Message-ID: <000f01cd3f57$649df2f0$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <8BE4322932454ABBAF36917E7F0B7293@uwePC> <CAMFjj70+gM-ukas=NGMLyYwpL_wKnr-Mx3B6JH23XTr7yk_k9A@mail.gmail.com> <4FC74C16.1050905@iup.uni-heidelberg.de> <034701cd3f1d$b69fa650$1502a8c0@Clemens04> <4FC7596E.4070806@iup.uni-heidelberg.de> <63351021B87046C482A1433665C54902@uwePC> <000d01cd3f47$8f89e7e0$0401a8c0@xphd97xgq27nyf>
Date: Thu, 31 May 2012 18:01:23 -0000
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Subject: LF: Re: Re: Re: 475 kc Exiter /JUMA
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PS=20
G4JNT built a 700w LF rig out of junk and has published the info to this =
group. Difficult to justify the high cost of Kits that have to be built =
and produce only 60W.=20
g3kev

  ----- Original Message -----=20
  From: mal hamilton=20
  To: rsgb_lf_group@blacksheep.org=20
  Sent: Thursday, May 31, 2012 4:08 PM
  Subject: LF: Re: Re: 475 kc Exiter /JUMA


  Uwe
  I could build the same specification 60w rig for NO cost out of my =
junk box hi. The rig seems expensive for a kit and only 60 watts
  The Ropex 130 w rig for 136 Khz was less than =A3200 new and already =
built, even that was expensive. I built a 1Kw rig for almost nothing out =
of my junk box and still have after many years.
  I also have a couple of MF marine transmitters suitable for 500 lying =
in my garage !!
  de mal/g3kev

    ----- Original Message -----=20
    From: Uwe Wensauer=20
    To: rsgb_lf_group@blacksheep.org=20
    Sent: Thursday, May 31, 2012 3:10 PM
    Subject: LF: Re: 475 kc Exiter /JUMA


    Hi,
    here is the  bill for my new JUMA TX500

    Subtotal: 299.00=80
    Postage & Packaging: 26.00=80
    Tax: 68.77=80
    Grand Total: 393.77=80

    I=B4s by the way the 3rd kit I am building ( all bevore where built =
for others ..) but thats for my self ..

    Uwe DK1KQ



    From: Stefan Sch=E4fer=20
    Sent: Thursday, May 31, 2012 1:43 PM
    To: rsgb_lf_group@blacksheep.org=20
    Subject: Re: LF: 475 kc Exiter /JUMA

    Hi Clemens,=20

    Oh, OK. But anyway it was a very good hint to mention the JUMA 500 =
TX since it leads me to the CMCD design and this paper which nicely =
describes the problem of the VMCD desgin which i am trying in my first =
tests.
    The output C of the FETs is the problem. Since i want to have a =
relatively high power (100W) at 12V DC, the primary impedance is very =
low. So i have to use FETs with a very low on-resistance, ideally as low =
as possible of course. To find them is no problem (e.g. IRFP4368), but =
the output C is much to high then. I tried a IRZF48N (2 of them of =
course) as a compromise between RDSon and Cout but am just getting 60% =
efficiency at 70W in the first attempt. That's not acceptable for a /p =
PA that has to stay compact, i.e. without a big heat sink and/or a =
fan...

    The basics are well explained in this paper, makes fun to read :-)

    73, Stefan/DK7FC

    Am 31.05.2012 13:08, schrieb Clemens Paul:=20
        It costs 300 Euro which is not to much.=20


      Unfortunately you have to add 23%VAT tax within EU and shipping =
costs=20
      which I estimate to 30-40 Euro.=20
      So we end up somewhere around 400 Euro.=20
      Interesting kit,though.=20

      73=20
      Clemens=20
      DL4RAJ=20




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</HEAD>
<BODY dir=3Dltr text=3D#000000 bgColor=3D#ffffff>
<DIV><FONT face=3DArial>PS </FONT></DIV>
<DIV><FONT face=3DArial>G4JNT built a 700w LF rig out of junk and has =
published=20
the info to this group. Difficult to justify the high cost of Kits that =
have to=20
be built and produce only 60W. </FONT></DIV>
<DIV><FONT face=3DArial>g3kev</FONT></DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr=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=3Dg3kevmal@talktalk.net =
href=3D"mailto:g3kevmal@talktalk.net">mal=20
  hamilton</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> Thursday, May 31, 2012 =
4:08=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: Re: Re: 475 kc =
Exiter=20
  /JUMA</DIV>
  <DIV><BR></DIV>
  <DIV><FONT face=3DArial>Uwe</FONT></DIV>
  <DIV><FONT face=3DArial>I could build the same specification 60w rig =
for NO cost=20
  out of my junk box hi. The rig seems expensive for a kit and only 60=20
  watts</FONT></DIV>
  <DIV><FONT face=3DArial>The Ropex 130 w rig for 136 Khz was less =
than&nbsp;=A3200=20
  new and already built, even that was expensive. I built a 1Kw rig for =
almost=20
  nothing&nbsp;out of my junk box and still have after many =
years.</FONT></DIV>
  <DIV><FONT face=3DArial>I also have a couple of MF&nbsp;marine =
transmitters=20
  suitable for 500 lying in my garage !!</FONT></DIV>
  <DIV><FONT face=3DArial>de mal/g3kev</FONT></DIV>
  <DIV>&nbsp;</DIV>
  <BLOCKQUOTE dir=3Dltr=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=3Duwe.wensauer@gmx.de =
href=3D"mailto:uwe.wensauer@gmx.de">Uwe=20
    Wensauer</A> </DIV>
    <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
    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> Thursday, May 31, 2012 =
3:10=20
    PM</DIV>
    <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: Re: 475 kc =
Exiter=20
    /JUMA</DIV>
    <DIV><BR></DIV>
    <DIV dir=3Dltr>
    <DIV style=3D"FONT-SIZE: 12pt; COLOR: #000000; FONT-FAMILY: =
'Calibri'">
    <DIV>Hi,</DIV>
    <DIV>here is the&nbsp; bill for my new JUMA TX500</DIV>
    <DIV>&nbsp;</DIV>
    <DIV><FONT face=3D"Times New Roman">Subtotal: 299.00=80<BR>Postage =
&amp;=20
    Packaging: 26.00=80<BR>Tax: 68.77=80<BR>Grand Total: =
393.77=80</FONT></DIV>
    <DIV><FONT face=3D"Times New Roman"></FONT>&nbsp;</DIV>
    <DIV><FONT face=3D"Times New Roman">I=B4s by the way the 3rd kit I =
am building (=20
    all bevore where built for others ..) but thats for my self =
..</FONT></DIV>
    <DIV><FONT face=3D"Times New Roman"></FONT>&nbsp;</DIV>
    <DIV><FONT face=3D"Times New Roman">Uwe DK1KQ</FONT></DIV>
    <DIV><BR></DIV>
    <DIV=20
    style=3D"DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: small; =
COLOR: #000000; FONT-STYLE: normal; FONT-FAMILY: 'Calibri'; =
TEXT-DECORATION: none">
    <DIV style=3D"FONT: 10pt tahoma">
    <DIV><FONT face=3DCalibri size=3D3></FONT>&nbsp;</DIV>
    <DIV style=3D"BACKGROUND: #f5f5f5">
    <DIV style=3D"font-color: black"><B>From:</B> <A=20
    title=3DStefan.Schaefer@iup.uni-heidelberg.de=20
    href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de">Stefan =
Sch=E4fer</A>=20
</DIV>
    <DIV><B>Sent:</B> Thursday, May 31, 2012 1:43 PM</DIV>
    <DIV><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><B>Subject:</B> Re: LF: 475 kc Exiter /JUMA</DIV></DIV></DIV>
    <DIV>&nbsp;</DIV></DIV>
    <DIV=20
    style=3D"DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: small; =
COLOR: #000000; FONT-STYLE: normal; FONT-FAMILY: 'Calibri'; =
TEXT-DECORATION: none">Hi=20
    Clemens, <BR><BR>Oh, OK. But anyway it was a very good hint to =
mention the=20
    JUMA 500 TX since it leads me to the CMCD design and this paper =
which nicely=20
    describes the problem of the VMCD desgin which i am trying in my =
first=20
    tests.<BR>The output C of the FETs is the problem. Since i want to =
have a=20
    relatively high power (100W) at 12V DC, the primary impedance is =
very low.=20
    So i have to use FETs with a very low on-resistance, ideally as low =
as=20
    possible of course. To find them is no problem (e.g. <A=20
    =
href=3D"http://dl.dropbox.com/u/19882028/Datenbl%C3%A4tter/IRFP4368PbF.pd=
f">IRFP4368</A>),=20
    but the output C is much to high then. I tried a IRZF48N (2 of them =
of=20
    course) as a compromise between RDSon and Cout but am just getting =
60%=20
    efficiency at 70W in the first attempt. That's not acceptable for a =
/p PA=20
    that has to stay compact, i.e. without a big heat sink and/or a=20
    fan...<BR><BR>The basics are well explained in this paper, makes fun =
to read=20
    :-)<BR><BR>73, Stefan/DK7FC<BR><BR>Am 31.05.2012 13:08, schrieb =
Clemens=20
    Paul:=20
    <BLOCKQUOTE cite=3Dmid:034701cd3f1d$b69fa650$1502a8c0@Clemens04 =
type=3D"cite">
      <BLOCKQUOTE type=3D"cite">It costs 300 Euro which is not to much.=20
      <BR></BLOCKQUOTE><BR>Unfortunately you have to add 23%VAT tax =
within EU=20
      and shipping costs <BR>which I estimate to 30-40 Euro. <BR>So we =
end up=20
      somewhere around 400 Euro. <BR>Interesting kit,though. <BR><BR>73=20
      <BR>Clemens <BR>DL4RAJ=20
<BR><BR><BR></BLOCKQUOTE></DIV></DIV></DIV></BLOCKQUOTE></BLOCKQUOTE></BO=
DY></HTML>

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