Posts

A Simple Short Vertical HF Antenna. Post #1069.

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If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=8_Axs2ut7sE. This truly inspirational video is for all of us who are reluctant to go portable and have difficulty with CW .  In this video, "Radio Prepper " show us a simple portable "go kit" and an even simpler HF vertical antenna that will get you on the air quickly from a remote or emergency operations site.  The 19-foot/5.79 meter antenna wire is supported by a 18.29-foot/6 meter telescoping fiberglass pole. The end-fed wire is connected to an EARCHI 9:1 Unun, which is then connected by a short length of coaxial cable to  an EM-2ATU ( antenna tuning unit ).  This assembly is then connected to an Elecraft KX2 transceiver.  A counterpoise wire runs from the EM-2ATU along the top of the ground. Using this arrangement, "Radio Prepper" was able to get several contacts, including one from Sweden . This simple HF Amateur Rad

160M antenna for small lots or gardens. Post #1068.

160M antenna for small lots or gardens (http://www.dxzone.com/dx32549/160m-antenna-for-small-lots-or-gardens.html). Author:  OZ1CX. Accessed on 11 March 2017, 20:35 hrs, UTC. Please click link or insert title URL into your browser search box to read the full article. Comment: As the solar cycle declines to minimum, it's time to explore the lower HF bands (160, 80, and 40 meters) to see what they offer during this period of poor propagation.  These bands don't suffer the severe loss of signals now being found on all bands above 40 meters.  Forty meters is usable both day and night, with 80 and 160 meters doing fairly well after sunset and just before sunrise.  Perhaps it's time for you to get on 160 meters and see what's happening. The one great drawback for 160 meters is the size of the antenna, where a full-size horizontal dipole can reach more than 260 feet/79.26 meters for 1.800 MHz. Even an inverted L antenna can be large.  Vertical 1/4 monopoles can be u

How to construct a multi-band dipole using speaker wire. Post #1068.

How to construct a multi-band dipole using speaker wire. (http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=32580). Author:  James Stevens (M0JCQ). Accessed on 11 March 2017, 04:45 hrs, UTC, Post #1068. Please click link or enter title URL into your browser search box to read the full report and to view the photos. Comment: Here's another great multi-band dipole antenna for those living in deed-restricted homes or apartments. In this well-written and easy to follow tutorial, James Steven (M0JCQ) shows how some wire and connectors from eBay can make a "stealth" antenna that delivers good local and DX contacts. James provides a complete materials list and an easy step-by-step guide to building this simple, inexpensive dipole antenna that fits in an attic or loft.  In James's case, he was able to design a multi-band dipole antenna fed by a single coaxial feed line that covers the 40, 20, 17, and 15 meter Amateur Radio bands. The antenna closely resembles the popu

End fed portable all band dipole setup and 150W matchbox 9:1 unun

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If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=IQVTnKQuKaM. This is post #1066 in a continuing series of "Simple Ham Radio Antennas." The heart of this all band HF end fed halfwave antenna (160 meters to 6 meters) is the 9:1 unun transformer used to match the high impedance of the wire antenna to the low impedance of the HF transceiver.  The 9:1 unun is made from 20 gauge wire wound on a torroidal coil. You can order the full unun through eBay under "nelson_antennas."  The antenna can be configured as a vertical, sloper, or inverted vee. Adding a counterpoise system will improve efficiency and reduce ground losses. For the latest 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 (breaking news for radio amateurs). Other sites of interes

$20 HF Portable Antenna Project. Post #1065.

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If you can't view this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=leriedzr1Es. Here's a simple, inexpensive HF Portable Antenna that covers  20 meters (14.300 MHz), 12 meters (24.95 MHz), 11 meters (27.205 MHz), and 10 meters (28.400 MHz)...all with a SWR lower than 1.2 to 1.  The antenna is based on a design from Frank W. King (KM4IE).  Although there is no voice description of the antenna project, the photos, parts list, and operational details are clear enough. This antenna can be used in portable/emergency situations, as well as in areas where antennas are restricted. For the latest 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 (breaking news for radio amateurs). Other sites of interest: http://hawaiisciencedigest.com (science and technology news for radio amateu