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From: Roger Lapthorn <rogerlapthorn@gmail.com>
Date: Fri, 20 Oct 2017 16:00:05 +0100
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Fwd: efficiency of long wave transmitters
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Nearly as tall as mine then ;-)

On 20 October 2017 at 15:03, Ian Marsh <ian.g4exd@gmail.com> wrote:

> I'm told that the Anthorn Tx runs 50 KW RF output to a 'T' antenna with a
> radiated power of 17 KW. Unfortunately, I'm not sure of the height of the
> supporting antenna masts but Wikipedia says that they are 227 metres (745
> ft) tall.
>
> Hope that helps.
>
> Ian G4EXD
>
> On 18/10/2017 16:10, John Rabson wrote:
>
> Can anyone help David Gibson?
>
> John F5VLF
> -------- Forwarded Message --------
> Subject: efficiency of long wave transmitters
> Date: Wed, 18 Oct 2017 13:54:36 +0100
> From: David Gibson <david@caves.org.uk> <david@caves.org.uk>
> To: Mike Bedford <bedfordmd@aol.com> <bedfordmd@aol.com>, Rob Gill
> <creg-editor@bcra.org.uk> <creg-editor@bcra.org.uk>,
> creg-enquiries@bcra.org.uk, C.Trayner@leeds.ac.uk
>
> Mike, Rob, John, Chris...
>
> This is me just being lazy and trying to avoid doing a web search, or
> ploughing through Watt's book on VLF Engineering.  Do any of you have a
> reference to a *definitive* statement of the transmitter efficiency of
> the 60kHz Anthorn transmitter and the 198kHz BBC R4 Droitwich transmitter?
>
> --
> David Gibson
>
>
>
>

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<div dir=3D"ltr">Nearly as tall as mine then ;-)</div><div class=3D"gmail_e=
xtra"><br><div class=3D"gmail_quote">On 20 October 2017 at 15:03, Ian Marsh=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:ian.g4exd@gmail.com" target=3D"_bl=
ank">ian.g4exd@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF">
    I&#39;m told that the Anthorn Tx runs 50 KW RF output to a &#39;T&#39; =
antenna
    with a radiated power of 17 KW. Unfortunately, I&#39;m not sure of the
    height of the supporting antenna masts but Wikipedia says that they
    are 227 metres (745 ft) tall.<br>
    <br>
    Hope that helps.<br>
    <br>
    Ian G4EXD <br><div><div class=3D"h5">
    <br>
    <div class=3D"m_973961189784133131moz-cite-prefix">On 18/10/2017 16:10,=
 John Rabson wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <p>Can anyone help David Gibson?</p>
      <p>John F5VLF<br>
      </p>
      <div class=3D"m_973961189784133131moz-forward-container">-------- For=
warded Message
        --------
        <table class=3D"m_973961189784133131moz-email-headers-table" border=
=3D"0" cellspacing=3D"0" cellpadding=3D"0">
          <tbody>
            <tr>
              <th align=3D"RIGHT" nowrap valign=3D"BASELINE">Subject:
              </th>
              <td>efficiency of long wave transmitters</td>
            </tr>
            <tr>
              <th align=3D"RIGHT" nowrap valign=3D"BASELINE">Date:
              </th>
              <td>Wed, 18 Oct 2017 13:54:36 +0100</td>
            </tr>
            <tr>
              <th align=3D"RIGHT" nowrap valign=3D"BASELINE">From:
              </th>
              <td>David Gibson <a class=3D"m_973961189784133131moz-txt-link=
-rfc2396E" href=3D"mailto:david@caves.org.uk" target=3D"_blank">&lt;david@c=
aves.org.uk&gt;</a></td>
            </tr>
            <tr>
              <th align=3D"RIGHT" nowrap valign=3D"BASELINE">To: </th>
              <td>Mike Bedford <a class=3D"m_973961189784133131moz-txt-link=
-rfc2396E" href=3D"mailto:bedfordmd@aol.com" target=3D"_blank">&lt;bedfordm=
d@aol.com&gt;</a>,
                Rob Gill <a class=3D"m_973961189784133131moz-txt-link-rfc23=
96E" href=3D"mailto:creg-editor@bcra.org.uk" target=3D"_blank">&lt;creg-edi=
tor@bcra.org.uk&gt;</a>,
                <a class=3D"m_973961189784133131moz-txt-link-abbreviated" h=
ref=3D"mailto:creg-enquiries@bcra.org.uk" target=3D"_blank">creg-enquiries@=
bcra.org.uk</a>,
                <a class=3D"m_973961189784133131moz-txt-link-abbreviated" h=
ref=3D"mailto:C.Trayner@leeds.ac.uk" target=3D"_blank">C.Trayner@leeds.ac.u=
k</a></td>
            </tr>
          </tbody>
        </table>
        <br>
        <br>
        <pre>Mike, Rob, John, Chris...

This is me just being lazy and trying to avoid doing a web search, or
ploughing through Watt&#39;s book on VLF Engineering.  Do any of you have a
reference to a *definitive* statement of the transmitter efficiency of
the 60kHz Anthorn transmitter and the 198kHz BBC R4 Droitwich transmitter?

--=20
David Gibson

</pre>
      </div>
    </blockquote>
    <br>
  </div></div></div>

</blockquote></div><br></div>

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