Return to KLUBNL.PL main page

[Top] [All Lists]

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

To: [email protected]
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
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=2fFUEKfOqe76s21Clq8Z7YWei75djfKh6kwdhnUFrDI=; b=K2+ti3U4CUSptH79I//J6LL1BCo6RjeNJhnF2BB2csXeNkKKZ/pIXbAHSnoXwGWSZZ bZk/CLzSVDYIUKRk/lPcuNicAIMgsTGlGkbIZ36GmVfJ3K+hFUcFcp2FnvP1wwJy7BLW 8zUD0tOocr6XPeXOzP7gFiJnA7PBdaKPlO84p3jdJ6ImVRaluRXU1sYMMn2Td3MAS+uz LVsXBTDUW9if2jcedTb8DMUqdMuyOjoHKni98ECz62FkNHGtA6mJSPEPJxwb+KkIKlOQ mUeU7yVy5V590Ewu7brt1n35DqG5KOxKWjDmWfI58sd/be4wVAE6biCGexiV799IVrJv VQ6g==
In-reply-to: <[email protected]-webde-bs34>
References: <[email protected]-webde-bs34>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv: Gecko/20100227 Thunderbird/3.0.3
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
<Prev in Thread] Current Thread [Next in Thread>