Message-ID: <015001ccd4b2$fac2cf40$8d01a8c0@JAYDELL>
From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4F14B612.2080009@iup.uni-heidelberg.de>
Date: Mon, 16 Jan 2012 19:57:25 -0500
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Subject: LF: Re: Beacon to the west... / TA
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Stefan

>If someone wants to report about the signal, it is welcome :-)

Big 'welding google' signal at the moment ... 
http://www.w1vd.com/grabber.html .

Jay W1VD  WD2XNS  WE2XGR/2
  ----- Original Message ----- 
  From: Stefan Schäfer
  To: rsgb_lf_group@blacksheep.org
  Sent: Monday, January 16, 2012 6:43 PM
  Subject: LF: Beacon to the west... / TA


  Hello LF group,

  After a break of 2 days on LF, which is VERY long for me, i am back on 
about 136.172. I've done various changes on the circuit and even use another 
VFO (the DDS is used in the first VLF experiments). It is running on 
batteries and i just opened the windows to the shack so there may be a 
little drift.
  I'm back with -3 dB f.s. and its frozen outside! :-)
  This is the last pair (4 pcs.) of FETs and i will go back to the IRFP460 
then. However i found there is also a IRFP460A which looks a bit more 
suitable for such critical switch mode applications. I've already ordered 20 
pcs of them ;-) The FETs i'm using right now have rise and fall times below 
10 ns which may be even worse in this application. But maybe the actual 
reason why they blow up is a completely different. Thus i will test the DDS 
now (no phase glitches)...

  If someone wants to report about the signal, it is welcome :-)

  73, Stefan/DK7FC



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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3Dcontent-type content=3D"text/html; =
charset=3DISO-8859-15">
<META content=3D"MSHTML 6.00.2900.2180" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY text=3D#000000 bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Stefan</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&gt;<FONT face=3D"Times New Roman" =
size=3D3>If someone=20
wants to report about the signal, it is welcome :-)</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Big 'welding google' signal at the =
moment ... <A=20
href=3D"http://www.w1vd.com/grabber.html">http://www.w1vd.com/grabber.htm=
l</A>&nbsp;.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Jay W1VD&nbsp; WD2XNS&nbsp; =
WE2XGR/2</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DStefan.Schaefer@iup.uni-heidelberg.de=20
  href=3D"mailto:Stefan.Schaefer@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=20
  =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, January 16, 2012 =
6:43=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: Beacon to the =
west... /=20
  TA</DIV>
  <DIV><BR></DIV>Hello LF group, <BR><BR>After a break of 2 days on LF, =
which is=20
  VERY long for me, i am back on about 136.172. I've done various =
changes on the=20
  circuit and even use another VFO (the DDS is used in the first VLF=20
  experiments). It is running on batteries and i just opened the windows =
to the=20
  shack so there may be a little drift.<BR>I'm back with -3 dB f.s. and =
its=20
  frozen outside! :-)<BR>This is the last pair (4 pcs.) of FETs and i =
will go=20
  back to the IRFP460 then. However i found there is also a <A=20
  =
href=3D"http://dl.dropbox.com/u/19882028/Datenbl%C3%A4tter/irfp460a.pdf">=
IRFP460A</A>=20
  which looks a bit more suitable for such critical switch mode =
applications.=20
  I've already ordered 20 pcs of them ;-) The FETs i'm using right now =
have rise=20
  and fall times below 10 ns which may be even worse in this =
application. But=20
  maybe the actual reason why they blow up is a completely different. =
Thus i=20
  will test the DDS now (no phase glitches)...<BR><BR>If someone wants =
to report=20
  about the signal, it is welcome :-)<BR><BR>73,=20
Stefan/DK7FC<BR><BR><BR></BLOCKQUOTE></BODY></HTML>

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