[TowerTalk] EFHW core

[Jim Thomson]

Date: Tue, 22 Sep 2020 10:04:36 -0700
From: Jim Brown <jim at audiosystemsgroup.com>
To: towertalk at 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