Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 17EF43800006E; Fri, 22 Jun 2012 10:37:08 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Si4xv-0005sm-9j for rs_out_1@blacksheep.org; Fri, 22 Jun 2012 15:36:03 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Si4xu-0005sZ-LP for rsgb_lf_group@blacksheep.org; Fri, 22 Jun 2012 15:36:02 +0100 Received: from nm24-vm0.bullet.mail.ird.yahoo.com ([212.82.109.239]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1Si4xr-00068V-WD for rsgb_lf_group@blacksheep.org; Fri, 22 Jun 2012 15:36:01 +0100 Received: from [77.238.189.54] by nm24.bullet.mail.ird.yahoo.com with NNFMP; 22 Jun 2012 14:35:58 -0000 Received: from [212.82.108.247] by tm7.bullet.mail.ird.yahoo.com with NNFMP; 22 Jun 2012 14:35:58 -0000 Received: from [127.0.0.1] by omp1012.mail.ird.yahoo.com with NNFMP; 22 Jun 2012 14:35:58 -0000 X-DKIM-Result: Domain=yahoo.com Result=Good and Known Domain X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 137126.16017.bm@omp1012.mail.ird.yahoo.com Received: (qmail 49473 invoked by uid 60001); 22 Jun 2012 14:35:57 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1340375757; bh=udFyNdZwSTCW0tQdrH+5SHHLJI91GiPY14i+bs1ztpg=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Lrxf1wd+dIIe2qvXP+GOUIkTL/TQ7w0uzYw4f+XvHUTh+JWCHneuHVWQb3rXFPCBLVDFWWUIEUlcW8v5+ct7NQxy+GT2iRmIaFALZoAOxdm13Pn6f1HOkA0TcVmiB9r0rY1SH7Q7WRPsa+2D+h9ro6vhSdQWNn/2tPMTCM0wpkI= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Bmv8RJVMuKNM3Ln/wHECZRfg+Bp1+1Sd01ssdjMWX5Qb8GYk7o7aZtxOpdASzL+Nx3zcior8DyUTmnCK0eJfQ3oCQ8fRIH52pjs8rg5kJcddDdAHMet5hV7tovvxP76YtRH/m0+EYWxUdaeeb8qf7N2MwIoaPbVCN1yJdy+F6W0=; X-YMail-OSG: eCHJ9LgVM1li0FrD21dNM5IpaPUR2lz8r.efyYVIUl_O9g2 otOnE4Vjtw4a8p0HwKVC2987Z1c0WjT8ukyCsBSiL4Ys2I5iBmWt.AJdypCh sC72sNz970Yhe_B3Ry_f6zSV69twFaSO.LunI8lrxXcWrzYBHDHnqIyEb23A 1PIARcfDQxWgalr_TmvGYHZPPhkfKbPNN.d4YctoMWL2phHPRKDYeaT2E69. 8oJbjMyh4x1sLvNbg1Mu5mDLkhD0DKEW.F985gH8eMofWEvXRD0JazsfJcyu 6mxNwocbswLlXdlNIPZ612Ks_75no9cXiCz74D2MicmCjx1Z1kxqvSPqFPJx D0JmNDTgB9zmHPIWVb71BIiyuloescTNL2Fn6_9NaLKi1W4inM4MfZdBngcd oAv5JawWVsDutybvyF0__PXSmMeJ0VhL9j0ApFsuiwKrdOApn_GlkqnEvoKy fXFUHtWGqJtzeJZFDSL_sRwiCMA_8xXyv1YczcoMiBDnzAPGGLwAfzgY- Received: from [151.99.187.181] by web29503.mail.ird.yahoo.com via HTTP; Fri, 22 Jun 2012 15:35:57 BST X-Mailer: YahooMailWebService/0.8.118.349524 References: <1340350943.68546.YahooMailNeo@web29504.mail.ird.yahoo.com> Message-ID: <1340375757.35583.YahooMailNeo@web29503.mail.ird.yahoo.com> Date: Fri, 22 Jun 2012 15:35:57 +0100 (BST) From: Daniele Tincani To: "rsgb_lf_group@blacksheep.org" In-Reply-To: MIME-Version: 1.0 X-Spam-Score: 1.0 (+) 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: Hello Victor, thanks for your reply. In fact, now I think I will use the 12AU7 for a hi-Z pre-amp for a whip or a tuned loop (this again is just for playing with that old glassy lady :-)). As for the BD139, I didn't even suspect it could be used in a RF preamp, I tought of it as good for power stages... 73 Daniele IZ5WWB [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.82.109.239 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (danieletincani[at]yahoo.com) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 1.0 FSL_FREEMAIL_1 FSL_FREEMAIL_1 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 7c7a1907d3a7d57b28660e5fb4c32107 Subject: Re: LF: RE: Ferrite broadband (LF-MF) antenna? Content-Type: multipart/alternative; boundary="-73641666-214777344-1340375757=:35583" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.5 required=5.0 tests=FORGED_YAHOO_RCVD,HTML_30_40, HTML_FONTCOLOR_BLUE,HTML_MESSAGE,MAILTO_TO_SPAM_ADDR, TO_ADDRESS_EQ_REAL 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: 0:2:418106560:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m002.1 ; domain : yahoo.com DKIM : fail x-aol-sid: 3039ac1d604e4fe4831457ea X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---73641666-214777344-1340375757=:35583 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hello Victor, thanks for your reply. In fact, now I think I will use the 12= AU7 for a hi-Z pre-amp for a whip or a tuned loop (this again is just for p= laying with that old glassy lady :-)). As for the BD139, I didn't even susp= ect it could be used in a RF preamp, I tought of it as good for power stage= s...=0A73=0ADaniele IZ5WWB=0A=0A=A0=0A =0A=0A______________________________= __=0A Da: "victor13@online.nl" =0AA: rsgb_lf_group@blac= ksheep.org =0AInviato: Venerd=EC 22 Giugno 2012 16:19=0AOggetto: LF: RE: Fe= rrite broadband (LF-MF) antenna?=0A =0A=0A =0AHello =0ADaniele, =0A=A0 =0A= some =0Amonths ago I made a broadbanded ferriterod to cope with heavy qrm o= n the 80 and =0A160m band.The ferite comes from a submarine and is specifie= d 10KHz to 4 MHZ with =0Aa symmetrical feedingcable to a ELK675 or other re= ceiver without a preamp.Since =0AI don't have such a receiver I made a bala= nced two stage amp with 4x BD139 =0Agrounded base.The antenna copes good wi= th the QRM on 80 and 160,it also performs =0Avery well on the MW broadcastb= and.In the range 200-500KHz it is sometimes better =0Athan the E-probe,belo= w 200KHz the E-probe wins.IM is no problem but maby the =0Anoise of the amp= is to high below 200KHz. =0AThe =0Aferriterod is about750X100mm! =0AI =0Ad= on't think the 12AU7 is a good choice for a low inputimpedance amp...Zinput= 2X =0ABD139 is about 3 Ohm. =0A=A0 =0A73 =0AGL =0AVictor =0APA3FNY =0A=A0 = =0A-----Oorspronkelijk bericht-----=0A>Van: owner-rsgb_lf_group@blacksheep.= org [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Daniele Tincani=0A>= Verzonden: vrijdag 22 juni 2012 9:42=0A>Aan: rsgb_lf_group@blacksheep.org= =0A>Onderwerp: LF: Ferrite broadband (LF-MF) antenna?=0A>=0A> =0A>Hello LF= , =0A>=0A>I apologize to you all for resuming a topic that was already larg= ely debated here. I have seven of those=A0quite known russian surplus ferr= ite rods (20cm x 1cm) and -=A0just for my fun - I'm planning to spend some= time in building an LF-MF antenna with them. I would like to obtain a=A0= broadband (untuned) antenna, ideally VLF-LF=A0and/or LF-MF, suitable for o= utdoor installation, so what I would appreciate some suggestions about is = the required low-impedance amplifier, similar to those used in air-core br= oadband loops, if it does make sense of course. Any ideas? I found an unuse= d 12AU7 in=A0my drawer, could=A0it be effectively=A0chosen as the active = device (low voltage)=A0for=A0such amplifier?=0A> =0A>Thank you for any feed= back =0A>73 =0A>Daniele IZ5WWB =0A> ---73641666-214777344-1340375757=:35583 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hello Victor, thanks for your reply. In fact, now I think I will use the = 12AU7 for a hi-Z pre-amp for a whip or a tuned loop (this again is just for= playing with that old glassy lady :-)). As for the BD139, I didn't even su= spect it could be used in a RF preamp, I tought of it as good for power sta= ges...
73
Daniele IZ5WWB
<= /span>
 

Da: "victor13@online.nl" <victor13@online.nl&= gt;
A: rsgb_lf_group@b= lacksheep.org
Inviato: Venerd=EC 22 Giugno 2012 16:19
= Oggetto: LF: RE: Ferrite broadband (LF-MF) antenna?
 =

=0A=0A =0A =0A
=0A
Hel= lo =0ADaniele,
=0A
 
=0A
some =0Amonths ago I made a = broadbanded ferriterod to cope with heavy qrm on the 80 and =0A160m band.Th= e ferite comes from a submarine and is specified 10KHz to 4 MHZ with =0Aa s= ymmetrical feedingcable to a ELK675 or other receiver without a preamp.Sinc= e =0AI don't have such a receiver I made a balanced two stage amp with 4x B= D139 =0Agrounded base.The antenna copes good with the QRM on 80 and 160,it = also performs =0Avery well on the MW broadcastband.In the range 200-500KHz = it is sometimes better =0Athan the E-probe,below 200KHz the E-probe wins.IM= is no problem but maby the =0Anoise of the amp is to high below 200KHz.
=0A
The =0Aferriterod is about7= 50X100mm!
=0A
I =0Adon't thin= k the 12AU7 is a good choice for a low inputimpedance amp...Zinput 2X =0ABD= 139 is about 3 Ohm.
=0A
 
=0A
73
= =0A
GL
=0A
Victor
=0A
PA3FNY<= /font>
=0A
=  =0A
=0A
-----Oorspronkelijk bericht-----
Van: =0A = owner-rsgb_lf_group@blacksheep.org =0A [mailto:owner-rsgb_lf_group@blacks= heep.org]Namens Daniele =0A Tincani
Verzonden: vrijdag 22= juni 2012 9:42
Aan: =0A rsgb_lf_group@blacksheep.org
Onde= rwerp: LF: Ferrite broadband =0A (LF-MF) antenna?

= =0A
=0A
Hello LF,
=0A
 
=0A
I apol= ogize to you all for resuming a topic that was already largely =0A debated= here. I have seven of those quite known russian surplus ferrite =0A = rods (20cm x 1cm) and - just for my fun - I'm planning to spend some t= ime =0A in building an LF-MF antenna with them. I would like to obtain =0A= a broadband (untuned) antenna, ideally VLF-LF and/or LF-MF, sui= table =0A for outdoor installation, so what I would appreciate some sugges= tions about is =0A the required low-impedance amplifier, similar to those = used in air-core =0A broadband loops, if it does make sense of course. Any= ideas? I found an unused =0A 12AU7 in my drawer, could it be ef= fectively chosen as the =0A active device (low voltage) for = ;such amplifier?
=0A
Thank you for any feedback
=0A 73
=0A
Daniele IZ5WWB
=0A
 
=0A


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