Monday, April 23, 2018

Inverted L Antenna for the TOP Band. Post #1471.


Inverted L Antenna for the TOP Band. Post #1471.

http://www.ai4ji.com?Projects/160minvertedl.htm.

Author:  AI4JI.

Accessed on 23 April 2018, 2129 UTC.

Please click link to read the full article.

Comment:

Now that the solar minimum is with us, radio amateurs are exploring contacts on the lower HF bands, such as 40, 80, and 160 meters.  LF and VLF enthusiasts are equally busy experimenting with antennas for 630 meters (472 kHz) and 2200 meters (137 kHz).

Antennas for these bands tend to be large and present coil and matching problems, resulting in low efficiency and power loss.

According to AI4JI, an inverted L Antenna designed for 160 meters (the TOP Band) can circumvent some of the more difficult matching problems.  In this brief post, AI4JI outlines a simple 160 meter inverted L Antenna built with commonly available parts, including 14 AWG stranded copper wire, three insulators, a 300pf-500pf variable capacitor, and a simple ground radial system.  For single band, 160 meter operations, you can use 50 ohm coaxial cable, such as RG-8 or RG-8X, as your feed line.  An antenna transmatch (i.e. "tuner") would be useful as well.  Try to use as many ground radial wires as you can fit on your property.   W0BTU recommends a basic ground radial system consisting of 35, 50 ft/15.24 meters-long buried wires.

For the latest Amateur/Ham Radio news and information, please visit these web sites:

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).

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

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Sunday, April 22, 2018

How to make a Ham Radio Speaker Wire Antenna. Post #1470.


If you can't see the video, please insert this title URL into your browser search box://https://www.youtube.com/watch?v=cqh0Ntus5G0.

A field portable or emergency HF antenna doesn't have to be fancy, expensive, or heavy.  In this video from KG6HQD, we learn how an antenna designed for SOTA operations (Summits On The Air) evolved into a simple, practical, and inexpensive HF antenna for both home and field use. 

Although the speaker wire antenna was designed for the 20 meter band, KG6HQD says his new Elecraft KX2 can work stations from 40 through 10 meters "with ease."  If you're looking for a good portable HF antenna, consider using ordinary speaker wire for the antenna elements.  You can make one of these antennas for emergency home use and another for portable or field use. 

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).

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

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Saturday, April 21, 2018

Modeling the Simple Inverted Vee Antenna, #102. Post #1469.


If you can't see the video, please insert this title URL into your browser searchbox: https://www.youtube.com/watch/v=oFE142IMo-s.

One of my favorite HF antennas is the classic inverted vee dipole--simple, effective, and inexpensive.  In this video from David Cassler (KE0OG), we get a full tutorial on this basic antenna which still serves radio amateurs today.

Dave says a few basic antenna modeling tool, such as EZNEC+, reveals a lot of vital information about this popular HF antenna, including the effect of height over ground, the amount of spreading between elements, and the type of mast used to support the inverted vee.  A properly designed inverted vee is the perfect antenna for both portable and home station use.

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).

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

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Friday, April 20, 2018

Ham Radio-Ground Spike Antenna. Using the earth to receive LF and VLF. Post #1468.


If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=jHK7kKsVVw0.

Here's an interesting, unconventional antenna that could open an entire new world of radio listening.  In this video from Kevin Loughin (KB9RLW), we learn how to use what Kevin calls a "Ground Spike Antenna" to tap directly into the earth for LF and VLF signals.  Now that radio amateurs in the U.S. and elsewhere are able to transmit in the 630 and 2200 meter bands, antennas such as the "Ground Spike" could help you explore the largely untapped universe below the standard AM broadcast band.  Kevin does an excellent job of showing just how easy it is to tap LF and VLF signals by using the earth as a key antenna element.  Build one of these antennas and prepare for some unusual listening, courtesy of the earth itself.

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).

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

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Thursday, April 19, 2018

How To Build A Delta Loop Antenna. Post #1467.


If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=1uUVMaRFMv4.

In this well-made video tutorial, Hiram Vazquez takes us step by step through the design, construction, and use of a Delta Loop HF Antenna.  As Hiram explains, delta loop antennas are fairly quiet on receive, show a bit of gain over a dipole antenna (about 3dB), take up little space, and are cheap to build.  Delta Loops can be both mono band and multiband, depending on how you feed the antenna.  If you use balanced feed line (300 ohm tv twin lead, 450 ohm ladder line, or home made 600 ohm balanced line) with a balanced "tuner", multiband use is possible. If you can use only one HF antenna on your property, the delta loop may be what you're looking for.

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).

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

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).