Return-Path: Received: (qmail 9740 invoked from network); 10 Mar 1999 17:19:14 -0000 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by medusa.plus.net.uk with SMTP; 10 Mar 1999 17:19:14 -0000 Received: (qmail 18184 invoked from network); 10 Mar 1999 17:21:37 -0000 Received: from post.thorcom.com (194.75.130.70) by magnet.plus.net.uk with SMTP; 10 Mar 1999 17:21:37 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10KmfJ-0006Ls-00; Wed, 10 Mar 1999 17:21:05 +0000 Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id RAA26387 for rsgb_lf_group-outgoing; Wed, 10 Mar 1999 17:17:17 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id QAA26291 for ; Wed, 10 Mar 1999 16:58:49 GMT Received: from smtp.mail.big-orange.net ([143.179.236.31] helo=Iguanodon.big-orange.net) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10KmMs-0004GS-00 for rsgb_lf_group@blacksheep.org; Wed, 10 Mar 1999 17:02:02 +0000 Received: from onbekend ([143.179.150.228]) by Iguanodon.big-orange.net (Netscape Messaging Server 3.6) with SMTP id AAA5AFD for ; Wed, 10 Mar 1999 14:19:14 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: Priority: Normal X-MSMail-Priority: Normal X-Priority: 3 To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 From: "Dick Rollema, PA0SE" Subject: LF: Re LF-activity in The Netherlands Date: Wed, 10 Mar 99 13:50:21 PST Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org >From Dick, PA0SE The band 135.7 - 137.8 kHz was made available to Dutch amateurs in June 1998. Maximum allowed transmitter output is 400 W; only CW (A1A). My station is located at Leiderdorp, a town adjacent to the university town of Leyden. The QTH is 40 km SW of Amsterdam and 12 km from the North Sea coast. Transmitter output is about 100 W, of which 45 milliwatt is radiated, as determined by measuring the field strength at 1 km distance from the station. I have worked DJ5DI, DK9DX, DJ5BV, DF0WD, G3LDO, G3GRO, G3YXM, G3KAU, G3WSC, GB4RS, G4XTZ, G4GVC, G4HYM, G3KEV, G4WMZ, G3XDV, G3OLB, GW4ALG, GM3YXM/P, ON4ZK, ON7YD, ON6ND, PA0LQ, PA0CWF, PA0MLC, PA0SSB, PA0DSW, PA0CC, PA2NJN. My urban location is a bit noisy, mainly local QRM and a bit of LORAN. But I just finished contruction of a 4-pole audio filter, centre frequency 1000 Hz and with only 35 Hz bandwidth. It is a phase linear design which means that it does not ring. Maximum CW speed that can be passed seems to be about 24 wpm; more than the operator can handle! The filter was designed by Harry Grimbergen, PA0LQ, using a combination of info from "Reference Data for Radio Engineers" and computer simulation. I hope the filer will help in copying weak signals in teh noise. The same result, or maybe an even better one, could have been achieved by an external DSP unit between receiver and headphones or software in the computer. But these solutions must be bought and I like to make it myself. I am available for skeds (hand-keyed morse only) almost any day and time. Evening hours are to be avoided because man made noise is then unreasonably strong. 73 from Dick D.W. Rollema, PA0SE V.d. Marckstraat 5 2352 RA Leiderdorp The Netherlands Tel. +31 71 589 27 34 E-mail: d.w.rollema@gironet.nl (I applied for pa0se@amsat.org but AMSAT advises that implementation may take some time.)