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Re: [TowerTalk] Choking on chokes

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Choking on chokes
From: Steve Hunt <steve@karinya.net>
Date: Wed, 03 Dec 2014 20:45:35 +0000
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
The level of CM current on a transmission line is *not* directly related to how well it is matched. You can have a badly mismatched line with no CM current, and you can have a perfectly-matched line with lots of CM current.

If what you say is true, you would not need a CM choke when feeding a 50 Ohm balanced antenna with 50 Ohm coax.

Steve G3TXQ



On 03/12/2014 20:21, Earl Morse wrote:
If you have an antenna that is well matched to the feed line then the CM 
currents are going to be minimal.  However, that match is frequency dependent 
so while you may have minimal CM currents on the feedline at the resonant point 
of the antenna they will change as you move away from resonance and the antenna 
impedance is no longer matched perfectly to the feedline.

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