Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 60A6A380000AC; Wed, 2 May 2012 18:46:35 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SPiIj-0003Eu-AN for rs_out_1@blacksheep.org; Wed, 02 May 2012 23:45:37 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SPiIi-0003El-Rm for rsgb_lf_group@blacksheep.org; Wed, 02 May 2012 23:45:36 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1SPiIg-0005T5-5l for rsgb_lf_group@blacksheep.org; Wed, 02 May 2012 23:45:35 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id q42MjX98008873 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 3 May 2012 00:45:33 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q42MjX1V005406 for ; Thu, 3 May 2012 00:45:33 +0200 Message-ID: <4FA1B8D4.8010108@iup.uni-heidelberg.de> Date: Thu, 03 May 2012 00:44:36 +0200 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4FA04D47.6070701@iup.uni-heidelberg.de> <4FA13AAF.1070806@toya.net.pl> In-Reply-To: <4FA13AAF.1070806@toya.net.pl> X-MIME-Autoconverted: from 8bit to quoted-printable by relay2.uni-heidelberg.de id q42MjX98008873 X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Thanks Alan, Piotr, Mike and Trevor for the valuable informations. I forwarded several mails to the newcomer :-) 73, Stefan/DK7FC Am 02.05.2012 15:46, schrieb Piotr Mlynarski: > W dniu 2012-05-01 22:53, Stefan Schäfer pisze: >> LF! >> >> Has someone a very good link to basic understanding about LF? I mean >> the LF amateur radio stuff, all which one has to learn when starting >> rx-wise in our hobby! Maybe some ideas and examples, a good >> compliation. Not to complex and focusing on 137 kHz amateur radio? >> For newcomers in the "LF-transmit-world" i recommend ON7YD's page >> http://www.strobbe.org/on7yd/136ant/ >> Is there maybe something for receive newcomers? >> >> A collection of some links may help as well... >> >> Thanks in advance. >> >> 73, Stefan/DK7FC >> >> > Hi Stefan, LF > In my opinion the basic info for ' LF receive newcomers' should be > divided into 3 topics. > While the first one shoud provide knowledge about propagation of long > waves the second one > should provide basic information about modulation techniques used at > LF. The third part might cover > technical ideas/schematics concerning receiving antennae ( either > active or passive), filters, pre/ampifiers > impedance matching issues etc... - here you are an expert... :) > > Concerning the modulation techniques i would still recommend the > excellent Rik, ON7YD website but with different page: > http://www.qsl.net/on7yd/136narro.htm#QRSS > IMO, this is the best starting info i have ever found... > > According to LF propagation effects - i would definitely ask Alan > Melia for the info upon this issue > For those who like to do little math ( just for fun or for more > serious purposes) i would advice to look at the following paper: > http://www.qsl.net/dk2fi/lw/lfprop1.pdf > > those above are just first thoughts etc.... > Yours, Piotr, sq7mpj > > qth:/Lodz/ > [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 49f0f587e44d6711c57b8a4e950ba850 Subject: Re: LF: Basic LF understanding Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:465648608:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d604b4fa1b94a6a20 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Thanks Alan, Piotr, Mike and Trevor for the valuable informations. I=20 forwarded several mails to the newcomer :-) 73, Stefan/DK7FC Am 02.05.2012 15:46, schrieb Piotr Mlynarski: > W dniu 2012-05-01 22:53, Stefan Sch=E4fer pisze: >> LF! >> >> Has someone a very good link to basic understanding about LF? I mean=20 >> the LF amateur radio stuff, all which one has to learn when starting=20 >> rx-wise in our hobby! Maybe some ideas and examples, a good=20 >> compliation. Not to complex and focusing on 137 kHz amateur radio? >> For newcomers in the "LF-transmit-world" i recommend ON7YD's page=20 >> http://www.strobbe.org/on7yd/136ant/ >> Is there maybe something for receive newcomers? >> >> A collection of some links may help as well... >> >> Thanks in advance. >> >> 73, Stefan/DK7FC >> >> > Hi Stefan, LF > In my opinion the basic info for ' LF receive newcomers' should be=20 > divided into 3 topics. > While the first one shoud provide knowledge about propagation of long=20 > waves the second one > should provide basic information about modulation techniques used at=20 > LF. The third part might cover > technical ideas/schematics concerning receiving antennae ( either=20 > active or passive), filters, pre/ampifiers > impedance matching issues etc... - here you are an expert... :) > > Concerning the modulation techniques i would still recommend the=20 > excellent Rik, ON7YD website but with different page: > http://www.qsl.net/on7yd/136narro.htm#QRSS > IMO, this is the best starting info i have ever found... > > According to LF propagation effects - i would definitely ask Alan=20 > Melia for the info upon this issue > For those who like to do little math ( just for fun or for more=20 > serious purposes) i would advice to look at the following paper: > http://www.qsl.net/dk2fi/lw/lfprop1.pdf > > those above are just first thoughts etc.... =20 > Yours, Piotr, sq7mpj > > qth:/Lodz/ >