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Date: Thu, 05 Mar 2009 15:31:29 +0100
From: henny van elst <cpm@planet.nl>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Re: capture 67hz.jpg
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T-Online eMail
  -Tu Markus and Ha-jo
  Henny pa3cpm
  best 73s



  ---- Original Message ----- 
  From: hajo.brandt.dj1zb@t-online.de 
  To: rsgb_lf_group@blacksheep.org 
  Sent: Thursday, March 05, 2009 1:11 AM
  Subject: Re: LF: Re: capture 67hz.jpg


    "Markus Vester" <markusvester@aol.com> schrieb: 
    Dear Henny,

    my QTH is about 400 m from a railway line, and I regularly saw their 16.667 Hz power frequency and several ELF harmonics. The E-fields are relatively strong as the lines normally do not carry a grounded top wire for lightning protection. The "modulation" could be caused by some switching activity.

    Another origin might be a controlled rectifier on the 50 Hz mains, which could be triggered at a subharmonic frequency.

    Best regards,
    Markus, DF6NM


    Dear Markus,

    I have even thougth that this "67Hz" in reality might have been 66.667 Hz, and this would open other ideas, such as mixer products between 50 Hz and 16,667 Hz etc.

    HW?

    73 Ha-Jo, DJ1ZB 


    ----- Original Message ----- 
      From: henny van elst 
      To: blacksheep 
      Sent: Wednesday, March 04, 2009 7:43 PM
      Subject: LF: capture 67hz.jpg


      Hi,Lf
      capture unid signal 67hz,but who ?
      henny pa3cpm
      best 73s
    


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 8.0.237 / Virus Database: 270.11.7/1983 - Release Date: 03/04/09 07:41:00

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<BLOCKQUOTE   style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style="FONT: 10pt arial">-Tu Markus and Ha-jo</DIV>
  <DIV style="FONT: 10pt arial">Henny pa3cpm</DIV>
  <DIV style="FONT: 10pt arial">best 73s</DIV>
  <DIV style="FONT: 10pt arial">&nbsp;</DIV>
  <DIV style="FONT: 10pt arial">&nbsp;</DIV>
  <DIV style="FONT: 10pt arial">&nbsp;</DIV>
  <DIV style="FONT: 10pt arial">---- Original Message ----- </DIV>
  <DIV     style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> 
  <A title=hajo.brandt.dj1zb@t-online.de     href="mailto:hajo.brandt.dj1zb@t-online.de">hajo.brandt.dj1zb@t-online.de</A> 
  </DIV>
  <DIV style="FONT: 10pt arial"><B>To:</B> <A title=rsgb_lf_group@blacksheep.org     href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A> 
  </DIV>
  <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 05, 2009 1:11 
  AM</DIV>
  <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: LF: Re: capture 
  67hz.jpg</DIV>
  <DIV><BR></DIV><FONT face=Arial color=#000000 size=3>&nbsp;</FONT> "Markus 
  Vester" &lt;<A href="mailto:markusvester@aol.com">markusvester@aol.com</A>&gt; 
  schrieb: 
  <BLOCKQUOTE     style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV><FONT face=Arial size=2>Dear Henny,</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
    <DIV><FONT face=Arial size=2>my QTH is about 400 m from&nbsp;a railway line, 
    and&nbsp;I regularly&nbsp;saw their 16.667 Hz power frequency and several 
    ELF harmonics. The E-fields are relatively strong as the lines normally do 
    not carry a grounded&nbsp;top wire&nbsp;for </FONT><FONT face=Arial       size=2>lightning protection. The "modulation" could be caused by&nbsp;some 
    switching activity.</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
    <DIV><FONT face=Arial size=2>Another origin might&nbsp;be a 
    controlled&nbsp;rectifier on the 50 Hz mains, which could&nbsp;be triggered 
    at&nbsp;a subharmonic frequency.</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
    <DIV><FONT face=Arial size=2>Best regards,</FONT></DIV>
    <DIV><FONT face=Arial size=2>Markus, DF6NM</FONT></DIV>
    <DIV><FONT face=Arial size=2><BR><BR>Dear Markus,<BR><BR>I have even thougth 
    that this "67Hz" in reality might have been 66.667 Hz, and this would open 
    other ideas, such as mixer products between 50 Hz and 16,667 Hz 
    etc.<BR><BR>HW?<BR><BR>73 Ha-Jo, DJ1ZB&nbsp;<BR><BR></FONT></DIV>
    <DIV>----- Original Message ----- </DIV>
    <BLOCKQUOTE       style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
      <DIV         style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> 
      <A title=cpm@planet.nl href="mailto:cpm@planet.nl">henny van elst</A> 
      </DIV>
      <DIV style="FONT: 10pt arial"><B>To:</B> <A         title=rsgb_lf_group@blacksheep.org         href="mailto:rsgb_lf_group@blacksheep.org">blacksheep</A> </DIV>
      <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 04, 2009 7:43 
      PM</DIV>
      <DIV style="FONT: 10pt arial"><B>Subject:</B> LF: capture 67hz.jpg</DIV>
      <DIV><BR></DIV>
      <DIV><FONT face=Arial size=2>Hi,Lf</FONT></DIV>
      <DIV><FONT face=Arial size=2>capture unid signal 67hz,but who 
      ?</FONT></DIV>
      <DIV><FONT face=Arial size=2>henny pa3cpm</FONT></DIV>
      <DIV><FONT face=Arial size=2>best 
  73s</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE><FONT face=Arial color=#000000     size=3>&nbsp;</FONT> 
  <DIV></DIV>
  <P>
  <HR>

  <P></P><BR>No virus found in this incoming message.<BR>Checked by AVG - 
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  Date: 03/04/09 07:41:00<BR></BLOCKQUOTE></BODY></HTML>

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