To: rsgb_lf_group@blacksheep.org
References: <a148ca55-801c-49fc-6142-e08e12d9c2eb@caves.org.uk>
 <f3cecdf8-5751-e39a-9b49-2564113989c3@gmail.com>
From: Ian Marsh <ian.g4exd@gmail.com>
Message-ID: <50fb2ef9-1067-a98e-ad97-502072300286@gmail.com>
Date: Fri, 20 Oct 2017 15:03:29 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <f3cecdf8-5751-e39a-9b49-2564113989c3@gmail.com>
Content-Language: en-GB
Subject: Re: LF: Fwd: efficiency of long wave transmitters
Content-Type: multipart/alternative;
 boundary="------------53218370FB22FADF8AB56DEF"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

This is a multi-part message in MIME format.
--------------53218370FB22FADF8AB56DEF
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit

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>
> To: 	Mike Bedford <bedfordmd@aol.com>, Rob Gill 
> <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
>


--------------53218370FB22FADF8AB56DEF
Content-Type: text/html; charset=windows-1252
Content-Transfer-Encoding: 7bit

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;
      charset=windows-1252">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    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.<br>
    <br>
    Hope that helps.<br>
    <br>
    Ian G4EXD <br>
    <br>
    <div class="moz-cite-prefix">On 18/10/2017 16:10, John Rabson wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:f3cecdf8-5751-e39a-9b49-2564113989c3@gmail.com">
      <meta http-equiv="content-type" content="text/html;
        charset=windows-1252">
      <p>Can anyone help David Gibson?</p>
      <p>John F5VLF<br>
      </p>
      <div class="moz-forward-container">-------- Forwarded Message
        --------
        <table class="moz-email-headers-table" cellspacing="0"
          cellpadding="0" border="0">
          <tbody>
            <tr>
              <th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
              </th>
              <td>efficiency of long wave transmitters</td>
            </tr>
            <tr>
              <th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date:
              </th>
              <td>Wed, 18 Oct 2017 13:54:36 +0100</td>
            </tr>
            <tr>
              <th nowrap="nowrap" valign="BASELINE" align="RIGHT">From:
              </th>
              <td>David Gibson <a class="moz-txt-link-rfc2396E"
                  href="mailto:david@caves.org.uk"
                  moz-do-not-send="true">&lt;david@caves.org.uk&gt;</a></td>
            </tr>
            <tr>
              <th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
              <td>Mike Bedford <a class="moz-txt-link-rfc2396E"
                  href="mailto:bedfordmd@aol.com" moz-do-not-send="true">&lt;bedfordmd@aol.com&gt;</a>,
                Rob Gill <a class="moz-txt-link-rfc2396E"
                  href="mailto:creg-editor@bcra.org.uk"
                  moz-do-not-send="true">&lt;creg-editor@bcra.org.uk&gt;</a>,
                <a class="moz-txt-link-abbreviated"
                  href="mailto:creg-enquiries@bcra.org.uk"
                  moz-do-not-send="true">creg-enquiries@bcra.org.uk</a>,
                <a class="moz-txt-link-abbreviated"
                  href="mailto:C.Trayner@leeds.ac.uk"
                  moz-do-not-send="true">C.Trayner@leeds.ac.uk</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'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

</pre>
      </div>
    </blockquote>
    <br>
  </body>
</html>

--------------53218370FB22FADF8AB56DEF--