Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb03.r1000.mx.aol.com (Internet Inbound) with ESMTP id EBF38380000AD; Thu, 14 Mar 2013 21:22:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UGJKA-0005xf-35 for rs_out_1@blacksheep.org; Fri, 15 Mar 2013 01:20:46 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UGJK9-0005xW-IA for rsgb_lf_group@blacksheep.org; Fri, 15 Mar 2013 01:20:45 +0000 Received: from mail-ie0-f172.google.com ([209.85.223.172]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1UGJK4-0004Hj-Kf for rsgb_lf_group@blacksheep.org; Fri, 15 Mar 2013 01:20:44 +0000 Received: by mail-ie0-f172.google.com with SMTP id c10so3857931ieb.3 for ; Thu, 14 Mar 2013 18:20:18 -0700 (PDT) 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:in-reply-to:references:date:message-id :subject:from:to:content-type:content-transfer-encoding; bh=pb+ikkPMuZjldDaWM8JsNkDRmxi+eZIeshJvRm/jYgQ=; b=RT6TdS1daBQdpHl3f/NMs1+WLDFwQrXKxZQyD875vlnuZyk/tei4VhS2FD5TuAcJAS kT/6CBg2snRXbE9NU7Yt5KBtKiBM5zi+zO0S/Nf7NnfnGklTVwIAhlizHnwP/okzGuL1 77FeFX7eWEqCEkBwmEs372mt99UKJqKnk4MCzRQcmmg1vN62FhwRysgc8shivGzimGgf d42KeccUSJBLvMGl98JRTuZ0ovW3yytJiYcrBeR9A06wO6UuAcCYfXCddRcgQyl55ZBn GEUgb1cbzKzR1pPtrZbA1QqL0Jzld+2qlxHKDltjjXX4bSVi3+6vJ0OTmFwndSoZNogC Zxfg== MIME-Version: 1.0 X-Received: by 10.50.87.201 with SMTP id ba9mr50355igb.83.1363310418098; Thu, 14 Mar 2013 18:20:18 -0700 (PDT) Received: by 10.50.89.231 with HTTP; Thu, 14 Mar 2013 18:20:18 -0700 (PDT) In-Reply-To: <513B43E5.80600@iup.uni-heidelberg.de> References: <513B43E5.80600@iup.uni-heidelberg.de> Date: Fri, 15 Mar 2013 12:20:18 +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: Hi Stefan, Opperman is great, they will sell to VK and I can pay via Paypal. Thanks for making me aware of this shop and the filter. So, are you using this filter in a DC receiver front end? I want to make a simple DC receiver because I want to set up a RX station at the top of the heavy ion accelerator building, at work. That will put the RX antenna at the top of a 50 metre tower, which may produce interesting results. I can also use a simple low power DC receiver at my block. It's amazing how low the QRM is over there, but of course, I don't have mains power. [...] 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 [209.85.223.172 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: 5f132ffce194fb93f2267a462d849f2b Subject: Re: LF: simple 475 kHz BPF Content-Type: text/plain; charset=ISO-8859-1 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-AUTHENTICATION: mtain-mb03.r1000.mx.aol.com ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d6017514277cb22bb X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Stefan, Opperman is great, they will sell to VK and I can pay via Paypal. Thanks for making me aware of this shop and the filter. So, are you using this filter in a DC receiver front end? I want to make a simple DC receiver because I want to set up a RX station at the top of the heavy ion accelerator building, at work. That will put the RX antenna at the top of a 50 metre tower, which may produce interesting results. I can also use a simple low power DC receiver at my block. It's amazing how low the QRM is over there, but of course, I don't have mains power. 73, Dimitris 2013/3/10 Stefan Sch=E4fer : > Hi Dimitris, > > Here i'm also using a AMradiuo IF filter, a mechanical one. There are > available in a German surplus store, > http://www.oppermann-electronic.de/html/body_hf-spezialbauteile.html FZ-= 02. > Now they cost 6 Euro, i remember they started with 5 EUR ;-) Anyway cheap= i > find because they work really excellent and the effort isn't high to get > good results. > I've got this filter curve in a recent measurement: > https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.pn= g > and > https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%201%20dB.png > Datasheet: https://dl.dropbox.com/u/19882028/MF/FZ_01_FZ_02.pdf > > 73, Stefan/DK7FC > > Am 09.03.2013 04:52, schrieb Dimitrios Tsifakis: > >> Hello group, >> >> I apologise if I am stating the obvious, but perhaps this will be of >> interest to someone. Old AM radio IF transformers connected back to >> back via a tiny capacitor make a simple but effective 475 kHz BPF: >> >> http://people.physics.anu.edu.au/~dxt103/472/rx_bpf/ >> >> 73, Dimitris VK1SV >> > >