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Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils
From: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 28 Apr 2020 19:39:50 -0700
List-post: <mailto:towertalk@contesting.com>

The inductance of a linear loading wire goes up as the frequency increases.  It acts similarly to a transmission line.  You typically would like the inductance to go down (with increasing frequency), or worst case stay the same.

A coil's inductance doesn't significantly change with frequency, although of course it's reactance does.

73,
Dave   AB7E



On 4/28/2020 7:07 PM, john@kk9a.com wrote:
Can you elaborate on this?

John KK9A

-----Original Message-----
From: Richard (Rick) Karlquist [mailto:richard@karlquist.com]
Sent: Tuesday, April 28, 2020 4:55 PM
To: Mike & Becca Krzystyniak; john@kk9a.com; towertalk@contesting.com
Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils

<snip> Any linear loading scheme has
the drawback that the effective loading inductance is directly
proportional to frequency; exactly what you don't want.

Rick N6RK


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