Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 264023800028E; Mon, 7 Jan 2013 00:26:21 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ts5CX-0006ZS-0p for rs_out_1@blacksheep.org; Mon, 07 Jan 2013 05:24:45 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ts5CW-0006ZJ-5w for rsgb_lf_group@blacksheep.org; Mon, 07 Jan 2013 05:24:44 +0000 Received: from mail-ia0-f177.google.com ([209.85.210.177]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1Ts5CQ-0003mC-IP for rsgb_lf_group@blacksheep.org; Mon, 07 Jan 2013 05:24:43 +0000 Received: by mail-ia0-f177.google.com with SMTP id u21so15403596ial.8 for ; Sun, 06 Jan 2013 21:24:16 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:date:message-id:subject:from:to :content-type; bh=+U9Cvi8qzcIkRG2aP3hNofO4iRkFAhYB544dvnUO4xc=; b=XgMTncazn1OcudhYuf0snDiL0/HgmpEwN458+YSsziLSZX2vT50dnKiJt+DGCbOCU1 7bui2Zg8PkHBkm3dEgsG/alNZq3wHedscXatw9L3i4wZWEaPjQRBgkeT/pRkKKA8k76D AMBzTEdC1YhWI32EWFTATA91pljEfKPCcuXeII/ZO5cEErQILrI3D5wTDlpQaNKtuelX at6HB+OtHPNxdLJr3SIzryyJluuBiyXYUkywyl5o2A/YIqT6o/2lITtR7KGXQM5/GPU9 7B6LAoS8e1cI60dzi2I43SWOWd5OvudiCbBcAEIzfcALPJjBnUiToKdcX5G2C1m1XQYv LjdQ== MIME-Version: 1.0 X-Received: by 10.50.13.173 with SMTP id i13mr4672523igc.93.1357536256151; Sun, 06 Jan 2013 21:24:16 -0800 (PST) Received: by 10.231.157.74 with HTTP; Sun, 6 Jan 2013 21:24:16 -0800 (PST) Date: Mon, 7 Jan 2013 16:24:16 +1100 Message-ID: From: Dimitrios Tsifakis To: rsgb_lf_group@blacksheep.org X-Spam-Score: -0.7 (/) 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: Hello LF/MF group, I though this may be of interest to those what would like to build the simplest transmitter possible for MF. I found these cheap crystals on eBay: [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.210.177 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dtsifakis[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 4ad5f3f1a9241b934aaa5d0e23c9dc57 Subject: LF: 475kHz crystal Content-Type: text/plain; charset=ISO-8859-1 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-AUTHENTICATION: mtain-dc02.r1000.mx.aol.com ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d408250ea5c7d2b4d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello LF/MF group, I though this may be of interest to those what would like to build the simplest transmitter possible for MF. I found these cheap crystals on eBay: http://www.ebay.com.au/itm/2-PCS-15200-KHz-HC-49-U-X-TAL-Bargain-Pack-HC49U-/320828846717?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4ab2e3b27d They are 15200 kHz which can be conveniently used with a 74HC4060 to make an oscillator, then connect to the divide_by_32 line for a nice, stable 475 kHz signal. You can then drive a class-E FET PA for any kind of power you like. 73, Dimitris VK1SV