Return-Path: Received: from mtain-dg08.r1000.mx.aol.com (mtain-dg08.r1000.mx.aol.com [172.29.65.16]) by air-da06.mail.aol.com (v129.4) with ESMTP id MAILINDA062-86164d1cd7841f8; Thu, 30 Dec 2010 14:03:32 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg08.r1000.mx.aol.com (Internet Inbound) with ESMTP id BDB3138000086; Thu, 30 Dec 2010 14:03:30 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PYNlj-00024s-DN for rs_out_1@blacksheep.org; Thu, 30 Dec 2010 19:02:35 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PYNli-00024j-PF for rsgb_lf_group@blacksheep.org; Thu, 30 Dec 2010 19:02:34 +0000 Received: from mail-iw0-f171.google.com ([209.85.214.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PYNlf-0000FN-HY for rsgb_lf_group@blacksheep.org; Thu, 30 Dec 2010 19:02:34 +0000 Received: by iwn2 with SMTP id 2so11210797iwn.16 for ; Thu, 30 Dec 2010 11:02:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=X/tqxHVQWG/4GX5boIJYSToh/QeRIMsOY6+Ufi6T3EU=; b=ctd+EcEI1pBgXBOTWgFLBnwmRbEsU6d6yvd9PHHj1z3YSGeEwhed/rNA0yBvrxU0Xb 5nbAf6IgqZc7Fc0YFJpcSiNeaefzf1HfTAtsXDLLmZX6WqcUj1cZjShtBWGefZ1S1iEY XeAQPvZM9MdpM8gWFmI1aMqxkasVichs5XwRg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=clxVE7cOtMj+9buotYcAJHDoqEGU/yP6EkFSNvsixYB/2jm6F1Nr1dUe0Ru+ihlIJp NvGtCjhiTM7YOKfFt6aZoI0+GT5tKxTjCerOxFAvtqS11WpmRQjROqDs+L6fZLHkC6RR PBZlfOe06qiAVgZraDc6WKdO71gHUy9yJWUaQ= MIME-Version: 1.0 Received: by 10.231.32.76 with SMTP id b12mr203255ibd.162.1293735749359; Thu, 30 Dec 2010 11:02:29 -0800 (PST) Received: by 10.231.200.211 with HTTP; Thu, 30 Dec 2010 11:02:29 -0800 (PST) In-Reply-To: <580115.53843.qm@web28108.mail.ukl.yahoo.com> References: <4D1B7B17.2040007@iup.uni-heidelberg.de> <580115.53843.qm@web28108.mail.ukl.yahoo.com> Date: Thu, 30 Dec 2010 19:02:29 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: DK7FC's VLF Active Antenna Content-Type: multipart/alternative; boundary=0022152d6f61c61a470498a5531b X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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-AUTHENTICATION: mail_rly_antispam_dkim-d224.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d41104d1cd78265c5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --0022152d6f61c61a470498a5531b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Investigate RF Padboard :...... http://cgi.ebay.ie/RF-Matrix-PadBoard-149x114x1-6-Prototype-Circuit-Board-= /170573074927 Designed specifically for mixing SMT and ancient in the same design Andy www.g4jnt.com On 30 December 2010 18:45, M0FMT wrote: > I doubt that leaded components will ever go out of fashion not while= we > have China and Russia knocking huge amounts of parts. We can still get > thermionic devices brand new so never fear the good old clunky stuff wil= l be > around all our life times (definitely my life time anyway...hee) > > However I would recommend SMT construction it's not as bad as people wou= ld > have you believe! That article in the Radcom a year or so back must have > scared most amateurs off ever trying to use SMT. Talking to local statio= ns > on VHF it is something not even to be attempted which IMHO is a pitty.= The > only issue is creating the pads. I have found the best way without optic= ally > developed resist is to coat the board with resist and using a steel poin= ter > like a scriber but with a finer point scribe through the resist aided wi= th a > steel rule, after first laying out the circuit with a fine pencil. > Then enticing the board and removing the resist with a wire wool of solv= ent. > (Its amazing how fine a gap you can make that way) This is fine for a fe= w > IC's but becomes progressively more difficult the more complicated the > circuit, where a properly laid out board is require in my opinion. But= for > small circuit layouts it quite easy and dare I say quicker than poking= wires > through drilled holes in the board. Also, to know doubt howls of protes= t, > it is possible to dead bug SMT parts. > I use a big Maplin lighted magnifier and a =A36-00 Maplin soldering iron > solder sucker and solder wick, it all works a treat. > > 73 es GL petefmt > > > I support www.NotSpotTelecom.Com your > community Telco / ISP. > > > ------------------------------ > *From:* Andy Talbot > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Wed, 29 December, 2010 23:52:23 > *Subject:* Re: LF: DK7FC's VLF Active Antenna > > It won't be long before leaded components become unavailable. Certainly > the useful modern ones that actually do teh job that's wanted. I've > compared availability and prices in the Farnell catalogue recently (havi= ng > just got the almost cubic shaped printed version :-) and leaded compon= ents > are just more expensive and less available that SMT equivalent. And= the > bulk ordering quantities available on many of them make ordering less th= an > 100 off of some of the more popular ones just a waste of money. > > Constructors really will have to start getting used to using SMT devices > are their first choice every time. Start practicing now before you're > forced to. > > Andy > www.g4jnt.com > > been using SMT components for preference for something like 15 years now= . > > > > > 2010/12/29 Stefan Sch=E4fer > >> Hi Ken, >> >> 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. sold= er >> the drain directly on the 390 Ohm resistor. Attached you find a picture= that >> shows how my current used VLF grabber antenna looks inside. Don't be sh= ocked >> ;-) >> >> If you anyway want an alternative, the *J310* or the (2SK170) should be >> possible. There are some parameters like the noise and the gain and 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: >> >> Stefan. >> Could you please recommend an equivalent to to BF862 which is not Surfa= ce >> Mount for use in this circuit. >> 73s >> Ken >> M0KHW >> >> > > --0022152d6f61c61a470498a5531b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
=A0
Designed specifically for mixing SMT and ancient in the same design
=A0
Andy
=A0


=A0
On 30 December 2010 18:45, M0FMT <m0fmt@yahoo.co.uk> wrote:
I doubt that leaded components will ever go out of fashion not while= we have China and Russia knocking huge amounts of parts. We can still get= thermionic devices brand new so never fear the good old clunky stuff will= be around all our life times (definitely my life time anyway...hee)
=A0
However=A0I would recommend SMT construction it's not as bad as= people would have you believe! That article in the=A0Radcom a year or so= back must have scared=A0most amateurs off ever trying to use SMT. Talking= to local stations on VHF it is something not even to be attempted which= IMHO is a pitty. The only issue is creating the pads. I have found the be= st way without=A0optically developed resist is to coat the board with resi= st and using a steel pointer like a scriber but with a finer point scribe= through the resist aided with a steel rule, after first laying out the ci= rcuit with a fine pencil. Then=A0enticing the=A0board and removing the res= ist with a wire wool of solvent. (Its amazing how fine a=A0gap you can mak= e that way)=A0This is fine for a few IC's but becomes progressively mo= re difficult the more complicated the circuit,=A0where a properly=A0laid= out board is require in my opinion. But for small circuit layouts it quit= e easy and dare=A0I say quicker than poking wires through drilled =A0holes= in the board. Also, to=A0know doubt howls of protest, it is possible to= dead bug SMT parts.
I use a big Maplin lighted magnifier and a =A36-00=A0Maplin soldering= iron solder sucker and solder wick, it all works a treat.
=A0
73= es GL petefmt=20


I support www.NotSpotTelecom.Com your community Telco / ISP.=20


From: Andy Talbot <andy.g4jnt@gmail.c= om>
To: rsgb_lf_group@b= lacksheep.org
Sent: Wed, 29 December, 20= 10 23:52:23
Subject: Re= : LF: DK7FC's VLF Active Antenna

It won't be long before leaded components become unavailable.=A0= Certainly the useful modern ones that actually do teh job that's want= ed.=A0=A0 I've compared availability and prices in the Farnell catalog= ue recently (having just got the almost cubic shaped printed version :-)= =A0=A0 and leaded components are just more expensive and less available th= at SMT equivalent.=A0=A0=A0 And the bulk ordering quantities available on= many=A0of them=A0make ordering less than 100 off of some of the more popu= lar ones just a waste of money.=A0=A0=A0
=A0
Constructors really will have to start getting used to using SMT devi= ces are their first choice every time.=A0 Start practicing now before you&= #39;re forced to.
=A0
Andy
=A0
been using SMT components for preference for something like 15 years= now.
=A0


=A0
2010/12/29 Stefan Sch=E4fer &= lt;schaefer@iup.uni-heidelberg.de>
Hi Ken,

I have not tested other JFETs so far. Is it just beca= use of the SMD housing? I don't use a SMD PCB but a "free air&quo= t; soldering. So if this is the problem, just solder the FETs legs directl= y 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 looks inside. Don't be shocked ;-)

If you anyway want an alternative, the J310 or the (2SK170) sho= uld be possible. There are some parameters like the noise and the gain and= 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 equival= ent to to BF862 which is not Surface Mount for use in this circuit.=
73s
Ken
M0KHW
=



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