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Date: Sun, 21 Dec 2014 12:52:42 -0500
From: "stan, W1LE" <stanw1le@verizon.net>
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Subject: Re: LF: Low pass filter 1 kW 136k 472 k what components to choose?
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Wie Gehts,

Here is one suggestion:

http://www.w1vd.com/LPF.html

Stan, W1LE    Cape Cod   FN41sr

On 21-Dec-14 10:38 AM, Hans-Albrecht Haffa wrote:
> Dear OMs,
> just a question strait forward: What componnets I should choose for a 
> low pass filter for 136 kHz and 472 kHz, two filters to be designed.
> *136 kHz:  Pin abt 1,5 kW*
> *472 kHz:  Pin abt 0,5 kW*
> SWR: s = 1...2,5 when mated, in case of failure more
> a five-pole low pass will probably be sufficient.
> My Question:
> What iron powder cores or air coiles will do it, known or proofed by 
> experiment? Diameter, marterial grade?
> What capacitors? max. Voltage.  High voltage caps from Wima (Ucd=4kV 
> or 8 kV) are not available at distributors, mica capacitors will 
> hardly fit in capacitiy value or in voltage, when in my collection.
> The calculus of magnetic circuits is not a problem for me, but it is 
> easier to start with components that will fulfill the demands.
> Waiting to Your kind anwer,
> 55, Hans-Albrecht
> DK 8 ND


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    <div class="moz-cite-prefix">Wie Gehts,<br>
      <br>
      Here is one suggestion:<br>
      <br>
      <a class="moz-txt-link-freetext" href="http://www.w1vd.com/LPF.html">http://www.w1vd.com/LPF.html</a><br>
      <br>
      Stan, W1LE    Cape Cod   FN41sr<br>
      <br>
      On 21-Dec-14 10:38 AM, Hans-Albrecht Haffa wrote:<br>
    </div>
    <blockquote
cite="mid:trinity-556fad02-3094-4f80-bf75-359f1369c235-1419176296049@3capp-webde-bs34"
      type="cite">
      <div style="font-family: Verdana;font-size: 12.0px;">
        <div>Dear OMs,<br>
          just a question strait forward: What componnets I should
          choose for a low pass filter for 136 kHz and 472 kHz, two
          filters to be designed.</div>
        <div><strong>136 kHz:  Pin abt 1,5 kW</strong></div>
        <div><strong>472 kHz:  Pin abt 0,5 kW</strong></div>
        <div>SWR: s = 1...2,5 when mated, in case of failure more</div>
        <div>a five-pole low pass will probably be sufficient.</div>
        <div>My Question:</div>
        <div>What iron powder cores or air coiles will do it, known or
          proofed by experiment? Diameter, marterial grade?</div>
        <div>What capacitors? max. Voltage.  High voltage caps from Wima
          (Ucd=4kV or 8 kV) are not available at distributors, mica
          capacitors will hardly fit in capacitiy value or in voltage,
          when in my collection.</div>
        <div>The calculus of magnetic circuits is not a problem for me,
          but it is easier to start with components that will fulfill
          the demands.</div>
        <div>Waiting to Your kind anwer,</div>
        <div>55, Hans-Albrecht</div>
        <div>DK 8 ND</div>
      </div>
    </blockquote>
    <br>
  </body>
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