Monday, September 26, 2016

Simple Ham Radio Antennas--Terminated Inverted U low noise antenna. Post #907.

Terminated Inverted U low noise antenna.
(http://www.crosscountrywireless.net/terminated_inverted_u.html).
Accessed on 26 September 2016, 19:55 hrs, UTC.
Author:  Chris Moulding (G4HYG).
Please click title link or insert title URL into your browser search box to read the full report.

Comment:

Do you live in a high-noise environment that makes HF operations difficult? Then, this article from Chris Moulding (G4HYG) may be your way out of received noise and into a better HF operating experience.

Chris has come up with something he calls the "Terminated Inverted U low noise antenna."  The concept is based on the EWE antenna designed by Floyd Koontz (WA2WVL), who published an article in "QST" back in 1995.

Chris says his adapted design is low noise on receive, covers a wide bandwidth between 1.8 MHz and 70 MHz, and can handle around 200 watts of power.

Chris does a good job of covering the theory, construction, and use of this antenna.  He provides useful diagrams, wire measurements, mast requirements (two telescoping fishing poles), and antenna modeling software (4NEC2) for the project.

This antenna may help you conquer urban noise and get back into the stream of HF operations.

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For the latest Amateur Radio news and information, please visit my news site at http://www.kh6jrm.info.

Be sure to check the blog sidebars for other antenna articles and ideas.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM).

Saturday, September 24, 2016

Simple Ham Radio Antennas--Discover the Discone for HF. Post #906.


If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=N5U2_D_G5zE. Nice, compact tutorial from Stan Gibilisco (W1GV) on the theory, design, and use of HF Discone Antennas.  Although most discone antennas seem to be used on the amateur radio VHF/UHF bands and by public service agencies, there are a few HF discone antennas in use, particularly in military or government service.  The antenna is broadbanded and offers coverage from 40 meters through 10 meters. A HF discone antenna may be an interesting project.

For the latest Amateur Radio news and information, please visit my news site at: http://www.kh6jrm.info.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM).

Friday, September 23, 2016

Simple Ham Radio Antennas--U.S. Sharpens Surveillance of Crippling Solar Storms. Post #905.

U.S. Sharpens Surveillance of Crippling Solar Storms
(http://www.nature.com/news/us-sharpens-surveillance-of-crippling-solar-storms-1.20630).
Accessed on 24 September 2016, 01:15 hrs, UTC.
Reporter:  Alexandra Witze
Please click link or insert title URL into your browser search box to read the full article.

Comment:

It's only a matter of time before a X-Class solar flare or strong Coronal Mass Ejection hits Earth head on with devastating results to our power grids, communications, and our digitally managed economies.  If we're not prepared for the inevitable, we could wake up the next morning in the 19th century.

By early October 2016, NOAA should have a better idea of just how dangerous X-Class flares and CMEs are, thanks to a new method of predicting the intensity of solar geomagnetic storms.  Scientists have successfully integrated the data gained from sun-orbiting satellites into a new model that "spells out which power grids are at risk" from intense solar activity.  The new tool should give us some advanced warning of intense solar activity, so that sensitive medical, communications, and economic systems can be better protected.

This quest is urgent, considering the past effects of solar storms, beginning with the 1859 Carrington Event that destroyed telegraph stations to the 1989 solar flare that wiped out Canada's entire Hydro-Quebec grid for hours, leaving millions of people without power.  Solar flares have "friend" transformers in South Africa and overheated transformers at a Swedish nuclear power plant.

As radio amateurs, we should be aware that our solid state, digitally sophisticated equipment is equally susceptible to damage.  That's why I have an old tube rig standing by in case my more modern transceiver becomes an expensive door stop.  It might be advisable to build a Faraday Cage or other shielding device for your transceivers in the event we are warned of a super strong solar flare.  You may also want to consider alternate power sources should the flare destroy the electric grid.  The warning is out. The time to prepare is now.

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For the latest Amateur Radio news and information, please visit my news site at http://www.kh6jrm.info.

For the latest Hawaii Island amateur radio news, please visit http://bigislandarrlnews.wordpress.com.

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

Aloha es 73 de Russ (KH6JRM).


Thursday, September 22, 2016

Simple Ham Radio Antennas--Tri-Band Fan Vertical for 40-80-160m. Post #904.


If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=pMexeDPeRIM. I've heard of fan dipole antennas, but this video shows something different in the "fan dipole family"--the fan vertical HF antenna. Corey Klumper (N0ECK) of Russell, MN show us how he modified the fan dipole concept into something useful for those of us using vertical HF antennas.  The nicely done video shows us the complete design and assembly process.  Corey says his fan HF vertical covers the 40-80 and -160 meter bands.  He used this antenna successfully in the 2015 contest season.  You may want to build a version of this intriguing antenna for your station.

For the latest Amateur Radio news and information, please visit my news site at: http://www.kh6jrm.info.

If you're an amateur radio operator in my home state of Hawaii, please check into my Hawaii ARRL news site:  http://bigislandarrlnews.wordpress.com.

Opinions expressed in this blog are mine unless otherwise stated.

Thanks for joining us today!

Aloha es 73 de Russ (KH6JRM).

Wednesday, September 21, 2016

Simple Ham Radio Antennas--Winding a 1:4 Current Balun with 8 turns. Post #903.


If you're having trouble viewing this video, please insert this title link into your browser search box: https://www.youtube.com/watch?v=AJHfzeqaW5U. Nicely done video from N7JFP on winding a simple 1:4 current balun. For this balun, he used a single torroid core T-130-2 and two sets of 18 gauge copper wires. Each side of the torroid has turns of wire.  The balun covers 14 MHz through 54 MHz and would make a good foundation for a balanced antenna transmatch (i.e. "tuner") using 450 ohm ladder line or 300 ohm television twin lead for an antenna feeder.  A good project for a rainy evening.

For the latest Amateur Radio news and information, please visit my news site at http://www.kh6jrm.info.

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

Opinions in this blog are mine unless otherwise stated.

Thanks for joining us today!

Until next time!

Aloha es 73 de Russ (KH6JRM).

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