Return-Path: Received: (qmail 15471 invoked from network); 12 Nov 2002 12:13:12 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 12 Nov 2002 12:13:12 -0000 Received: (qmail 15855 invoked from network); 12 Nov 2002 12:12:37 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 12 Nov 2002 12:12:37 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18BZpO-0000ar-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 12 Nov 2002 12:07:34 +0000 Received: from [212.159.14.227] (helo=warrior.services.quay.plus.net) by post.thorcom.com with smtp (Exim 4.10) id 18BZpN-0000ai-00 for rsgb_lf_group@blacksheep.org; Tue, 12 Nov 2002 12:07:33 +0000 Received: (qmail 17817 invoked from network); 12 Nov 2002 12:07:01 -0000 Received: from unknown (HELO hugh) (62.60.118.254) by warrior.services.quay.plus.net with SMTP; 12 Nov 2002 12:07:01 -0000 Message-ID: <001201c28a43$90d64a80$0504210a@c.scope> From: "g6tmk" To: rsgb_lf_group@blacksheep.org References: <2D280BB697C7EE4C979C5C89925418EF368F80@TNS-FBU-2E-003.corp.telenor.no> Date: Tue, 12 Nov 2002 12:03:34 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: RX Frame Aerial for 136kc/s - still experimenting..... Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.5 required=5.0tests=REFERENCES,SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Hello Jan-Martin, How big is your frame antenna ? 73 Hugh M0WYE ----- Original Message ----- From: To: Sent: Tuesday, November 12, 2002 11:16 AM Subject: LF: RX Frame Aerial for 136kc/s - still experimenting..... Hi still experimenting with frame antenna for 136kHz. The attached drawing (20kB) shows almost how it would have been made today, somewhat different from the actual antenna. Experienced that it was no need for amplifier for a loop for 80m reception (used to avoid electrical noise from the open power lines), and now also experienced that an amplifier did not improve reception for my 136kHz aerial, the coupling has 1/100 area of the whole frame, seems to work for 50 ohm, the tuning range seems to be somewhat too small, need somewhat increased capacitance in cold weather, but it is low enough for rain. The S/N ratio is almost the same with the coupling loop as for high impedance amplifier connected to the end of capacitance. The aerial has been tested in +10°C....-2°C Signal strength last night for DCF39 was 80-150µV (-75...-80dBU) Not sure if it is still a point to ground the center of the tuned loop. 73 Jan_Martin LA8AK@online.no (WW.Loc: JO38XC) N4623-Kristiansand (tel.: +47-380-87178) http://www.laud.no/la6nca/la8ak/