Thursday, January 19, 2017

Simple Ham Radio Antennas--40m mini portable End Fed Half Wave Tuner. Post #1017.

40m portable End Fed Half Wave Tuner
Author:  VK5ZVS.
Accessed on 20 January 2017, 05:55 hrs, UTC.
Please click title link or insert title URL to read the article.


One of the most popular HF antennas for portable or emergency use is the EFHW (end fed half wave).  The antenna is cheap, easy to make, and can be stored easily in your home or vehicle.  However, one of the drawbacks to the EFHW is the rather large SWR presented to our amateur radio transceivers which usually have a nominal impedance of 50 ohms.

The impedance issue can be mitigated with a simple antenna transmatch (i.e. "tuner").  In this post, VK5ZVS shows us how to make an inexpensive "tuner" from commonly available parts.  The heart of the device is a tapped coil (31 turns) wrapped around a T200-6 core and a 56pF capacitor.  VK5ZVS provides helpful photographs and a simple schematic diagram of his "tuner."  This would make an excellent addition to your "Go-Kit" or other portable gear.

For the latest Amateur Radio news and information, please visit these sites: (breaking news for radio amateurs). (latest science and technology news for radio amateurs).

Be sure to check the blog sidebars for more antenna and propagation articles.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM)

No comments:

Post a Comment

Thank you for visiting my Amateur Radio Blog. I value your comments and suggestions. For Amateur Radio Antenna Topics and Discussions, stay here. For Amateur Radio News and Trends, please visit my news site at
Aloha es 73 de Russ (KH6JRM).