Return-Path: Received: from mtain-mk09.r1000.mx.aol.com (mtain-mk09.r1000.mx.aol.com [172.29.97.141]) by air-mc03.mail.aol.com (v129.4) with ESMTP id MAILINMC032-a8dc4d1c5e08291; Thu, 30 Dec 2010 05:25:12 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 29926380002C2; Thu, 30 Dec 2010 05:25:06 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PYFg6-0005VU-9t for rs_out_1@blacksheep.org; Thu, 30 Dec 2010 10:24:14 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PYFg5-0005VL-EN for rsgb_lf_group@blacksheep.org; Thu, 30 Dec 2010 10:24:13 +0000 Received: from nm21.bullet.mail.sp2.yahoo.com ([98.139.91.91]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PYFg4-0005Cr-7Y for rsgb_lf_group@blacksheep.org; Thu, 30 Dec 2010 10:24:13 +0000 Received: from [98.139.91.68] by nm21.bullet.mail.sp2.yahoo.com with NNFMP; 30 Dec 2010 10:24:05 -0000 Received: from [98.139.91.38] by tm8.bullet.mail.sp2.yahoo.com with NNFMP; 30 Dec 2010 10:24:04 -0000 Received: from [127.0.0.1] by omp1038.mail.sp2.yahoo.com with NNFMP; 30 Dec 2010 10:24:04 -0000 X-Yahoo-Newman-Id: 931969.3315.bm@omp1038.mail.sp2.yahoo.com Received: (qmail 35354 invoked from network); 30 Dec 2010 10:24:04 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=AY1I3dWL/NEU+aKOap4un1eX3Kp+BZaPwAN0Z3J6sbleAGqQeoMrpnYrEUQ4LWbWOXlZNlgm4TL7VBACUQiHtgRZuVZxa+gwsHuxg/r1KYO4RRMDBSKUM0AwnbEM3b8pvXhrJjN/ycDc/KPDlLWcofozuV+NHZIfRIICNWEL1lA= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1293704644; bh=PfrV+tHG1Sy8dtMliW8sg9N9FzyI8s67+5ME+77yBhI=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=WeC4WtNk/vT4FA2JJKOh83FqgpR97ae2C4h5kfw9V0bW/IY4GEkq6qjfgvEQXwKvg+c/5JfAQVy8efV88Tup2gRb5G0IGltO//UDUclmF6wTtvtZYelgnRXkNZjT1rJfyjZ0LrmKNw//cZYnAF2BIgMpl0iJx1fJRx61VTMtDBo= Received: from lindavideo (ken.h.wright@86.162.64.127 with login) by smtp132.mail.mud.yahoo.com with SMTP; 30 Dec 2010 02:24:03 -0800 PST X-Yahoo-SMTP: 9Y6mUHuswBAgnrOsukIiNdFDf95uy_Dz34nY1hlg2liKgYD952sjbg-- X-YMail-OSG: dEXJ6eoVM1lu1F8iPXDTp0n6cZyhmi2AiJOO7plwU2KcwHh ueT4__GMkta5q2kZ3LXlEtvWivYsl8250dgYiJyMM2kO7wrNJfvfkiObV0nO Ys8rOv6YD1k699qaujxFrztoHGADXSNx0MTxDkgDL0KPJoTanikB7YNscPJw sHSgM9k120zXonbpFv0b8doj.b9rm149kFG4aJatVv5YV3FFwsq_jX8TcZyD 4fmJvnoUwlxClQPPRjd00taexhGmQqcjofkhm6g5jiGKE1HezYG12815i51I 8xj7D_gNMO9blbyDqIfeZXXbZ4XGQ8iC_Vm6IkRL3vBWgvqkH0ykEzAfeSdK OYhXMi9BofQLOhIBtzZOZMp5wivDUT5Fnvu0G9nIOPc2ipSUUi0g- X-Yahoo-Newman-Property: ymail-3 Message-ID: From: "Ken" To: References: <4D1B7B17.2040007@iup.uni-heidelberg.de> Date: Thu, 30 Dec 2010 10:24:00 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 DomainKey-Status: good (testing) X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36,HTML_MESSAGE=0.001,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: DK7FC's VLF Active Antenna Content-Type: multipart/alternative; boundary="----=_NextPart_000_005A_01CBA80B.AC976260" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.9 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_30_40, HTML_MESSAGE,HTML_TITLE_EMPTY 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-AUTHENTICATION: mail_rly_antispam_dkim-d253.1 ; domain : btinternet.com DKIM : pass x-aol-sid: 3039ac1d618d4d1c5e023183 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_005A_01CBA80B.AC976260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan and all others. Thank you for your most useful replies, the reasons I asked this quest= ion are as follows, firstly I was hoping to construct one this weekend= possibly from components in my stock, a quick search on Google for UK= suppliers came up with Farnell and RS, phoned Farnell and was informe= d yes I could purchase but there is a minimum order policy of =A320= which equates to about 50 BF862s, I assume that RS is the same, I al= so looked on Ebay non were found. If anyone knows of a UK supplier whe= re I could purchase say 10 ff I would be grateful. 73s Ken M0KHW ----- Original Message -----=20 From: Stefan Sch=E4fer=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, December 29, 2010 6:16 PM Subject: Re: LF: DK7FC's VLF Active Antenna Hi Ken,=20 I have not tested other JFETs so far. Is it just because of the SMD= housing? I don't use a SMD PCB but a "free air" soldering. So if this= is the problem, just solder the FETs legs directly on the next part,= e.g. solder the drain directly on the 390 Ohm resistor. Attached you= find a picture that shows how my current used VLF grabber antenna loo= ks inside. Don't be shocked ;-) If you anyway want an alternative, the J310 or the (2SK170) should= be possible. There are some parameters like the noise and the gain an= d the input capacitance which are affecting the performance but this= is all not so critical on VLF. 73, Stefan/DK7FC Am 29.12.2010 17:58, schrieb Ken:=20 Stefan. Could you please recommend an equivalent to to BF862 which is not= Surface Mount for use in this circuit. 73s Ken M0KHW ------=_NextPart_000_005A_01CBA80B.AC976260 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan and all others.
Thank you for your most useful replie= s, the reasons=20 I asked this question are as follows, firstly I was hoping to construc= t one this=20 weekend possibly from components in my stock, a quick search on Google=  for=20 UK suppliers came up with Farnell and RS, phoned Farnell and was infor= med yes I=20 could purchase but there is a minimum  order policy of =A320 whic= h equates to=20 about 50  BF862s, I assume that RS is the same, I also looked on= Ebay non=20 were found. If anyone knows of a UK supplier where I could purchase sa= y 10 ff I=20 would be grateful.
 
73s
Ken
M0KHW
----- Original Message -----
Sent: Wednesday, December 29,= 2010 6:16=20 PM
Subject: Re: LF: DK7FC's VLF= Active=20 Antenna

Hi Ken,

I have not tested other JFETs so far.= Is it=20 just because of the SMD housing? I don't use a SMD PCB but a "free= air"=20 soldering. So if this is the problem, just solder the FETs legs dire= ctly on=20 the next part, e.g. solder the drain directly on the 390 Ohm resisto= r.=20 Attached you find a picture that shows how my current used VLF grabb= er antenna=20 looks inside. Don't be shocked ;-)

If you anyway want an alte= rnative,=20 the J310 or the (2SK170) should be possible. There are some= parameters=20 like the noise and the gain and the input capacitance which are affe= cting the=20 performance but this is all not so critical on VLF.

73,=20 Stefan/DK7FC



Am 29.12.2010 17:58, schrieb Ken:=20
Stefan.
Could you please recommend an equ= ivalent to to=20 BF862 which is not Surface Mount for use in this circuit.
73s
Ken
M0KHW
=
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