Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w2GBwrtI010175 for ; Fri, 16 Mar 2018 12:58:54 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ewnw5-0008Gu-Op for rs_out_1@blacksheep.org; Fri, 16 Mar 2018 11:54:13 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ewnw5-0008Gl-92 for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 11:54:13 +0000 Received: from mail-wm0-x234.google.com ([2a00:1450:400c:c09::234]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1ewnw2-0005OL-Gq for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 11:54:12 +0000 Received: by mail-wm0-x234.google.com with SMTP id z9so2516661wmb.3 for ; Fri, 16 Mar 2018 04:54:10 -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=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=pgyh8LzxNlQI6yt+b5y6qOFKn2z9gjnQQE2nN5aQ2uA=; b=NqQA9MknMahk71wQlzbc3i/Jwx677L3EeoP0t25DI285Py/r670czyAElPP97DHUUo rnXWCW+rKpwbNGuN8uU51XyGymHtXMI8Etktn1QJ7lRcTckCyWdD8va89PNUUUxryAIm SISvsAAoe1C8zhqELCEp6aAHRq+BkFWdcmwZVUoq8jGJsIgHP5+D+U6pBgrTSjw0zCne 5gKAoTcaCqzlqeyMiDT4x0brrv/QRq0PLH2/mUVTsJIyWFWKV1u/H+e8OcII+u5ChcTb w0gUHmeyZgdnbSKzCTKsXV/wyg6mUj4E5oPwn6z3yPrTSZex3b7qfW8JpBTdaLJOYs4B QSXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=pgyh8LzxNlQI6yt+b5y6qOFKn2z9gjnQQE2nN5aQ2uA=; b=bZNYLNof7aMOj59EymMkbgEmRMkXZTUh/XrMDl+F2DhrTuy8c1SGA26SZ8kOKbYKis juV2/bkgQyzmR37i4CrTJPE3OdUD/P40CNvjZKlYBCceOvolEbSMewW2BCbebggVGYoD QmQrhMN82AK5xTwGmNA4M85ZLAqE9e5yAB5r+AS4YmB5GDtv85r2vNs4uuHqyc9RuhA8 9I/8eKgNzgK7gH6ho0UlvUNv8DNaxyNYQ86cOfPnXojmbw1h6DM1GEcIfwCjNo5pCFLd MVsdZREoafw++4JccJmjjaDNOkAw/cStFpSaSiFJZcdlVjIdPq2wpGWguEIycF/7obSI v8ZQ== X-Gm-Message-State: AElRT7HibJR3r91ZMXhOUBGo+rFbe9CAYbXE61+dNA4glwpproEhQB0T Q/WXnZVD+OrJ32RZrvoQJrvP8cv591IF6LhvBpBTAw== X-Google-Smtp-Source: AG47ELv4zpAMdNffe6yXnSgb1I06DIT5rvl6IUFxT5fXq+LsXpAk0qd+COb2rBksmSYGdLUSBdSvqKdUgRtisX6+beA= X-Received: by 10.80.212.219 with SMTP id e27mr2191263edj.205.1521201249437; Fri, 16 Mar 2018 04:54:09 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.179.204 with HTTP; Fri, 16 Mar 2018 04:54:09 -0700 (PDT) In-Reply-To: <772364530.20180316113613@gmail.com> References: <772364530.20180316113613@gmail.com> From: Andy Talbot Date: Fri, 16 Mar 2018 11:54:09 +0000 Message-ID: To: LineOne Cc: Chris Wilson X-Spam-Score: 1.0 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: After, definitely Before is applicable to VHF and up where equipment noise figure dominates sensitivity and a filter in the antenna side wold add loss and degrade overall NF At HF and certainly LF, atmos noise dominates to noise figure is unimportant. That way you get the benefit of rejecting strong OOB signals that may stress even the preamplifier [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.0 FREEMAIL_REPLY From and body contain different freemails X-Scan-Signature: c6a8ca7629fac3d35507e5a7fd3cbf17 Subject: Re: LF: Pre amp *after* BPF?? Content-Type: multipart/alternative; boundary="94eb2c1af5201acd2105678644e6" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE 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 --94eb2c1af5201acd2105678644e6 Content-Type: text/plain; charset="UTF-8" After, definitely Before is applicable to VHF and up where equipment noise figure dominates sensitivity and a filter in the antenna side wold add loss and degrade overall NF At HF and certainly LF, atmos noise dominates to noise figure is unimportant. That way you get the benefit of rejecting strong OOB signals that may stress even the preamplifier 'jnt On 16 March 2018 at 11:36, Chris Wilson wrote: > > > Hello LF'ers, > > Been Googling and see a mixed response to should a receive pre-amp go > before or after a BPF. I have mine before the pre-amp, does the panel > concur with this being correct? Thanks! > > Aerial, isolation transformer for ground loops, BPF, pre-amp, Red > Pitaya as the LF receiver. > > -- > Best regards, > Chris mailto:dead.fets@gmail.com > > > --94eb2c1af5201acd2105678644e6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
After, definitely

Before is applicable = to VHF and up where equipment noise figure dominates sensitivity and a filt= er in the antenna side wold add loss and degrade overall NF

<= /div>
At HF and certainly LF, atmos noise dominates to noise figure is = unimportant.=C2=A0 =C2=A0That way you get the benefit of rejecting strong O= OB signals that may stress even the preamplifier

&= #39;jnt


On 16 March 2018 at 11:36, Chris Wilson = <dead.fets@gmai= l.com> wrote:


Hello=C2=A0 LF'ers,

Been=C2=A0 Googling and see a mixed response to should a receive pre-amp go=
before=C2=A0 or after a BPF. I have mine before the pre-amp, does the panel=
concur with this being correct? Thanks!

Aerial,=C2=A0 isolation=C2=A0 transformer=C2=A0 for=C2=A0 ground=C2=A0 loop= s, BPF, pre-amp, Red
Pitaya as the LF receiver.

--
Best regards,
=C2=A0Chris=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 mailto:d= ead.fets@gmail.com



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