Date: Tue, 22 Sep 2020 10:04:36 -0700
From: Jim Brown <jim@audiosystemsgroup.com>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] EFHW core
On 9/21/2020 5:11 PM, Ignacy Misztal wrote:
> It s hard to be smart here without tons of experimentation.
<Huh? How about studying the fundamentals? The ARRL Handbook and ARRL
<Antenna Book are great places to do that. NEC modeling is a great
<learning tool for antennas, and SimSmith is great for studying
<transmission lines and matching networks. There are several tutorials on
<my website that cover ferrites and common mode chokes. Jerry Sevick
<published a lot of great work on transformers using ferrite cores.
<73, Jim K9YC
## Cut the poor guy some slack.
That EFHW ant that Danny Horvat makes is pretty damned good.
Covers 8 bands, 75-40-30-20-17-15-12-10 No tuner required.
Uses 3 big cores. Good for 2 kw icas. Unique design.
https://myantennas.com/wp/product/efhw-7510-2k-plus/
## Joe ham would be doing one heck of a lot of experimenting, and
several renditions, and still not pull this engineering feat off.
## Here is the other engineering feat, 160-80-60-40 no tuner required.
https://myantennas.com/wp/product/mef-107-2k-plus-2/
Jim VE7RF
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