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Re: [TowerTalk] RG-304 for CMC ?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] RG-304 for CMC ?
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sun, 24 Apr 2016 17:08:33 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Sun,4/24/2016 2:14 PM, Roger (K8RI) on TT wrote:
What's the difference between using LMR-400, or BuryFlex with six 12" dia Loops equally spaced, compared to bundling the same size loops into a single bunch or for that matter, grouping any coax together rather than equally spaced loops? It'd lower the resonant frequency,

Right.

but other than that (and looking neater), what about the choke's characteristics? Would it narrow the range of high impedance? Lower, raise, or leave the maximum impedance unaffected?

In general, the peak value of Z increases as the resonance moves down, but primarily because L and Rs are multiplied by N squared. Bunching the turns together mostly changes C, which is mostly the C between turns. That moves Fr down, but has little if any effect on the peak value of Z.

73, Jim K9YC
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