Skip to main content

End Fed Long Wire. Post #1034.

End Fed Long Wire
(http://www.dxzone.com/cgi-bing/dir/jump2.cgi?ID=31710).
Accessed on 06 February 2017, 00:35 hrs, UTC.
Authors:  WB5CXC and W5WF (This presentation was offered at Ham Con 2013 in Plano, Texas).
Please click link or insert title URL into your browser search box to read the complete article and to access the full power point presentation.

Comment:

Here's another great, inexpensive, and simple antenna for those living in deed-restricted properties or active in portable/emergency operations.

In this article by WB5CXC and W5WR, we get a complete, step-by-step tutorial on how to build this antenna that covers all amateur radio bands between 40 and 6 meters.  According to WB5CXC, the antenna is an inexpensive, end fed antenna that measures 30 feet/9.146 meters, and can be used with wires as short as 17.5 feet/5.335 meters.  Of course, performance will improve with longer wire lengths--just be sure to avoid 1/2 wavelength or multiples of 1/2 wavelength on the frequency of your choice.  The article provides helpful photographs, suggested lengths, a full list of materials, and a few hints for successful operation.

The key to the antenna's success is a matching network consisting of a 1:9 UnUn trifilar wound transformer using a T 106-2 iron torroid coil. The coil matches the 50 ohm feed line to the high impedance of the end fed antenna. The antenna can handle 100 watts without problems.  Be sure to use an antenna transmatch ("tuner") to keep SWR at the lowest possible level.  The antenna support is a MFJ-1910 telescoping fiberglass mast that extends to 33 feet/10.06 meters.  The mast can be raised and lowered in less than 5 minutes.  This antenna would work well in HOA/CC&R situations where rapid deployment and lowering are a must.
----------------------------------------
For the latest Amateur Radio news and information, please visit these sites:

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 (latest 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)

Comments

Popular posts from this blog

G5RV Multi Band HF Dipole Antenna. Post #1555.

If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=aeNHIQ_j4Dk This well-produced and richly illustrated tutorial on the classic G5RV HF Dipole Antenna was presented to the Brandon Amateur Radio Society in Brandon, Florida in 2017 by Bernie Huth (W4BGH).  Bernie does an excellent job of  explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV).  Although Varney envisioned his design primarily as a 3/2 wavelength antenna for the 20 meter Amateur Radio band, radio amateurs have used the antenna for multiband use.  The G5RV is an excellent choice for the 20 meter band.  Performance on other HF Amateur Radio bands is good enough to qualify as stand alone HF antenna if you can only erect one HF antenna. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a wee

Amateur Radio Bicycle Mobile Setup. Post #1554.

If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=2zWb-KnkGdY. Here's a way to use Amatuer/Ham Radio while you work on shedding a few pounds in useful exercise.  Why not equip your bicycle for 2 meter/70 cm mobile operation? In this short, well-made video, "taverned" shows us how he used a mag mount antenna, a simple C clamp, and a basic ground system to convert his mountain bike into a mobile station.  The project is straight forward, simple, and gives you emergency communications while you peddle down the road. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). https://hamradiohawaii.wordpress.com. https://bigislandarrlnews.com. https://amateurradionewsinformation.com (Amateur Radio News & Information).

An 80-Meter Vertical Helix

Like many amateur radio operators, I live on a small lot surrounded by neighbors, utility lines, and civic-minded citizens concerned about the "attractiveness" of my community.  Whether by design or outright fear, I've adopted the "stealth" approach to ham radio antennas.  It's the old "out of sight, out of mind" idea applied to amateur radio antennas. The amateur radio press is full of articles describing the struggle of amateur radio operators to pursue their hobby under the burdensome regulations of CC & Rs, HOAs, and other civic minded citizens who object to antenna farms.  So far, my modest verticals, loops, and inverted vees have blended well with the vegetation and trees bordering my small backyard.  Vertical antennas have always been a problem because of the limited space for a radial system.  There are times, however, where a shortened vertical for the lower HF bands (such as 80/75 meters) is necessary where horizontal space is lack