Return-Path: Received: (qmail 16030 invoked from network); 14 Mar 2005 20:19:24 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore03.plus.net with SMTP; 14 Mar 2005 20:19:24 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DAw60-000Ibv-PO for dave@picks.force9.co.uk; Mon, 14 Mar 2005 20:23:26 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DAw60-000Ibk-CR for dave@picks.force9.co.uk; Mon, 14 Mar 2005 20:23:24 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1DAw26-000KVZ-8G for dave@picks.force9.co.uk; Mon, 14 Mar 2005 20:19:22 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DAw1k-0003N8-Tp for rs_out_1@blacksheep.org; Mon, 14 Mar 2005 20:19:00 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DAw1k-0003Mz-Hu for rsgb_lf_group@blacksheep.org; Mon, 14 Mar 2005 20:19:00 +0000 Received: from anchor-post-30.mail.demon.net ([194.217.242.88]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DAw1j-0006LD-6u for rsgb_lf_group@blacksheep.org; Mon, 14 Mar 2005 20:19:00 +0000 Received: from holywell.demon.co.uk ([80.177.210.169]) by anchor-post-30.mail.demon.net with esmtp (Exim 4.42) id 1DAw1i-000Osp-1g for rsgb_lf_group@blacksheep.org; Mon, 14 Mar 2005 20:18:58 +0000 Message-ID: Date: Mon, 14 Mar 2005 20:17:02 +0000 To: rsgb_lf_group@blacksheep.org From: Les Thompson References: In-Reply-To: MIME-Version: 1.0 User-Agent: Turnpike/6.04-S (<7DdtTaHaeC00InRwwgEBnBPR9N>) X-SPF-Result: relay.thorcom.net: 194.217.242.88 is neither permitted nor denied by domain of holywell.demon.co.uk X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: PCR-1000 Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=MAILTO_TO_SPAM_ADDR 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 In article , Dave G3WCB writes >Dear Pat, Les, LF, > >I've been using the Icom PCR-1000 on LF for a few months, and it works >pretty well with my inverted-L antenna. It tunes down to 137 kHz OK so you >don't need a converter, but you do need a pre-amp/preselector to get the >best from the radio and suppress any birdies. I have been using the design >from G3YXM's webpage http://www.wireless.org.uk/circuits2.htm. (The one with >the two Toko coils) > Thanks Dave for that, I should have that same pre-amp in circuit sometime in the next few days and will be interested to see the difference with my small loop. >The tuning is very stable and repeatable, the only slight drawback being >that you can't fit any additional narrow CW filters. This is fine for most >LF modes, ARGO etc, but if you need further filtering for audible CW, say, >you can follow it with an audio filter or use a filter program such as >Spectran. > This is my experience with the PCR1000, I was surprised just how stable it became after allowing it to warm up unlike my IC-725 which has a permanent drift, not very much but too much for LF listening which is a pity because I have better filtering in it. I also use a Datong FL3 for audio filtering as and when necessary. >Set the radio to 135.500 kHz USB to view the entire LF band using Spectran. > I do this but found I needed to damp the Q of the loop to see the full bandwidth, the next loop to be built hopefully will improve on this. -- Les G8ARF / G3VYZ / RSARS 173