From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <549742F0.1000603@gmail.com>
Date: Sun, 21 Dec 2014 23:00:16 +0100
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <trinity-556fad02-3094-4f80-bf75-359f1369c235-1419176296049@3capp-webde-bs34>
In-Reply-To: <trinity-556fad02-3094-4f80-bf75-359f1369c235-1419176296049@3capp-webde-bs34>
Subject: Re: LF: Low pass filter 1 kW 136k 472 k what components to choose?
Content-Type: multipart/alternative;
 boundary="------------070703020605000201010502"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

This is a multi-part message in MIME format.
--------------070703020605000201010502
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Hi Hans,

T200-2. They may need a small fan on LF if you want to run e.g. WSPR-15 
but for CW/QRSS it will work without one.

73, Stefan

PS: I know it.

Am 21.12.2014 16:38, schrieb Hans-Albrecht Haffa:
> 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

--------------070703020605000201010502
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Hans, <br>
<br>
T200-2. They may need a small fan on LF if you want to run e.g. WSPR-15
but for CW/QRSS it will work without one.<br>
<br>
73, Stefan<br>
<br>
PS: I know it.<br>
<br>
Am 21.12.2014 16:38, schrieb Hans-Albrecht Haffa:
<blockquote
 cite="mid:trinity-556fad02-3094-4f80-bf75-359f1369c235-1419176296049@3capp-webde-bs34"
 type="cite">
  <div style="font-family: Verdana; font-size: 12px;">
  <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>
</body>
</html>

--------------070703020605000201010502--