Saturday, April 1, 2017

Random Wire Antenna Lengths. Post #1088.

Random Wire Antenna Lengths
(http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=30714).
Author:  www.dxzone.com.
Please click link or enter title URL into your browser search box to read the full article.

Comment:

A properly designed random wire antenna used in conjunction with a good ground radial or counterpoise system and a wide-range "tuner" can make an excellent HF multiband antenna for portable or emergency use.

In this well-written article, we learn how to choose the optimal lengths for multiband operation.  The author supplies several helpful programs to get you started as well as excellent graphic presentations of the lengths you should avoid.

The basic guidelines are simple:

Make your random wire antenna at least 1/4 wavelength for each band you plan to use.

Be sure to complete the antenna system with a ground radial or counterpoise system.

Be prepared to use a wide-range antenna '"tuner" if you want multiband capability.  The antenna "tuners" built into many current transceivers will be unable to handle the high SWR encountered on lengths approaching a 1/2 wavelength.

Another alternative to the random wire antenna is the W3EDP antenna described in the March 1936 edition of "QST" (page 36). You can google "W3EDP antenna" and find several articles (including one from this blog) discussing this antenna.

For more articles on random wire antennas, please check out these websites:

http://www.arrl.org/random-wires.
http://www.aa5tb.com/efha.html.

For the latest Amateur Radio news and information, please visit these websites:

http://www.HawaiiARRL.info.
https://oahuarrlnews.wordpress.com.
https://bigislandarrlnews.wordpress.com.
http://www.kh6jrm.info (breaking news for radio amateurs).

Other sites of interest:

http://hawaiisciencedigest.com (science and technology news for radio amateurs).
https://hawaiiintelligencedigest.com (trends in geopolitical intelligence, strategic forecasting, terrorism, and cybersecurity).

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM)