Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df05.r1000.mx.aol.com (Internet Inbound) with ESMTP id C4DFD3800008C; Mon, 26 Mar 2012 01:42:28 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SC2g5-0005Tu-Dg for rs_out_1@blacksheep.org; Mon, 26 Mar 2012 06:41:13 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SC2g4-0005Tl-Mx for rsgb_lf_group@blacksheep.org; Mon, 26 Mar 2012 06:41:12 +0100 Received: from cpsmtpb-ews03.kpnxchange.com ([213.75.39.6]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SC2g2-0003od-Ur for rsgb_lf_group@blacksheep.org; Mon, 26 Mar 2012 06:41:12 +0100 Received: from cpsps-ews27.kpnxchange.com ([10.94.84.193]) by cpsmtpb-ews03.kpnxchange.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 26 Mar 2012 07:40:58 +0200 Received: from CPSMTPM-TLF103.kpnxchange.com ([195.121.3.6]) by cpsps-ews27.kpnxchange.com with Microsoft SMTPSVC(7.5.7601.17514); Mon, 26 Mar 2012 07:40:58 +0200 Received: from Extensa ([195.241.183.120]) by CPSMTPM-TLF103.kpnxchange.com with Microsoft SMTPSVC(7.5.7601.17514); Mon, 26 Mar 2012 07:40:58 +0200 Message-ID: From: "PA1SDB, Peter" To: References: <1FFFC71EA0BE4176BEFFBF7D095D3BA9@Extensa> <4106A79FDAE74690B0A2C710BDA51B55@Extensa> In-Reply-To: Date: Mon, 26 Mar 2012 05:40:57 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18416 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18645 X-OriginalArrivalTime: 26 Mar 2012 05:40:58.0507 (UTC) FILETIME=[0550ADB0:01CD0B13] X-RcptDomain: blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz ! Content-Type: text/plain; format=flowed; charset="ISO-8859-15"; reply-type=response Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:392712064:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40d94f7001c41f06 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Roelof, VLF, LF, but also HF, VHF, UHF and SHF :-) Today I will try to ad some stabilyzers, filters, C's and Choces at the powers supply Mini Whip input. That single 9 volt battery block was empty after 12 hours. It did drop from 9.4 to 7.3 in 12 h. A bit expensive to buy 2x 9v batery's a day :-) 73's Peter, PA1SDB http://www.qsl.net/pa1sdb/ ----- Original Message ----- From: "Roelof Bakker" To: Sent: Sunday, March 25, 2012 6:45 PM Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz ! > Hello Peter, > > I found that a BFQ19S gives slight better strong signal handling > performance. > But more important, it works better at a lower supply voltage. > So, for use with a 9V battery, the BFQ19S is recommended. > At 12V you will not notice any difference. > > You could also try to feed the antenna direct from a battery by a separate > two wire DC cable, instead of over the coax cable. > In this case the antenna interface can be omitted. > It is best to place the battery at the foot of the mast. > > There are more options, like using CAT5 cable, isolating transformers etc. > However, it all depends on your specific location. > > 73, > Roelof, pa0rdt >