From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>,
        Hans-Albrecht Haffa <dk8nd@web.de>
Thread-Topic: Low pass filter 1 kW 136k 472 k what components to choose?
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Date: Sun, 21 Dec 2014 15:55:35 +0000
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Subject: LF: RE: Low pass filter 1 kW 136k 472 k what components to choose?
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Hello Hans Albrecht,


I do use T200-2 cores for 472kHz. At 600W output a single core gets lukewar=
m at good SWR but rather hot at SWR > 2. As I had a stock of T200-2's avail=
able I did glue 2 T200-2's, then I had no significant temperature rise unde=
r any conditions. Wire used was 2mm litz wire. The combination of 2 T200-2'=
s and 2mm litz wire resulted in a Q of 550!

As capacitors I do use 1.5kV polypropylene film capacitors (cost less that =
1 Euro).


73, Rik  ON7YD


________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org=
] namens Hans-Albrecht Haffa [dk8nd@web.de]
Verzonden: zondag 21 december 2014 16:38
Aan: Langwellen-Reflektor; Hans-Albrecht Haffa
Onderwerp: LF: Low pass filter 1 kW 136k 472 k what components to choose?

Dear OMs,
just a question strait forward: What componnets I should choose for a low p=
ass 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 =3D 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 experi=
ment? Diameter, marterial grade?
What capacitors? max. Voltage.  High voltage caps from Wima (Ucd=3D4kV 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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<p>Hello Hans Albrecht,</p>
<p>&nbsp;</p>
<p>I do use T200-2 cores for 472kHz. At 600W output&nbsp;a single core gets=
 lukewarm at good SWR but rather hot at SWR &gt; 2. As I had a stock of T20=
0-2's available I did glue 2 T200-2's, then I had no significant temperatur=
e rise under any conditions. Wire used was
 2mm litz wire. The combination of 2 T200-2's and 2mm litz wire resulted in=
 a Q of 550!</p>
<p>As capacitors I do use 1.5kV polypropylene film capacitors (cost less th=
at 1 Euro).</p>
<p>&nbsp;</p>
<p>73, Rik&nbsp; ON7YD</p>
<p>&nbsp;</p>
<div style=3D"FONT-SIZE: 16px; FONT-FAMILY: Times New Roman; COLOR: #000000=
">
<hr tabindex=3D"-1">
<div id=3D"divRpF499785" style=3D"DIRECTION: ltr"><font color=3D"#000000" s=
ize=3D"2" face=3D"Tahoma"><b>Van:</b> owner-rsgb_lf_group@blacksheep.org [o=
wner-rsgb_lf_group@blacksheep.org] namens Hans-Albrecht Haffa [dk8nd@web.de=
]<br>
<b>Verzonden:</b> zondag 21 december 2014 16:38<br>
<b>Aan:</b> Langwellen-Reflektor; Hans-Albrecht Haffa<br>
<b>Onderwerp:</b> LF: Low pass filter 1 kW 136k 472 k what components to ch=
oose?<br>
</font><br>
</div>
<div></div>
<div>
<div style=3D"FONT-SIZE: 12px; FONT-FAMILY: Verdana">
<div>Dear OMs,<br>
just a question strait forward: What componnets I should choose for a low p=
ass filter for 136 kHz and 472 kHz, two filters to be designed.</div>
<div><strong>136 kHz:&nbsp; Pin abt 1,5 kW</strong></div>
<div><strong>472 kHz:&nbsp; Pin abt 0,5 kW</strong></div>
<div>SWR: s =3D 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 e=
xperiment? Diameter, marterial grade?</div>
<div>What capacitors? max. Voltage.&nbsp; High voltage caps from Wima (Ucd=
=3D4kV or 8 kV) are not available at distributors, mica capacitors will har=
dly 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 e=
asier 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>
</div>
</div>
</div>
</body>
</html>

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