Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u3JAZqfR005632 for ; Tue, 19 Apr 2016 12:35:52 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1asSqn-0004zq-5g for rs_out_1@blacksheep.org; Tue, 19 Apr 2016 11:25:45 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1asSqm-0004zh-GG for rsgb_lf_group@blacksheep.org; Tue, 19 Apr 2016 11:25:44 +0100 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1asSqk-0004Dw-Td for rsgb_lf_group@blacksheep.org; Tue, 19 Apr 2016 11:25:43 +0100 X-IronPort-AV: E=Sophos;i="5.24,506,1454976000"; d="scan'208";a="101362590" Received: from unknown (HELO [127.0.0.1]) ([82.153.97.213]) by smtpout.karoo.kcom.com with ESMTP; 19 Apr 2016 11:25:40 +0100 Message-ID: <5716079B.30004@lineone.net> Date: Tue, 19 Apr 2016 11:25:31 +0100 From: LineOne User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5713E677.6040003@lineone.net> <1071555453.20160418034309@chriswilson.tv> In-Reply-To: <1071555453.20160418034309@chriswilson.tv> X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: Re: LF: Alex (R7NT) reports Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7784 For LF reception there's no great secret. A decent communications receiver tuning down to 30kHz combined with a wire aerial broadly (or sharply) tuned to 136kHz, a correct loading coil should do the same job, this reduces broadcast signals to more acceptable levels. The receiver should have no attenuation below (say) 550khz, most of them have a bandpass filter on the front end, the older ones with a tuned front end were good but not stable enough. If you can get a circuit of the front end and re-draw it in a software program such as Tina it will display the frequency response and allow modifications to be set. I altered one inductor only. Beware of the remaining stations on Long Wave, it may require a notch filter, this is where software helps again. I think many transceivers for Amateur use have very poor, mediocre or just average receiver response at LF so I'm not sure if a preamplifier would help unless it's tuned. A notch filter on the receiver is essential and a good USB filter as well. It's worth buying extra filters according to the receiver as supplied. There is some choice but an internet search may help. Hugh, M0DSZ > Hello Hugh, > > Sunday, April 17, 2016 > > Likewise, many thanks to Alex, it is a generous and useful service, > and I look forward to seeing who heard who. Thanks Alex!! > > BTW Hugh, may I ask what you are using for LF reception please? I > want to get a better RX setup here, it isn't very good compared to what > you are achieving. Thanks. > > > Best regards, > Chris 2E0ILY mailto:chris@chriswilson.tv > > > >> I must thank Alex (R7NT) for his carefully collated, weekly reports, it >> helps to coordinate everyone's LF tests. For some reason I haven't been >> receiving him well or often though there are times when I'm not in Rx >> mode by virtue of being on HF fro a while, especially on Sunday mornings. >> Hugh, M0DSZ > > >