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=Ae4WOF+WclfjZAkNGteaWrMvdzHAi1fjayL3GL6WVDE2Alc4nJ9ZkXfdjJ6SjL78Xn
         cgxb5TmxGIynPORGy9cCTO/IsXXQWe4KSvj2S2T0WyeJmpiwWTXIC8PaOjhRLEeYIpno
         8udIXVTqS/JeuSuf1wQAOy8ezlwZv6CZmE/ho=
MIME-Version: 1.0
In-Reply-To: <4D1B7B17.2040007@iup.uni-heidelberg.de>
References: <F88E4E7623D944FB9658C8C02D8A1B18@lindavideo>
	<4D1B7B17.2040007@iup.uni-heidelberg.de>
Date: Wed, 29 Dec 2010 23:52:23 +0000
Message-ID: <AANLkTin-D6g41_6R=Onu+0xWD6R9_H+L08RaogtqMspD@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: DK7FC's VLF Active Antenna
Content-Type: multipart/alternative; boundary=00032557a2bab34f8904989542ff
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--00032557a2bab34f8904989542ff
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

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 (having just got
the almost cubic shaped printed version :-)   and leaded components are ju=
st
more expensive and less available that SMT equivalent.    And the bulk
ordering quantities available on many of them make ordering less than 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 <schaefer@iup.uni-heidelberg.de>

> 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. solde=
r
> 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 sho=
cked
> ;-)
>
> 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 no=
t 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 Surfac=
e
> Mount for use in this circuit.
> 73s
> Ken
> M0KHW
>
>

--00032557a2bab34f8904989542ff
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div>It won&#39;t be long before leaded components become unavailable.=A0=
 Certainly the useful modern ones that actually do teh job that&#39;s want=
ed.=A0=A0 I&#39;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 </div>

<div>=A0</div>
<div>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.</div>
<div>=A0</div>
<div>Andy</div>
<div><a href=3D"http://www.g4jnt.com/">www.g4jnt.com</a></div>
<div>=A0</div>
<div>been using SMT components for preference for something like 15 years=
 now.</div>
<div>=A0</div>
<div><br><br>=A0</div>
<div class=3D"gmail_quote">2010/12/29 Stefan Sch=E4fer <span dir=3D"ltr">&=
lt;<a href=3D"mailto:schaefer@iup.uni-heidelberg.de">schaefer@iup.uni-heid=
elberg.de</a>&gt;</span><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div text=3D"#000000" bgcolor=3D"#ffffff">Hi Ken, <br><br>I have not teste=
d other JFETs so far. Is it just because of the SMD housing? I don&#39;t=
 use a SMD PCB but a &quot;free air&quot; soldering. So if this is the pro=
blem, 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 looks inside. Don&#39;t be=
 shocked ;-)<br>
<br>If you anyway want an alternative, the <u>J310</u> 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.<br>
<br>73, Stefan/DK7FC<br><br><br><br>Am 29.12.2010 17:58, schrieb Ken:=20
<div>
<div></div>
<div class=3D"h5">
<blockquote type=3D"cite">
<div><font size=3D"2" face=3D"Arial">Stefan.</font></div>
<div><font size=3D"2" face=3D"Arial">Could you please recommend an equival=
ent to to BF862 which is not Surface Mount for use in this circuit.</font>=
</div>
<div><font size=3D"2" face=3D"Arial">73s</font></div>
<div><font size=3D"2" face=3D"Arial">Ken</font></div>
<div><font size=3D"2" face=3D"Arial">M0KHW</font></div></blockquote></div>=
</div></div></blockquote></div><br>

--00032557a2bab34f8904989542ff--