Friday, December 2, 2016

Simple Ham Radio Antennas--EFHW-8010 8-band End Fed Half Wave Antenna. Post #970

EFHW-8010 8-band End Fed Half Wave Antenna
(http://www.eham.net/reviews/detail/12423#144831).
Accessed on 02 December 2016, 17:45 hrs.
Source:  http://www.eham.net.
Please click link or insert title URL into your browser search box to read the full review of this antenna.
Comment:

Although I prefer to build most of my antennas, this antenna from http://myantennas.com may change my mind--at least where portable or emergency antennas are concerned.

In this article from http://www.eham.net, we see a wide selection of reviews concerning the EFHW 8010 8-band End Fed Half Wave Antenna.  All of the reviews give a positive  reaction to the antenna which covers the 80-40-30-17-15-12, and 10 meter Amateur Radio bands without an antenna "tuner."  Several reviews claim the antenna is workable on 160 and 6 meters as well.

The antenna comes pre-assembled and can be used in a variety of configurations, depending on your operating requirements.  The antenna is also "stealthy" so it can be used in HOA/CC&R situations.  The cost is fairly reasonable for what you get--$119.95.  If you want more information about this multi-band end fed antenna, please visit this site:

http://myantennas.com/wp/product/efhw-8010.

Here are some Amateur Radio-related sites that may interest you:

http://www.HawaiiARRL.info
https://oahuarrlnews.wordpress.com
https://bigislandarrlnews.wordpress.com
http://www.kh6jrm.info (breaking news of interest to radio amateurs)
http://hawaiisciencedigest.com (the latest science and technology news)

Be sure to check out the blog sidebars for additional antenna and propagation resources.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM)

Thursday, December 1, 2016

Simple Ham Radio Antennas--80m END FED NVIS FIELD ANTENNA


If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=jiaHtmOB57Y. This is post #969 in a continuing series of simple ham radio antennas. Near Vertical Incidence Skywave Antennas (NVIS) are ideal for local or regional contacts, especially during times of natural or human-caused disasters.  HF NVIS antennas form the emergency "backbone" to the VHF/UHF bands usually used for local emergencies.  If repeaters are lost or greater distance is required to contact emergency management officials, then simple, portable NVIS antennas can provide the necessary "gap filler."  A properly designed NVIS antenna can provide reliable communications up to 300 miles/480 km or more depending on propagation.

In this video, NG9D describes a basic, easily-made 80 meter NVIS antenna suitable for portable or emergency use.  NG9D provides installation details, theory of operation, and a brief demonstration of how the antenna is deployed and used.  You may want to make one of these NVIS antennas for your emergency "go kit."

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 of interest to radio amateurs)

For the latest science and technology news, please check out this website:

http://hawaiisciencedigest.com.

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).

Wednesday, November 30, 2016

Simple Ham Radio Antennas--Electronics-Notes. Post #968

Electronics-Notes
(https://www.electronics-notes.com)
Accessed on 01 December 2016, 01:25 hrs, UTC.
Author:  Electronics-Notes (UK).
Please click link or insert the title URL into your browser search box to read the full list of articles.
Comment:

"Electronics-Notes" provides clear and concise radio and electronics tutorials for you to learn electronics online.  This website can be used in conjunction with a basic amateur radio licensing class.

The website is divided into several easily understood sections:

Basic electronics concepts
Testing and Test Equipment
Electrical components
radio
Ham Radio
Constructional Techniques
Audio-visual concepts
Antennas
Propagation
Becoming an engineer
Radio and Electronics History
Morse Telegraphy History

This guide will serve as a basic introduction to electronics and amateur radio.

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

For the latest news from the science and technology communities, please visit this website:

http://hawaiisciencedigest.com

Be sure to check the blog sidebars for additional 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)

Tuesday, November 29, 2016

Simple Ham Radio Antennas--Improving the Super-J. Post #967.

Improving The Super J
(http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=32360)
Author:  John Higgins.
Please click the title link or insert the title URL into your browser search box to read the full article.
Comment:

Fascinating article from antenna engineer John Higgins.  In this richly documented article, Higgins show us how to improve the already excellent performance of a VHF/UHF J-Pole antenna.

According to Higgins, the collinear J-Pole antenna, commonly referred to as the "Super-J", improves the efficiency and performance of a regular J-Pole.  Higgins says the key to successful "Super-J" design is "the phasing stub with a simple coil."  This stub allows for only a small separation between the two half-wave radiators in this antenna.

Mr. Higgins backs up his design with photos, SWR curves, impedance charts, radiation patterns, and actual on-air experience.  The "Super-J" antenna is easily made from locally available materials.  Why not make a "Super-J" for your VHF/UHF operations?  You may never go back to an ordinary J-Pole antenna again.

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

http://www.kh6jrm.info
http://www.HawaiiARRL.info
https://oahuarrlnews.wordpress.com
https://bigislandarrlnews.wordpress.com

For the latest science and technology news, please visit this web site:

http://hawaiisciencedigest.com

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM).

Monday, November 28, 2016

Simple Ham Radio Antennas--Inexpensive 17-Meter Vertical Antenna. Post #966

Inexpensive 17-Meter Vertical Antenna
(http://www.eham.net/articles/37910).
Author:  K5DVW.
Accessed on 28 November 2016, 15:05 hrs, UTC.
Please click link or insert title URL into your browser search box to read the full article.
Comment:

Do you want a stealthy, inexpensive, and easy to make antenna for the 17-Meter Amateur Radio band? The antenna designed by K5DVW may be what you're looking for.  Using easily available materials, K5DVW has designed and built a vertical antenna for 17 Meters (18.068 MHz-18.168 MHz) that will fit comfortably in your back yard and will use natural vegetation to protect its presence from nosey neighbors.  K5DVW uses two elevated ground radials to get good earth coupling.  The radials are mounted about 0.1 wavelength above ground, making them "only a little higher that 5 feet (1.52 meters) off the ground." PVC pipe and PVC pipe caps support the antenna.  Plan on using about 30 feet (9.14 meters) of wire for the vertical element and the two above ground radials.  K5DVW supplies photographs, graphs, and SWR curves for your reference.  Make one of these antennas today and enjoy the DX available on 17-Meters.

For more 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

For the latest develoments in science and technology, please visit:

http://hawaiisciencedigest.com.

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

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM).