Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me01.r1000.mx.aol.com (Internet Inbound) with ESMTP id E1CA93800009B; Sun, 13 May 2012 13:42:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1STcna-0000qh-Jw for rs_out_1@blacksheep.org; Sun, 13 May 2012 18:41:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1STcna-0000qV-3Q for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:41:38 +0100 Received: from smtpout2.laposte.net ([193.253.67.227] helo=smtpout.laposte.net) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1STcnY-00081f-4H for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:41:36 +0100 Received: from wwinf8305 ([10.99.54.221]) by mwinf8503-out with ME id 9Vha1j0024mN4ju03VhaZq; Sun, 13 May 2012 19:41:34 +0200 Date: Sun, 13 May 2012 19:41:34 +0200 From: "manginbenoit.pro" To: rsgb_lf_group@blacksheep.org Message-ID: <816458997.166418.1336930894168.JavaMail.www@wwinf8305> In-Reply-To: <4FAFEA71.8030700@iup.uni-heidelberg.de> References: <4FAFEA71.8030700@iup.uni-heidelberg.de> MIME-Version: 1.0 X-Originating-IP: [82.246.206.85] X-Wum-Nature: EMAIL-NATURE X-WUM-FROM: |~| X-WUM-TO: |~| X-WUM-REPLYTO: |~| X-Spam-Score: -0.0 (/) 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: GE Stefan and all, Try and see Jean-Pierre / F1AFJ 's page, he built and modeled a 2-turn K9AY, the one he uses for his grabber. Nothing to say about performance, it seems. Judge it by the summer T/A captures... Plus, (I did not test it) his QSD RX es MMIC preamp seems to work VY FB. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [193.253.67.227 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (manginbenoit.pro[at]laposte.net) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: f64a6c8ea7591cecbecc6db95ffdd328 Subject: Re:LF: Cardioid RX antenna for LF... Content-Type: multipart/alternative; boundary="----=_Part_166417_400234143.1336930894165" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=CELL_PHONE_BOOST,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: 0:2:455430848:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60894faff27b4474 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_Part_166417_400234143.1336930894165 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable GE Stefan and all, Try and see Jean-Pierre / F1AFJ 's page, he built and modeled a 2-turn K9AY= , the one he uses for his grabber. Nothing to say about performance, it seems. Judge it by the summer T/A capt= ures... Plus, (I did not test it) his QSD RX es MMIC preamp seems to work V= Y FB. I tried a 2-turn K9AY for 160, but it is definetely too long, there is too = much wire. 0,2 lambdas seems to be a maximum. Voltage levels are correct bu= t directionnal properties degrade seriously. Nevermind on 137, we will never reach a quarter-wave long RX antenna !!! Maybe a 2-turn Flag should be tested ? Does anybody use MMANA ? I can try a= nd model one using this software. I don't use EZNEC at all. de F8GRY/Ben > Message du 13/05/12 19:12 > De : "Stefan Sch=C3=A4fer"=20 > A : rsgb_lf_group@blacksheep.org > Copie =C3=A0 :=20 > Objet : LF: Cardioid RX antenna for LF... > > Hello Group, >=20 > I've just started to play a bit in EZNEC, trying to simulate a receive=20 > loop antenna for the new YV7MAE grabber.=20 > http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ... still=20 > using a wire receive antenna with excellent results but now a=20 > directional antenna is needed. >=20 > So i modelled a loop with a possible shape and a ground connection. Then= =20 > i added a R on the far end of the source. The results of the elevation=20 > and 3D plot are surprising good. Maybe i have done a mistake in=20 > modelling? Optimal performance was obtained at R =3D 8 kOhm. This resulte= d=20 > in the best F/B and beamwidth... Results of ZENEC are here:=20 > http://dl.dropbox.com/u/19882028/LF/Cardioid%20for%20LF.png >=20 > Any ideas, experiance or advice? >=20 > I guess a preamp is needed when such a antenna is used. The typical 1:9= =20 > un-un does not look useful for me... >=20 > 73, Stefan/DK7FC >=20 >=20 Une messagerie gratuite, garantie =C3=A0 vie et des services en plus, =C3= =A7a vous tente ? Je cr=C3=A9e ma bo=C3=AEte mail www.laposte.net ------=_Part_166417_400234143.1336930894165 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable GE Stefan and all,

Try and see Jean-Pierre / F1AFJ 's page, he b= uilt and modeled a 2-turn K9AY, the one he uses for his grabber.

Nothing to say about performance, it seems. Judge it by the summer T/A cap= tures... Plus, (I did not test it) his QSD RX es MMIC preamp seems to work = VY FB.

I tried a 2-turn K9AY for 160, but it is define= tely too long, there is too much wire. 0,2 lambdas seems to be a maximum. V= oltage levels are correct but directionnal properties degrade seriously.
Nevermind on 137, we will never reach a quarter-wave long RX anten= na !!!

Maybe a 2-turn Flag should be tested ? Does anybody use M= MANA ? I can try and model one using this software.

I don't use = EZNEC at all.

de F8GRY/Ben




> Message du 13/05/12 19:12
> De : "Stefan Schä= fer"
> A : rsgb_lf_group@blacksheep.org
> Copie &agra= ve; :
> Objet : LF: Cardioid RX antenna for LF...
>
&= gt; Hello Group,
>
> I've just started to play a bit in EZ= NEC, trying to simulate a receive
> loop antenna for the new YV7MA= E grabber.
> http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber= .html ... still
> using a wire receive antenna with excellent resu= lts but now a
> directional antenna is needed.
>
>= ; So i modelled a loop with a possible shape and a ground connection. Then =
> i added a R on the far end of the source. The results of the ele= vation
> and 3D plot are surprising good. Maybe i have done a mist= ake in
> modelling? Optimal performance was obtained at R =3D 8 kO= hm. This resulted
> in the best F/B and beamwidth... Results of ZE= NEC are here:
> http://dl.dropbox.com/u/19882028/LF/Cardioid%20for= %20LF.png
>
> Any ideas, experiance or advice?
> <= br />> I guess a preamp is needed when such a antenna is used. The typic= al 1:9
> un-un does not look useful for me...
>
>= 73, Stefan/DK7FC
>
> ------=_Part_166417_400234143.1336930894165--