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Re: [RFI] Maintaining 50 Ohms...

To: rfi@contesting.com
Subject: Re: [RFI] Maintaining 50 Ohms...
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sat, 18 Sep 2021 11:22:52 -0700
List-post: <mailto:rfi@contesting.com>
On 9/18/2021 4:35 AM, Dave wrote:
I will build a small chassis and put them on inside, with a pair of SO-239s.

I've deleted the original post in this thread. Did it start with a choke with the bleed included? Several thoughts. First, the first choke in any system should be at the antenna feedpoint, not in the shack. Second, for reasons of dissipation, chokes should not be enclosed, or if they are enclosed, must be provided with sufficient ventilation. There's an addition to the Cookbook from NA6O, who did some serious lab work on that, and added it to chokes for the N6RO contesting station.

Third, if chokes are inside a conductive box with connectors mounted to it, the box will short around the choke.

73, Jim K9YC
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