Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 023F8380000C4; Tue, 3 Jan 2012 17:44:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RiD5A-0006bh-CM for rs_out_1@blacksheep.org; Tue, 03 Jan 2012 22:43:48 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RiD59-0006bY-UE for rsgb_lf_group@blacksheep.org; Tue, 03 Jan 2012 22:43:47 +0000 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RiD57-0005qo-FM for rsgb_lf_group@blacksheep.org; Tue, 03 Jan 2012 22:43:47 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgQJAFOEA09cHnPn/2dsb2JhbABDggWWB5RUgQaBbQUBAQUIAQEDSQIUCg4BAQMFAgEDEQQBAQolFAEEGgYWCAYTCgECAgEBh2u1T4h1gxoEglqFKoUsAZoF X-IronPort-AV: E=Sophos;i="4.71,452,1320624000"; d="scan'208,217";a="376225014" Received: from host-92-30-115-231.as13285.net (HELO xphd97xgq27nyf) ([92.30.115.231]) by out1.ip01ir2.opaltelecom.net with SMTP; 03 Jan 2012 22:43:38 +0000 Message-ID: <00d901ccca69$1f897260$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <008301ccc97c$51d9fcf0$0401a8c0@xphd97xgq27nyf>, ,<003501ccca06$6bdef490$0401a8c0@xphd97xgq27nyf> <4F02F9EA.1090101@iup.uni-heidelberg.de> <004601ccca20$8aa7d1c0$0401a8c0@xphd97xgq27nyf> <00fc01ccca65$47277e60$1502a8c0@Clemens04> Date: Tue, 3 Jan 2012 22:43:32 -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: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Antennas Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D6_01CCCA69.1F230F70" 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_40_50,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: 0:2:489386784:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d410e4f0384cc1c21 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_00D6_01CCCA69.1F230F70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Merchant ships used inv L antennas slung between two masts and in some = cases additional long whips for MF/HF. Aircraft also used inv L and long = wire antennas strung between the cockpit and the top of the tail fin for = MF/HF plus a trailing antenna that could be wound in/out as required. No pocket micro or ferrite sticks used. Some early aircraft also had a = small loop antenna for DF purposes. I know why fixed services used large wire arrays, for directivity and = gain and switchable in direction in some cases but not so sure others = did.=20 A tuned loop on a Battleship could be tricky with all the metal about.=20 mal/g3kev ----- Original Message -----=20 From: Clemens Paul=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, January 03, 2012 10:15 PM Subject: Re: LF: Antennas Mal, >Why do commercial receiving stations use large antenna farms out in = the countryside ??=20 The reason is to get as much *directivity* gain as possible. BTW british military vessels since decades used to use tuned loops = with a preamp for VFL/LW/MW operation. And they operated also in CW in those days... 73 Clemens DL4RAJ ----- Original Message -----=20 From: mal hamilton=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, January 03, 2012 3:03 PM Subject: Re: LF: Antennas 4120 - Ausgabedatum: 03.01.2012=20 ------=_NextPart_000_00D6_01CCCA69.1F230F70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Merchant ships used inv L antennas slung between = two masts=20 and in some cases additional long whips for MF/HF. Aircraft also used = inv L and=20 long wire antennas strung between the cockpit and the top of the = tail fin=20 for MF/HF plus a trailing antenna that could be wound in/out as=20 required.
No pocket micro or ferrite sticks used. Some = early=20 aircraft also had a small loop antenna for DF purposes.
I know why fixed services used large wire = arrays, =20  for directivity and gain and switchable in direction in some=20 cases but not so sure others did. 
A tuned loop on a Battleship could be tricky = with all the=20 metal about.
 
mal/g3kev
 
----- Original Message -----
From:=20 Clemens = Paul
Sent: Tuesday, January 03, 2012 = 10:15=20 PM
Subject: Re: LF: Antennas

Mal,
 
>Why do commercial receiving stations use = large=20 antenna farms out in the countryside ??
 
The reason is to get as much *directivity* = gain as=20 possible.
BTW british military vessels since = decades used=20 to use tuned loops with a preamp
for VFL/LW/MW operation.
And they operated also in CW in those=20 days...
 
73
Clemens
DL4RAJ
----- Original Message -----
From:=20 mal=20 hamilton
To: rsgb_lf_group@blacksheep.org= =20
Sent: Tuesday, January 03, = 2012 3:03=20 PM
Subject: Re: LF: = Antennas

4120 - Ausgabedatum: 03.01.2012=20
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