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Re: LF: Low pass filter 1 kW 136k 472 k what components to choose?

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Subject: Re: LF: Low pass filter 1 kW 136k 472 k what components to choose?
From: DK7FC <[email protected]>
Date: Sun, 21 Dec 2014 23:00:16 +0100
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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
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