[RFI] Choke questions

[EDWARDS, EDDIE J]

Andy, 

Use coaxial cable when making RF chokes for antenna systems.  Use THHN (#12 stranded) when making an RF choke for AC power cabling--you can twist the wires making it twisted cable.  You can use solid, but it makes it a real chore. 

Jim Brown's (K9YC) pages have terrific info on chokes and how to make them.  

73, de ed -K0iL

-----Original Message-----
From: RFI <rfi-bounces+eedwards=oppd.com at contesting.com> On Behalf Of Andy KU7T
Sent: Tuesday, January 21, 2020 9:28 AM
To: rfi at contesting.com
Subject: [RFI] Choke questions

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Hi,
these may dumb questions (I am a choke newbee, but working myself up to the skillset to build my own to specific needs)...

A recommended method and material to use is #31 and a #12 THHN pair of wire (non-twisted). Since these are un-shielded wires, wouldn't this cause additional RF exposed where we do not need it?  Or does the field cancel because of the closeness of the pair of wires?

I would also have the opportunity to use thinner coax of the right impedance to make a choke. Why is the THHN wire better than coax?

Thanks and 73
Andy
KU7T
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