Return-Path: Received: from mtain-dd07.r1000.mx.aol.com (mtain-dd07.r1000.mx.aol.com [172.29.64.147]) by air-dc10.mail.aol.com (v129.4) with ESMTP id MAILINDC104-86a84d27510471; Fri, 07 Jan 2011 12:44:36 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 27D46380003D3; Fri, 7 Jan 2011 12:44:34 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PbGLj-0002FD-0U for rs_out_1@blacksheep.org; Fri, 07 Jan 2011 17:43:39 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PbGLi-0002F4-IT for rsgb_lf_group@blacksheep.org; Fri, 07 Jan 2011 17:43:38 +0000 Received: from smtp208.alice.it ([82.57.200.104]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PbGLf-0007Mp-Qn for rsgb_lf_group@blacksheep.org; Fri, 07 Jan 2011 17:43:38 +0000 Received: from PCFausto (79.23.51.216) by smtp208.alice.it (8.5.124.08) id 4C1A27160E8E5DCD for rsgb_lf_group@blacksheep.org; Fri, 7 Jan 2011 18:43:29 +0100 Message-ID: <2D0BDC1472BA4EEA8AD1F31581A13965@PCFausto> From: "Fausto Coletti" To: Date: Fri, 7 Jan 2011 18:43:32 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: LF antenna Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01CBAE9A.C8AE16C0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, 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-sid: 3039ac1d40934d275102351d X-AOL-IP: 195.171.43.25 ------=_NextPart_000_002C_01CBAE9A.C8AE16C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi All,=20 today I did the first reception test with a matched antenna. I have sp= read about 150 meter of wire (four wires)=20 sloping from the top of my tower up to about 3 meter off the ground an= d=20 with another wire i have reached the shack through a open window (BRR!= ! today we have only +2=B0C).=20 I have connected the wire to my variometer then i have connected the= "cold" side of the inductance through=20 a ferrite transformer to ground. I used as a ground the tubes of heati= ng system of my house plus another wire=20 connected to eight ground rod.=20 I could easily tune the inductance and matching transformer.=20 Then i have compared the signal level of the unmatched 80m delta loop= withe the antenna on testing.=20 The results on DCF39 signal (measured at 16,35 UTC) are:=20 Unmatched Delta loop -62 dBm with -97dBm noise floor (S/N 35 dB)=20 Matched Marconi -37 dBm with -94dBm noise floor (S/N 57 dB)= =20 Whereas the four wire of the capacitance hat sloping close to ground= and therefore the effective=20 height of the antenna is reduced significantly and, also the vertical= part of the antenna is not exactly=20 vertical, in short for to be an ugly antenna i think the result is goo= d.=20 Tomorrow I will do the measurement during daylight for have a stable= result without fading then in next=20 days i start to build the definitive antenna (with capacitance hat as= little as sloping).=20 73, Fausto IK4NMF ------=_NextPart_000_002C_01CBAE9A.C8AE16C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi All,

today I did the first reception test= with a matched=20 antenna. I have spread about 150 me= ter of wire=20 (four wires)

sloping from the top of my tower = ;up to about 3=20 meter off the ground and

with another wire i have reached the= shack through=20 a open window (BRR!! today we have only +2=B0C).

I have connected the wire to my vario= meter then i=20 have connected the "cold" side of the inductance through

a ferrite transformer to ground.= I used as a=20 ground the tubes of heating system of my house plus another wire

connected to eight ground rod.

I could easily tune the inductance an= d matching=20 transformer.

Then i have compared the signal level= of the=20 unmatched 80m delta loop withe the antenna on testing.

The results on DCF39 signal (measured= at 16,35 UTC)=20 are:

Unmatched Delta loop = ; -62 dBm with=20 -97dBm noise floor (S/N 35 dB)

Matched=20 Marconi -3= 7 dBm with=20 -94dBm noise floor (S/N 57 dB)

Whereas the four wire of the capacita= nce hat=20 sloping close to ground and therefore the effective

height of the antenna is reduced sign= ificantly and,=20 also the vertical part of the antenna is not exactly

vertical, in short for to be an ugly= antenna i=20 think the result is good.

Tomorrow I will do the measurement du= ring daylight=20 for have a stable result without fading then in next

days i start to build the definitive= antenna (with=20 capacitance hat as little as sloping).

73, Fausto IK4NMF

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