Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1738F38000094; Sun, 13 May 2012 13:40:15 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1STclZ-0000hI-68 for rs_out_1@blacksheep.org; Sun, 13 May 2012 18:39:33 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1STclY-0000gw-Jw for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:39:32 +0100 Received: from mail-qa0-f43.google.com ([209.85.216.43]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1STclV-0007yR-VY for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:39:31 +0100 Received: by qadb33 with SMTP id b33so3235791qad.16 for ; Sun, 13 May 2012 10:39:27 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=pMWkY6ThY6tgScJ/GRHEyGRgdQAZMMqOz9dNSqZTUcs=; b=Y7NN1TKWx2G4Lysr8h6JZSVt0G69hieIprXrIbtqrmfFlxCZh8HNIejrzVejDmjcdN n1OBBoiTJU25UKDrVBMkep0Zl+QYWBJO/+wxJeAquVOdJ+DFz+3O/Twlz8S4d62J/onf BeHA2WLF45Vq8zVaIdcdqoG9oN/xq8Hf9yAFh5XqvAlw4RT/fzb+PUN34jNfOwkWnkDa kIVhHhftpArft62vdNRPeiGiyYzGrBdRvkuEq5x6bMabmTNQgFTN0F+eofgd7uXTZkcW PD42B5nDkCmyeNw+vc9AnmeB+LqMk2tdSVf6MpRQhMy3SfxhLkHQ7d5zW18svheBWSBW +yJA== MIME-Version: 1.0 Received: by 10.224.44.130 with SMTP id a2mr8380024qaf.66.1336930767121; Sun, 13 May 2012 10:39:27 -0700 (PDT) Received: by 10.229.94.140 with HTTP; Sun, 13 May 2012 10:39:27 -0700 (PDT) Received: by 10.229.94.140 with HTTP; Sun, 13 May 2012 10:39:27 -0700 (PDT) In-Reply-To: References: <4FAFEA71.8030700@iup.uni-heidelberg.de> Date: Sun, 13 May 2012 13:39:27 -0400 Message-ID: From: Warren Ziegler To: rsgb_lf_group@blacksheep.org X-Spam-Score: 2.0 (++) 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: Should read "Lankford " ! Sorry! 73 K2ORS On May 13, 2012 1:38 PM, "Warren Ziegler" wrote: > Hi Stefan, > Your RX antenna looks very similar to the K9AY which has been used > Very successfully by many LF /MF operators for years. It is a little > difficult for me to picture the details as I am looking at it on my phone. > An excellent web site for such antennas is Dallas Langford's Yahoo group, > he has spent years optimizing similar antennas and has achieved results > superior to beverage antennas with some of phased loops. > I will send a link if you are interested when I get home. > 73 Warren K2ORS > > 73 K2ORS > On May 13, 2012 1:11 PM, "Stefan Schäfer" < > wrote: > >> Hello Group, >> >> I've just started to play a bit in EZNEC, trying to simulate a receive >> loop antenna for the new YV7MAE grabber. http://dl.dropbox.com/u/** >> 74746618/LF/YV7MAE_LF_Grabber.**html... still using a wire receive antenna with excellent results 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 elevation and >> 3D plot are surprising good. Maybe i have done a mistake in modelling? >> Optimal performance was obtained at R = 8 kOhm. This resulted in the best >> F/B and beamwidth... Results of ZENEC are here: http://dl.dropbox.com/u/* >> *19882028/LF/Cardioid%20for%**20LF.png >> >> Any ideas, experiance or advice? >> >> I guess a preamp is needed when such a antenna is used. The typical 1:9 >> un-un does not look useful for me... >> >> 73, Stefan/DK7FC >> >> [...] Content analysis details: (2.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.216.43 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (wd2xgj[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 2.6 FU_COMMON_SUBS2 URI: Sub-dir seen often in spam (2). 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 622b0ca3461797caf37867321c193763 Subject: Re: LF: Cardioid RX antenna for LF... Content-Type: multipart/alternative; boundary=20cf306f771076ac4e04bfee7345 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: 0:2:456091296:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m007.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60554faff1ff6a34 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --20cf306f771076ac4e04bfee7345 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Should read "Lankford " ! Sorry! 73 K2ORS On May 13, 2012 1:38 PM, "Warren Ziegler" wrote: > Hi Stefan, > Your RX antenna looks very similar to the K9AY which has been used > Very successfully by many LF /MF operators for years. It is a little > difficult for me to picture the details as I am looking at it on my phone= . > An excellent web site for such antennas is Dallas Langford's Yahoo group, > he has spent years optimizing similar antennas and has achieved results > superior to beverage antennas with some of phased loops. > I will send a link if you are interested when I get home. > 73 Warren K2ORS > > 73 K2ORS > On May 13, 2012 1:11 PM, "Stefan Sch=E4fer" < > Stefan.Schaefer@iup.uni-heidelberg.de> wrote: > >> Hello Group, >> >> I've just started to play a bit in EZNEC, trying to simulate a receive >> loop antenna for the new YV7MAE grabber. http://dl.dropbox.com/u/** >> 74746618/LF/YV7MAE_LF_Grabber.**html... still using a wire receive antenna with excelle= nt results 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 elevation a= nd >> 3D plot are surprising good. Maybe i have done a mistake in modelling? >> Optimal performance was obtained at R =3D 8 kOhm. This resulted in the b= est >> F/B and beamwidth... Results of ZENEC are here: http://dl.dropbox.com/u/= * >> *19882028/LF/Cardioid%20for%**20LF.png >> >> Any ideas, experiance or advice? >> >> I guess a preamp is needed when such a antenna is used. The typical 1:9 >> un-un does not look useful for me... >> >> 73, Stefan/DK7FC >> >> --20cf306f771076ac4e04bfee7345 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Should read "Lankford " !
Sorry!

73 K2ORS

On May 13, 2012 1:38 PM, "Warren Ziegler&qu= ot; <wd2xgj@gmail.com> wrote:=

Hi Stefan,
Your RX antenna looks very similar to the K9AY which has been used
Very successfully by many LF /MF operators for years.=A0=A0 It is a little = difficult for me to picture the details as I am looking at it on my phone.= =A0 An excellent web site for such antennas is Dallas Langford's Yahoo = group, he has spent years optimizing similar antennas and has achieved resu= lts superior to beverage antennas with some of phased loops.
I will send a link if you are interested when I get home.
73 Warren K2ORS

73 K2ORS

On May 13, 2012 1:11 PM, "Stefan Sch=E4fer&= quot; <Stefan.Schaefer@iup.uni-heidelberg.de> wrote:
Hello Group,

I've just started to play a bit in EZNEC, trying to simulate a receive = loop antenna for the new YV7MAE grabber. http://dl.dropbox.co= m/u/74746618/LF/YV7MAE_LF_Grabber.html ... still using a = wire receive antenna with excellent results but now a directional antenna i= s 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 elevation and 3D= plot are surprising good. Maybe i have done a mistake in modelling? Optima= l performance was obtained at R =3D 8 kOhm. This resulted in the best F/B a= nd beamwidth... Results of ZENEC are here: http://dl.dropbox= .com/u/19882028/LF/Cardioid%20for%20LF.png

Any ideas, experiance or advice?

I guess a preamp is needed when such a antenna is used. The typical 1:9 un-= un does not look useful for me...

73, Stefan/DK7FC

--20cf306f771076ac4e04bfee7345--