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Message-ID: <E51C4983023B40F2B688D1849DE7F09B@lindavideo>
From: "Ken" <ken.h.wright@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <F88E4E7623D944FB9658C8C02D8A1B18@lindavideo> <4D1B7B17.2040007@iup.uni-heidelberg.de>
Date: Thu, 30 Dec 2010 10:24:00 -0000
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Subject: Re: LF: DK7FC's VLF Active Antenna
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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

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META content=3D"text/html; charset=3DISO-8859-1" http-equiv=3DContent=
-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18999"></HEAD>
<BODY bgColor=3D#ffffff text=3D#000000>
<DIV><FONT size=3D2 face=3DArial>Hi Stefan and all others.</FONT></DIV=
>
<DIV><FONT size=3D2 face=3DArial>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=
&nbsp;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&nbsp; order policy of =A320 whic=
h equates to=20
about 50&nbsp; 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.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>73s</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Ken</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>M0KHW</FONT></DIV>
<BLOCKQUOTE   style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT:=
 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"   dir=
=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV     style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:=
 black"><B>From:</B>=20
  <A title=3Dschaefer@iup.uni-heidelberg.de     href=3D"mailto:schaefe=
r@iup.uni-heidelberg.de">Stefan Sch=E4fer</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@=
blacksheep.org     href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_l=
f_group@blacksheep.org</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, December 29,=
 2010 6:16=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: LF: DK7FC's VLF=
 Active=20
  Antenna</DIV>
  <DIV><BR></DIV>Hi Ken, <BR><BR>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 ;-)<BR><BR>If you anyway want an alte=
rnative,=20
  the <U>J310</U> 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.<BR><BR>73,=20
  Stefan/DK7FC<BR><BR><BR><BR>Am 29.12.2010 17:58, schrieb Ken:=20
  <BLOCKQUOTE cite=3Dmid:F88E4E7623D944FB9658C8C02D8A1B18@lindavideo=
       type=3D"cite"><META name=3DGENERATOR content=3D"MSHTML 8.00.600=
1.18999">
    <STYLE></STYLE>

    <DIV><FONT size=3D2 face=3DArial>Stefan.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial>Could you please recommend an equ=
ivalent to to=20
    BF862 which is not Surface Mount for use in this circuit.</FONT></=
DIV>
    <DIV><FONT size=3D2 face=3DArial>73s</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial>Ken</FONT></DIV>
    <DIV><FONT size=3D2   face=3DArial>M0KHW</FONT></DIV></BLOCKQUOTE>=
</BLOCKQUOTE></BODY></HTML>

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