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Re: [Amps] Broadband transformers, and ferrite plate chokes

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Subject: Re: [Amps] Broadband transformers, and ferrite plate chokes
From: "Peter Voelpel" <>
Date: Sun, 9 Mar 2008 03:43:46 +0100
List-post: <">>
Those mentioned R&S transmitting  chokes (90µH) use 25 windings on a 2 1/4"
ceramic former containing a 1.5" diameter ferrit rod 3.5" long. The wire is
#18 spacewound at 5 tpi.
Original use in 1-30MHz amps running at 3KV anode voltage, 1.3A at full
Two chokes are used at right angles and one is switched out above 10MHz.
The remaining one is tapped then at 60µH as well.

I am going to use the same pair of chokes for a 2x8877 project I am busy


-----Original Message-----
From: [] On
Behalf Of Manfred Mornhinweg

In order to keep a ferrite core of 2cm diameter working at low enough
losses, about 100 turns of wire would be needed for a typical amp running at
2.5kV RMS RF voltage. 

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