[TowerTalk] add a 3rd el to 40-2cd

[john at kk9a.com]

The low-Q loading coils probably contribute to the 250KHz SWR bandwidth
that K7LXC posted.

John

From:	"Jim Thomson" <jim.thom at telus.net>
Date:	Tue, 13 Mar 2018 20:44:36 -0700


##  The main problem with the 402-CD is the loading coils.
http://www.qsl.net/ve6wz/intro.htm  scroll down til u see the info on the
XM-240.
http://www.qsl.net/ve6wz/CC_coil.html   12 gauge magnet wire, wound butt
tight,
 on a .75 inch solid fiberglass rod  is as useless as it gets for a
40m loading coil.  Q is through the floor..and coil losses are sky high.   No
wonder they end up with a 50 ohm input Z..with NO matching  device used.
The XM-240 is a direct fed  2 el  40m shortened yagi.   When was the last
time
you saw a 2 el yagi that did not have a way less than  50 ohm input Z ?
The coil losses are sky high on the inferior  designed coils, such that the
real feedpoint Z  plus coil losses = 50 ohms..... = fubar.