Skip to main content

Vertical Antennas-Ground Radials



If you can't see the video, please insert this title URL into your browsers search box:

https://www.youtube.com/watch?v=m-8P1-PfT9s

This is post 2343 in a continuing series of simple ham radio antennas.

In this well-paced, informal discussion of vertical antennas, Callum (M0MCX) examines the number of radial wires needed to make a 1/4 wave vertical more efficient.

When I first went on the air as a "novice" licensee (1977) the general advice was lay "as many radials as possible for each band used." Depending on soil and moisture conditions, you could have anywhere between 4 and 100+ radials to raise the efficiency of the vertical antenna.

Nowadays, the advice is tempered by the use of elevated radials, sophisticated counterpoise systems, and vertical antenna systems requiring few or no radials (1/2 wavelength verticals).

In this video, Callum considers both theoretical and practical aspects of the ongoing radial debate.  Here are some of his observations:

Ground Radials are a thing of "Mystique". I use the formula of using 4-wavelengths of wire in total, cut into random lengths to suit.All my radials are LESS than 1/8th of a wavelength. For 80m, my radials are around 2.4% of the wavelength. My experience and demonstration in a real-world solution will assist our thinking. HEY, Subscribe here: https://goo.gl/thM5Vq My Shop: https://www.m0mcx.co.uk/store/products/ Playlists: DX Commander: https://www.youtube.com/playlist?list... My Crazy Vlogs: https://www.youtube.com/playlist?list... Ham Radio Foundation Training: https://www.youtube.com/playlist?list... Goodies for radio buffs: https://www.youtube.com/playlist?list... Software for Radio Guys: https://www.youtube.com/playlist?list... Antenna Software Modelling: https://www.youtube.com/playlist?list... Ham Radio Tips: https://www.youtube.com/playlist?list... PS Sub-Titles help out some folks and non-English speaking people. If you are bi-lingual, you can help the others by contributing your time to closed caption subtitles here: https://www.youtube.com/timedtext_cs_.... Let me know if you've done this and I can give you appropriate credit. Enjoy your science folks. Good luck. Callum. M0MCX. DX Commander Founder
-----
See what you come up with on your next vertical antenna experiment.

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