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Showing posts from November, 2016

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

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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://bigisland…

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

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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 …

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

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Inexpensive 17-Meter Vertical Antenna
(http://www.eham.net/articles/37910).
Author:  K5DVW.
Accessed on 28 November 2016, 15:05 hrs, UTC.
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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 …

Simple Ham Radio Antennas--40 Meters Wire Yagi Antenna. Post #965.

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40 Meters Wire Yagi Antenna
(http://ve3vn.blogspot.it/2013/12/40-meters-wire-yagi-inverted-vee-html?m=1).
Accessed on 28 November 2016, 00:55 hrs, UTC.
Author:  Ron Schwartz (VE3VN).
Please click link or insert title URL into your browser search box to read the full article.

Comment:

If you'd always wanted a 2-element beam on 40 meters but couldn't afford the antenna or the tower need to support this aluminum structure, you may find this experimental antenna design from Ron Schwartz (VE3VN) interesting.

Although Ron hasn't built this antenna yet, he has run some preliminary design tests and thinks this antenna could provide the directivity you desire at a modest cost.

Basically, the antenna consists of two 40-meter inverted vee antennas.  Only one support is necessary for the boom.  The ends of the inverted vee are attached  to support roles leading to tie off points.

This would be a fun experiment for a weekend.  You can find most of the materials at the nearest hardware …

Simple Ham Radio Antennas--Easy VHF Antenna-A new way to build a 1/4 wave ground plane antenna. Post #964.

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Easy VHF Antenna-a new way to build a 1/4 wave ground plane antenna
(http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=32352).
(http://www.n1gy.com/easy-vhf-antenna.html).
Accessed on 26 November 2016, 15:40 hrs, UTC.
Author:  Geoff Haines (N1GY).
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Comment:

This interesting 2 meter/70 centimeter ground plane antenna built by Geoff (N1GY) should prove useful for radio amateurs who must use both VHF and UHF in their activities.  This antenna would be ideal for volunteers involved with ARES (Amateur Radio Emergency Service) or any other emergency communications agency.

The tutorial is simple and easy to understand, with a full list of materials and construction techniques included for quick assembly.  Geoff also provides helpful photographs to help you complete the project.

Geoff says the antenna works well for him, noting "While not a gain antenna design, placing the assembly on top of a 22-foot mast gives me all the…

Simple Ham Radio Antennas--Moxon Antenna Project. Post #963.

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Moxon Antenna Project
(http://www.moxonantennaproject.com)
(http://www.eham.net).
Author:  Steve Hammer (K6SGH).
Accessed on 25 November 2016, 19:55 hrs, UTC.
Comment:

I'm always looking for interesting antennas to build at my new QTH on Hawaii Island's Puna District.  While I was researching some new and unusual antenna designs, I ran across this article by Steve Hammer (K6SGH), which was cited in a sidebar from http://www.eham.net.

Although I've always been fascinated by the designs described by pioneer antenna guru Les Moxon (G6XN)--hence the name "Moxon Antenna"--I've never built one.  With this article, that time has come.

Steve Hammer (K6SGH), along with his late friend John Labutski (KD6WD), have compiled an extensive list of moxon antenna designs that will fit comfortably on your property, be it urban or rural.  According to Steve, a moxon antenna can be built with "a simple push up mast and rotated by hand."  Steve adds that "The moxon…

Simple Ham Radio Antennas--Mini Whip Antenna. Post #962.

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Mini Whip Antenna
(http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=29166).
Author:  Roelof Bakker (PA0RDT).
Please insert title or URL title link into your search browser to read the full article.
Accessed on 24 November 2016, 20:40 hrs, UTC.
Comment:

If you want to monitor VLF and shortwave signals without drawing attention to a large outdoor antenna, then try this intriguing antenna design from Roelof Bakker (PA0RDT).

The "Mini Whip" antenna for VLF and shortwave radio reception is a small device capable of excellent performance on the very low frequency (VLF) bands, as well as the HF shortwave frequencies.  The antenna is about the size of a ball point pen and uses a copper plate and J-310 FET to receive and amplify the signal.

Roelof provides a series of graphs and records to support his reception claims. As with most small antennas, it helps to mount the device outside if you can.

This antenna would be ideal for radio amateurs and shortwave listeners living in deed-rest…