Return-Path: X-Spam-DCC: paranoid 1356; 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=-0.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE,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 u3EBZLRX019166 for ; Thu, 14 Apr 2016 13:35:21 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aqfSs-0005Z5-SE for rs_out_1@blacksheep.org; Thu, 14 Apr 2016 12:29:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aqfSs-0005Yw-Bl for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2016 12:29:38 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1aqfSq-0002Pm-M2 for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2016 12:29:37 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 7E365209F3 for ; Thu, 14 Apr 2016 13:29:35 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3qlz3M2Y7Qz5vNF for ; Thu, 14 Apr 2016 13:29:35 +0200 (CEST) Message-ID: <570F7F1F.1030003@posteo.de> Date: Thu, 14 Apr 2016 13:29:35 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <579355A36AEE9D4FA555C45D556003AB53B69985@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB53B69985@servigilant.vigilant.local> X-Scan-Signature: 7f2e5481aa97b3cbff3d653a1b2ddfbd Subject: Re: LF: EA in LF NOW ! Content-Type: multipart/alternative; boundary="------------020208080900070303040009" 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: 7709 This is a multi-part message in MIME format. --------------020208080900070303040009 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Am 14.04.2016 12:21, schrieb VIGILANT Luis Fernández: > Now I'm completely sure I bought the right house for a Ham point of > view ! ;-) Hm, can't you buy the other building too, and run a wire at 100m AGL? :-) > Then the next issue (appart of PA) will be a switching system to be > able to alternate Tx periods in MF and LF. Think it will be > doable using small power > and vacuum relays. It's a pity to be forced to choose to Tx in only > one band That's a problem of many of us. But there is not really a good solution if you want to maximise the efficiency of each band. On QRP it may work but i find it's better to put the effort in the improvement of the radiated power ;-) Better to switch manually each few days. Also, during the years here i have not heard about someone who realised such a serious band switch. The problem is, you need to switch at HV and the complete arrangement will have a significant C against ground, which will lower the efficiency of the whole system. But of course, there ARE solutions, like a large mechanical switch as used in HV switch gears... Just my opinion of course. 73, Stefan --------------020208080900070303040009 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Am 14.04.2016 12:21, schrieb VIGILANT Luis Fernández:

Now I'm completely sure I bought the right house for a Ham point of view ! ;-)

Hm, can't you buy the other building too, and run a wire at 100m AGL? :-)

Then the next issue (appart of PA) will be a switching system to be able to alternate Tx periods in MF and LF. Think it will be doable using small power

and vacuum relays. It's a pity to be forced to choose to Tx in only one band

That's a problem of many of us. But there is not really a good solution if you want to maximise the efficiency of each band. On QRP it may work but i find it's better to put the effort in the improvement of the radiated power ;-)
Better to switch manually each few days. Also, during the years here i have not heard about someone who realised such a serious band switch. The problem is, you need to switch at HV and the complete arrangement will have a significant C against ground, which will lower the efficiency of the whole system. But of course, there ARE solutions, like a large mechanical switch as used in HV switch gears...
Just my opinion of course.

73, Stefan --------------020208080900070303040009--