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Message-ID: <E5F211E736844100AC5BCE6727D62B07@White>
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
References: <KHEKJCEODMJLNEDPDFDGAEDICDAA.victor13@online.nl>
Date: Fri, 25 Oct 2013 10:22:16 +0200
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Subject: Re: LF: RE: Diplexer 137 / 74 kHz
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Hi Victor,

+232 dB sounds impressive doesn't it ;-)

In reality the level difference is not so large. DCF77 comes in around 8 =
mV/m at 160 km distance, inducing an unloaded voltage of 8 mV on my =
antenna. Transforming from 17 ohms and loading would make that 7 mV at =
50 ohms (-30 dBm, S9+43). The best signals from CFH were around 40 dB =
less than DCF77.=20

My LF transmitter was delivering about 55 dBm ("S9+128 dB"), and the =
level difference to CFH is "only" around 125 dB.

Best 73,
Markus (DF6NM)



From: victor13@online.nl=20
Sent: Friday, October 25, 2013 6:09 AM
To: rsgb_lf_group@blacksheep.org=20
Subject: LF: RE: Diplexer 137 / 74 kHz


Very nice job Marcus,21 KV is S9+232dB!

73
Victor
  -----Oorspronkelijk bericht-----
  Van: owner-rsgb_lf_group@blacksheep.org =
[mailto:owner-rsgb_lf_group@blacksheep.org]Namens Markus Vester
  Verzonden: vrijdag 25 oktober 2013 2:47
  Aan: rsgb_lf_group@blacksheep.org
  Onderwerp: LF: Diplexer 137 / 74 kHz


  This thing amazes me:=20

  As noted a while ago, I have connected a makeshift diplexer with the =
LF transmitter and receiver on one port, and an additional 74.55 kHz =
receiver to the other. =20

  At the time of writing, I am transmitting on 137.62 kHz, about 300 W =
making 4.2 A and 21 kV at the antenna. Now on the other RX, I can still =
see DCF77 on 77.5 kHz, and even some of CFH 73.6 kHz from Canada, on the =
same antenna which is actually radiating! There is some RX overload =
reducing sensitivity by some 20 dB, but the both signals are still =
there, and not swamped by noise from the TX or partial discharges.

  There's a circuit and some pics in =
df6nm.bplaced.net/LF/74kHz/Diplexer/

  Best 73,
  Markus (DF6NM)

  PS1 Got a good "X" from Bob around 23 UT. Should better shut up and =
watch! http://dl.dropboxusercontent.com/u/26404526/df6nm_74kHz.jpg
  PS2 Just received a mail from Jay saying that he picked me up in =
WSPR-15. Should better go about transmitting again ;-)=20

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type =
content=3Dtext/html;charset=3Diso-8859-1>
<META content=3D"MSHTML 6.00.6000.21352" name=3DGENERATOR></HEAD>
<BODY id=3DMailContainerBody=20
style=3D"PADDING-RIGHT: 10px; PADDING-LEFT: 10px; PADDING-TOP: 15px"=20
bgColor=3D#ffffff leftMargin=3D0 topMargin=3D0 CanvasTabStop=3D"true"=20
name=3D"Compose message area">
<DIV><FONT face=3DArial size=3D2>Hi Victor,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>+232 dB sounds impressive doesn't it=20
;-)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>In reality the level difference is not =
so large.=20
DCF77&nbsp;comes in around 8 mV/m at 160 km distance, inducing an =
unloaded=20
voltage of 8 mV on my antenna. Transforming from 17 ohms and loading =
would make=20
that 7 mV&nbsp;at 50 ohms (-30 dBm, S9+43). The best signals from CFH =
were=20
around 40 dB less than DCF77. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>My LF transmitter&nbsp;was delivering =
about 55 dBm=20
("S9+128 dB"),&nbsp;and&nbsp;the level difference to CFH is "only" =
around 125=20
dB.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Best 73,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Markus (DF6NM)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><FONT =
face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dvictor13@online.nl=20
href=3D"mailto:victor13@online.nl">victor13@online.nl</A> </DIV>
<DIV><B>Sent:</B> Friday, October 25, 2013 6:09 AM</DIV>
<DIV><B>To:</B> <A=20
title=3D"mailto:rsgb_lf_group@blacksheep.org&#10;STRG + Klicken, um =
Verkn=FCpfung zu folgen"=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
</DIV>
<DIV><B>Subject:</B> LF: RE: Diplexer 137 / 74 kHz</DIV></DIV></DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
size=3D2></FONT><FONT=20
face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT =
face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><BR></DIV>
<DIV><SPAN class=3D836590604-25102013><FONT face=3DArial color=3D#0000ff =
size=3D2>Very=20
nice job Marcus,21 KV is S9+232dB!</FONT></SPAN></DIV>
<DIV><SPAN class=3D836590604-25102013><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D836590604-25102013><FONT face=3DArial color=3D#0000ff =

size=3D2>73</FONT></SPAN></DIV>
<DIV><SPAN class=3D836590604-25102013><FONT face=3DArial color=3D#0000ff =

size=3D2>Victor</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Oorspronkelijk bericht-----<BR><B>Van:</B> <A=20
  =
href=3D"mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_group@bl=
acksheep.org</A>=20
  [mailto:owner-rsgb_lf_group@blacksheep.org]<B>Namens </B>Markus=20
  Vester<BR><B>Verzonden:</B> vrijdag 25 oktober 2013 =
2:47<BR><B>Aan:</B> <A=20
  =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A><BR><B>Onderwerp:</B>=20
  LF: Diplexer 137 / 74 kHz<BR><BR></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>This thing amazes me: </FONT></DIV>
  <DIV>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>As noted a while ago,&nbsp;I have =
connected a=20
  makeshift diplexer with the LF&nbsp;transmitter and receiver&nbsp;on =
one port,=20
  and an additional 74.55 kHz receiver to the =
other.&nbsp;&nbsp;</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>At the time of writing, I am =
transmitting on=20
  137.62 kHz, about 300 W making 4.2 A and 21 kV at the antenna. Now on =
the=20
  other RX, I can still see DCF77 on 77.5 kHz, and even some of CFH 73.6 =
kHz=20
  from Canada, <STRONG>on the same antenna</STRONG> which is actually=20
  radiating!&nbsp;There is some RX overload reducing sensitivity by some =
20 dB,=20
  but&nbsp;the both signals&nbsp;are still there, and not swamped by =
noise from=20
  the TX or partial discharges.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>There's a circuit and some pics =
in&nbsp;<A=20
  title=3D"http://df6nm.bplaced.net/LF/74kHz/Diplexer/&#10;STRG + =
Klicken, um Verkn=FCpfung zu folgen"=20
  =
href=3D"http://df6nm.bplaced.net/LF/74kHz/Diplexer/">df6nm.bplaced.net/LF=
/74kHz/Diplexer/</A></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>Best 73,</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>Markus (DF6NM)</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>PS1 Got&nbsp;a =
good&nbsp;"X"&nbsp;from Bob around=20
  23 UT. Should better shut up and watch! <A=20
  =
title=3D"http://dl.dropboxusercontent.com/u/26404526/df6nm_74kHz.jpg&#10;=
STRG + Klicken, um Verkn=FCpfung zu folgen"=20
  =
href=3D"http://dl.dropboxusercontent.com/u/26404526/df6nm_74kHz.jpg">http=
://dl.dropboxusercontent.com/u/26404526/df6nm_74kHz.jpg</A></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>PS2 Just received a mail from Jay =
saying that he=20
  picked me up&nbsp;in WSPR-15. Should better go about transmitting=20
  again&nbsp;;-)&nbsp;</FONT></DIV>
  <DIV><FONT face=3DArial =
size=3D2></FONT>&nbsp;</DIV></BLOCKQUOTE></BODY></HTML>

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