card allows. It is usually video/monitor that produce stable
carriers in the 136 band.
Alternatively just switch to a different resolution.
Prove it by switching the monitor off and leaving the PC on.

Dave G3YXM.


> Have a steady tone around 136.5kHz. It is definitely from my PC,
> and the level was much reduced when the frame aerial was moved out into
the
> garden, but still I must switch off the PC when listening on certain
> parts of the band.
>
> Wonder if somebody has any experience in building mains filters for the PC
?
>
> 73,
> Jan_Martin
> LA8AK (in JO38XC) tel.: +47-380-87178 (52660)
> http://www.laud.no/la6nca/LA8AK/
>
>