Return-Path: Received: (qmail 74844 invoked from network); 4 Jan 2005 20:02:57 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 4 Jan 2005 20:02:57 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1ClusI-000ATy-1L for dave@picks.force9.co.uk; Tue, 04 Jan 2005 20:01:50 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1ClusG-000ATb-O0 for dave@picks.force9.co.uk; Tue, 04 Jan 2005 20:01:48 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1ClutI-000Gi1-3M for dave@picks.force9.co.uk; Tue, 04 Jan 2005 20:02:52 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Clusz-0000S0-KO for rs_out_1@blacksheep.org; Tue, 04 Jan 2005 20:02:33 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Clusz-0000Rr-8J for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2005 20:02:33 +0000 Received: from bay102-f11.bay102.hotmail.com ([64.4.61.21] helo=hotmail.com) by relay.thorcom.net with esmtp (Exim 4.41) id 1Clusu-0005uc-Qm for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2005 20:02:33 +0000 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 4 Jan 2005 12:02:22 -0800 Message-ID: Received: from 138.32.32.44 by by102fd.bay102.hotmail.msn.com with HTTP; Tue, 04 Jan 2005 20:01:25 GMT X-Originating-IP: [138.32.32.44] X-Originating-Email: [hellozerohellozero@hotmail.com] X-Sender: hellozerohellozero@hotmail.com In-Reply-To: From: "Laurence KL1X" To: rsgb_lf_group@blacksheep.org Date: Tue, 04 Jan 2005 11:01:25 -0900 Mime-Version: 1.0 X-OriginalArrivalTime: 04 Jan 2005 20:02:22.0489 (UTC) FILETIME=[4DA5F890:01C4F298] X-SPF-Result: relay.thorcom.net: domain of hotmail.com designates 64.4.61.21 as permitted sender X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,MSGID_FROM_MTA_HEADER=0 Subject: RE: LF: TA 04Jan Content-Type: text/plain; charset=windows-1252; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=MSGID_FROM_MTA_HEADER 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit Tom see http://www.g0mrf.freeserve.co.uk/preamp.htm I fitted two of this is a small box and literally connected them in series They are nominal 50 ohm in/out devices and only cover the 137Khz band - sounds like a Q mulitplier as you tune across the band with the pre amp on... Ive not run figures on them in series but the gain is sufficient for the 817 with a bit to spare on a medium sized loop Laurence >From: Dr. Tom Gruis, KØHTF >Reply-To: rsgb_lf_group@blacksheep.org >To: >Subject: RE: LF: TA 04Jan >Date: Tue, 4 Jan 2005 13:53:48 -0600 > >I would very much appreciate information on the modifications! > >Thanx, > >Doc. > >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Laurence KL1X >Sent: Tuesday, January 04, 2005 13:48 >To: rsgb_lf_group@blacksheep.org >Subject: RE: LF: TA 04Jan > > >Ive just modified the outboard preamps for the FT817 and now have to >"seried" 2 x g3yxm/mrf bandpass amps and thats woken the 817 up! More >than >sufficient gain and I may end up putting a T 50 ohm attenuator between the >two small boards to limit it a bit... > >CFH on 137Khz was strong FSK at local lunchtime 18Z here in Oklahoma over >the rain/general static > >Laurence Kl1x/5 em26aq >137,7752/137,7755 dfcw90 1Kw >wet and freezing rain > > > > > > >