Return-Path: Received: from rly-db07.mx.aol.com (rly-db07.mail.aol.com [172.19.130.82]) by air-db05.mail.aol.com (v121.4) with ESMTP id MAILINDB051-ad34795fe022be; Tue, 22 Jan 2008 09:30:34 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db07.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDB071-ad34795fe022be; Tue, 22 Jan 2008 09:30:28 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JHK8i-0005qp-NH for rs_out_1@blacksheep.org; Tue, 22 Jan 2008 14:30:12 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JHK8i-0005qg-9E for rsgb_lf_group@blacksheep.org; Tue, 22 Jan 2008 14:30:12 +0000 Received: from imo-m13.mx.aol.com ([64.12.143.101] helo=imo-m13.mail.aol.com) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JHK8g-0008Hd-BA for rsgb_lf_group@blacksheep.org; Tue, 22 Jan 2008 14:30:12 +0000 Received: from GandalfG8@aol.com by imo-m13.mx.aol.com (mail_out_v38_r9.3.) id l.d51.1fa81368 (65100) for ; Tue, 22 Jan 2008 09:29:30 -0500 (EST) From: GandalfG8@aol.com Message-ID: Date: Tue, 22 Jan 2008 09:29:29 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5035 X-Spam-Flag: NO X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: Re: LF: Fenceline longwire Content-Type: multipart/alternative; boundary="-----------------------------1201012169" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_30_40,HTML_MESSAGE, NO_REAL_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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : + -------------------------------1201012169 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 22/01/2008 14:00:59 GMT Standard Time, rik.strobbe@fys.kuleuven.be writes: I simulated the fence wire with MMANA. On HF (80m, 40m) I got the expected (bi)directivity and low offset angle. But on 500kHz the horizontal pattern is almost omnidirectional and the offset angle is 78 degrees. It seems that (at least in theory) even 1200 foot is too short to be long on 500kHz ... Or does MMANA not work properly ? -------------------------------- If you accept the commonly held definition that a long wire should be at least a wavelength long at the desired frequency that implies that at 500 KHz it should be 600 metres, which is approximately 1960 feet. On that basis 1200 feet is going to be a bit short to be strictly considered a "long wire" on 500 KHz, but I certainly wouldn't mind having that much room to play with:-) regards Nigel GM8PZR -------------------------------1201012169 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 22/01/2008 14:00:59 GMT Standard Time,=20 rik.strobbe@fys.kuleuven.be writes:

I=20 simulated the fence wire with MMANA.
On HF (80m, 40m) I got the=20 expected (bi)directivity and low offset angle.
But on 500kHz the horizo= ntal=20 pattern is almost omnidirectional and
the offset angle is 78=20 degrees.
It seems that (at least in theory) even 1200 foot is too short= to=20 be
long on 500kHz ...
Or does MMANA not work properly=20 ?

--------------------------------

If you accept the commonly held definition that a long wire should= be=20 at least a wavelength long at the desired frequency that implies that at 500= KHz=20 it should be 600 metres, which is approximately 1960 feet.

On that basis 1200 feet is going to be a bit short to be strictly=20 considered a "long wire" on 500 KHz, but I certainly wouldn't mind having th= at=20 much room to play with:-)

regards

Nigel

GM8PZR

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