Return-Path: Received: (qmail 92105 invoked from network); 14 Jan 2004 13:36:09 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 14 Jan 2004 13:36:09 -0000 Received: (qmail 29094 invoked from network); 14 Jan 2004 13:36:09 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 14 Jan 2004 13:36:07 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1AglBn-0007SB-FC for dave@picks.force9.co.uk; Wed, 14 Jan 2004 13:36:07 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AglBd-0003hi-Ti for rs_out@blacksheep.org; Wed, 14 Jan 2004 13:35:57 +0000 Received: from [212.77.101.160] (helo=smtp.wp.pl) by post.thorcom.com with esmtp (Exim 4.14) id 1AglBd-0003hS-D7 for rsgb_lf_group@blacksheep.org; Wed, 14 Jan 2004 13:35:57 +0000 Received: (WP-SMTPD 14007 invoked from network); 14 Jan 2004 14:35:26 +0100 Received: from miglanc.socrates.org.pl (HELO lubon) (sq5bpm@[194.181.189.2]) (envelope-sender ) by smtp.wp.pl (wp-smtpd) with SMTP for ; 14 Jan 2004 14:35:26 +0100 X-Bad-Message-ID: no DNS (lubon) Message-ID: <00b501c3daa2$fed47740$2701a8c0@lubon> From: "Marek SQ5BPM" To: rsgb_lf_group@blacksheep.org References: <1AgPdH-1ZJ71l0@fwd11.sul.t-online.com> <004701c3da25$425ad500$2102000a@ibm> Date: Wed, 14 Jan 2004 14:33:26 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Antivirus: skaner antywirusowy poczty Wirtualnej Polski S. A. X-WP-ChangeAV: 0 X-WP-AntySpam-Rezultat: NIE-SPAM Subject: LF: Re: new here..little introduction Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 2 > Sofar I haven't seen any reports of interference caused by 136kHz > stations to consumers electronic devices. > Wonder how serious is the possibility of interfering in audio-equipement > in the neighbourhood?? Hi all, The only interference we found in our club was with our remote HF antenna switching equipment: LEDs connected to long, ca. 40m long cables going to remote relays glow during the transmission. These are probably not fully decoupled from RF, but this is not at all annoying, even better, this gives a visual sign of the transmitted signal HI. Additionally there is one rotor controller's "mouse" which is easy to get interferred by LF as well as HF. It has it's cable unshielded and connected straight to the uP inside the controller, so this is normal. Apart of that there is no known interference in our club and it's surrounding caused by LF at all. Which unfortunately cannot be said about higher frequencies, which easily get into audio & TV equipment ca. 100-150m around the club... 25W of average power ATV on 70cm makes visual "ghosts" on other TV signals. 50W on 50MHz or 144MHz usually causes a total "blackout" in our closest neighbours' TVs, don't ask what happens if we transmit using a little more power. HF causes interference only above ca. 250W, most problematic being the highest HF bands. However 400W of input power on 136kHz makes zero interference. === I will try to be active on LF this weekend at last, starting on Friday. It takes me more than an hour to prepare the TX and antenna plus QRSS QSOs are time-consuming so I must be certain I have at least a few hours of spare time, if I want to get active... 73! Marek SQ5BPM SP5ZCC Scouts Radio Club