Return-Path: Received: (qmail 27897 invoked from network); 3 May 2000 11:41:46 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by teachers.core.plus.net.uk with SMTP; 3 May 2000 11:41:46 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12mxOe-0007CQ-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 May 2000 12:32:52 +0100 Content-Transfer-Encoding: 8bit Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12mxOd-0007CL-00 for rsgb_lf_group@blacksheep.org; Wed, 03 May 2000 12:32:51 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail.cc.kuleuven.ac.be (8.9.3/8.9.0) with SMTP id NAA441102 for ; Wed, 3 May 2000 13:32:33 +0200 Message-ID: <3.0.1.16.20000503132834.2d4fcc54@mail.cc.kuleuven.ac.be> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Wed, 03 May 2000 13:28:34 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: beacon power control (was Re: LF: IK1ODO beacon signal) In-reply-to: References: <3.0.1.16.20000503100301.2e77a8b0@mail.cc.kuleuven.ac.be> <4.1.20000502224757.020c4040@mailer.inrete.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: At 11:17 3/05/00 +1, IZ1ANT wrote: >On the contrary a very accurate PA proctection would be required if >a POSITIVE feedback to the antenna current meter has to be connected >to an unattended TX. The feedback from the amp-meter to the TX is NEGATIVE (if the antennacurrent increases the TX output power is forced to decrease). In combination with a reflected power protection (as used by G3YXM in this TX design) the TX will withstand any mistreatement including short- and open-circuit. As the beacon is meant to be low-power (10mW and less) a relative small TX power can be used (50 Watts and less), so it can easily be overdimensioned to provide extra safety. 73, Rik ON7YD