[TowerTalk] 80m loading coil for 18-HT

[Tim Duffy]

One other comment is that the original HyGain 80 CW mod (loading coil) that
MFJ sold - had its challenges.

Many times guys would catch the  80 meter mast insulator on fire at the top
of the tower section (24 ft.). when running high power in the CW section of
80 meters. Substituting Teflon for the PVC insulator fixed that issue

73
Tim K3LR 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Brown
Sent: Tuesday, May 20, 2025 3:01 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] 80m loading coil for 18-HT

On 5/20/2025 11:42 AM, n5xz at earthlink.net wrote:
> I'm looking to installed an 80m loading coil in my 18HT tower

If you can't find one, or info on one, you might want to try sweeping 
the antenna with a complex impedance analyzer (VIA) that can export a 
file to one of the versions of NEC, and design your own. The general 
approach would be to find the suitable inductance, then go to inductor 
design tools to come up with its physical design. SimSmith is also a 
useful tool for designing something like this.

73, Jim K9YC



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