Return-Path: Received: (qmail 15431 invoked from network); 25 Jul 2001 11:49:17 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 25 Jul 2001 11:49:17 -0000 Received: (qmail 29792 invoked from network); 25 Jul 2001 11:48:57 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 25 Jul 2001 11:48:57 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15PN2a-0004Re-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 25 Jul 2001 12:41:24 +0100 Received: from anchor-post-31.mail.demon.net ([194.217.242.89]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15PN2Z-0004RZ-00 for rsgb_lf_group@blacksheep.org; Wed, 25 Jul 2001 12:41:23 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from jalowe.demon.co.uk ([158.152.173.18]) by anchor-post-31.mail.demon.net with esmtp (Exim 2.12 #1) id 15PN1t-000MGJ-0V for rsgb_lf_group@blacksheep.org; Wed, 25 Jul 2001 12:40:42 +0100 Message-ID: Date: Wed, 25 Jul 2001 12:39:07 +0100 To: rsgb_lf_group@blacksheep.org From: "J. Alan Lowe" Subject: LF: Local noise on 136kHz References: <3B5E8908.E135D569@alg.demon.co.uk> In-reply-to: <3B5E8908.E135D569@alg.demon.co.uk> MIME-Version: 1.0 X-Mailer: Turnpike Integrated Version 5.01 U Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: In message <3B5E8908.E135D569@alg.demon.co.uk>, Steve Rawlings writes >QRM at G8RW >----------- >Recent letters from G8RW describe continuing QRM problems on 136 >kHz from an NTL cable television interface installed in a >neighbour's house. Bob has gone to great lengths to reduce this >continuous source of S9 QRM. He has set up a new antenna feed >arrangement, and designed a remote tuning system to get the >antenna feedpoint away from the house. But the received noise is >still very strong, such that even G4CNN is only just audible >above the noise. I should imagine that a noise canceller, with phase and noise gain controls would be effective here - "an LF version of the JPS ANC-4" Has anyone built such a device for 136kHz/73kHz? Alan, G3XZX