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Topband: Common mode choke 160m inverted L

Subject: Topband: Common mode choke 160m inverted L
From: ON4GPE <>
Date: Sat, 23 Dec 2017 19:27:41 +0100
List-post: <>
Hi All,

I would like to build a good high power common mode choke for 160m.
I have a piece of RG393/U ptfe 10mm coax. (1 meter)
I was thinking of using this and make me a "W2DU style" choke.
Searching for the ferrite cable cores, i found on the Mouser website 2 types which would fit:

Fair-rite 31 material :
Laird  LF material :

Laird got a higher impedance at 1.8 Mhz.

I think a lot of ham's on this topband reflector got more experience, so what's your advice ?

Thanks, Gert  ON4GPE
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