Return-Path: Received: (qmail 7788 invoked from network); 30 Apr 2002 13:51:39 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by exhibition.plus.net with SMTP; 30 Apr 2002 13:51:39 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 16557 invoked from network); 30 Apr 2002 13:50:52 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 30 Apr 2002 13:50:52 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 172ZTF-00036F-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 30 Apr 2002 16:23:13 +0100 Received: from mailgate5.cinetic.de ([217.72.192.165]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 172ZTD-000367-00 for rsgb_lf_group@blacksheep.org; Tue, 30 Apr 2002 16:23:12 +0100 Received: from web.de (fmomail02.dlan.cinetic.de [172.20.1.46]) by mailgate5.cinetic.de (8.11.2/8.11.2/SuSE Linux 8.11.0-0.4) with SMTP id g3UDiZX25238 for rsgb_lf_group@blacksheep.org; Tue, 30 Apr 2002 15:44:35 +0200 Date: Tue, 30 Apr 2002 15:44:35 +0200 Message-ID: <200204301344.g3UDiZX25238@mailgate5.cinetic.de> MIME-Version: 1.0 Organization: http://freemail.web.de/ From: "Hans-Albrecht Haffa" To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Mains QRM blanker by PA0LQ Content-Type: multipart/mixed; boundary="------------010405010406030006070608" Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: This is a multi-part message in MIME format. --------------010405010406030006070608 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit rsgb_lf_group@blacksheep.org schrieb am 30.04.02 -----Ursprüngliche Nachricht wurde als Attachment angehängt.-----
Von:rsgb_lf_group@blacksheep.org
Gesendet:30.04.02
An:"Hans-Albrecht Haffa" <haffaHA@web.de>
Betreff:Re: LF: Mains QRM blanker by PA0LQ
To All from PA0SE

Harry, PA0LQ, active on LF until his landlord forbade his aerial, livesin a 12 story apartment block of which corridors are permanently lit byfluorescent tubes. These caused such interference that only very strongsignals could be copied. Harry then constructed a blanker that operateson the audio out of the receiver. The blanker can be synchronised to themains frequency and produces blanking pulses of 50 or 100 Hz. Both widthand position of the pulses can be adjusted for optimum blanking. Thisbrought a great improvement in reception.
Harry combined the blanker  with an active 30 Hz bandwidthnon-ringing audio filter.

I described both items in our VERON magazine Electron of June2000.

If there is interest I am willing to translate the text into English andsend text and circuit diagram by e-mail to anyone requesting it. Orperhaps it could be placed on a website.
But before taking action I await responses.

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