Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da02.r1000.mx.aol.com (Internet Inbound) with ESMTP id DDACA380000AB; Wed, 25 Jul 2012 04:38:39 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Stx5i-0007ZY-E6 for rs_out_1@blacksheep.org; Wed, 25 Jul 2012 09:37:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Stx5h-0007ZP-Sb for rsgb_lf_group@blacksheep.org; Wed, 25 Jul 2012 09:37:09 +0100 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Stx5g-0003dS-7g for rsgb_lf_group@blacksheep.org; Wed, 25 Jul 2012 09:37:08 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhkFAKCqD1BOk8uD/2dsb2JhbABFox4DlkSBCIIbFAEBA0kCLAIIAgEHHTkBBBoGCBwdAQICAQGIAJoBoW6SPwOIGYVBl3yCXw X-IronPort-AV: E=Sophos;i="4.77,652,1336345200"; d="scan'208,217";a="399138829" Received: from host-78-147-203-131.as13285.net (HELO xphd97xgq27nyf) ([78.147.203.131]) by out1.ip01ir2.opaltelecom.net with SMTP; 25 Jul 2012 09:37:07 +0100 Message-ID: <003001cd6a40$a9199650$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Wed, 25 Jul 2012 08:37:00 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 3.1 (+++) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: MF I tried a full size Horizontal dipole up at 12 metres high for 160 metres some years back and it was NO GOOD for DX long haul Transmitting, however it did work well on Receive I was able to receive East coast USA stations at good strength both on CW es SSB but they had difficulty or could not hear me running 400 Watts to the antenna. When I changed over to a 1/4 wave inv L with a vertical height of 20 metres I was able to work every one that i could hear including ZL es VK plus all the W stns as far as W6/7 es VE7 Because the dipole was so low the angle of radiation was too high and the transmitted RF had fizzled out on long haul. Locally it was probably ok but this was not my aim. I have a 25 metre mast available at present and thought about an inv V dipole for 600 metres as an experiment but it would be so low at this frequency and exhibit high angle radiation that it would be useless for long haul but probably very good around EU Apart from the fun of antenna experimentation on LF/MF the only approach is a Vertical system, like an inv L or T to guarantee all round results both on TX es RX but especially Transmitting. [...] Content analysis details: (3.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.24.128.237 listed in list.dnswl.org] 1.0 FSL_XM_419 Old OE version in X-Mailer only seen in 419 spam -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.4 FSL_UA FSL_UA 1.7 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: bf9cd6b3d49c805062abf73a1027fea8 Subject: LF: MF DOPOLE Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01CD6A40.A8965C90" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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: 0:2:387426304:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d404a500fb08f7a60 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_002D_01CD6A40.A8965C90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MF I tried a full size Horizontal dipole up at 12 metres high for 160 = metres some years back and it was NO GOOD for DX long haul Transmitting, however it did work well on Receive=20 I was able to receive East coast USA stations at good strength both on = CW es SSB but they had difficulty or could not hear me running 400 = Watts to the antenna. When I changed over to a 1/4 wave inv L with a vertical height of 20 = metres I was able to work every one that i could hear including ZL es VK = plus all the W stns as far as W6/7 es VE7 Because the dipole was so low the angle of radiation was too high and = the transmitted RF had fizzled out on long haul. Locally it was probably ok but this was not my aim. I have a 25 metre mast available at present and thought about an inv V = dipole for 600 metres as an experiment but it would be so low at this = frequency and exhibit high angle radiation that it would be useless for = long haul but probably very good around EU Apart from the fun of antenna experimentation on LF/MF the only approach = is a Vertical system, like an inv L or T to guarantee all round results = both on TX es RX but especially Transmitting. de mal/g3kev ------=_NextPart_000_002D_01CD6A40.A8965C90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
MF
I tried a full size Horizontal dipole up at 12 = metres high=20 for 160 metres some years back and it was NO GOOD for DX long = haul
Transmitting, however it did work well on = Receive=20
I was able to receive East coast USA stations at = good=20 strength both on CW es SSB but they had difficulty or could not hear=20 me  running 400 Watts to the antenna.
When I changed over to a 1/4 wave inv L with a = vertical=20 height of 20 metres I was able to work every one that i could hear = including ZL=20 es VK plus all the W stns as far as W6/7 es VE7
Because the dipole was so low the angle of = radiation was=20 too high and the transmitted RF had fizzled out on long = haul.
Locally it was probably ok but this was not my=20 aim.
I have a 25 metre mast available at present and = thought=20 about an inv V dipole for 600 metres as an experiment but it would be so = low at=20 this frequency and exhibit high angle radiation that it would be useless = for=20 long haul but probably very good around EU
Apart from the fun of antenna experimentation on = LF/MF the=20 only approach is a Vertical system,  like an inv L or T to = guarantee all=20 round results both on TX es RX but especially Transmitting.
 
de mal/g3kev
 
 
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