Monday, February 24, 2020

100 watt 7 MHz magnetic loop antenna for units and apartments

If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=Cv_RnLpZ9gw.  This is Post 2155 in a continuing series of simple ham radio antennas.

Radio amateurs living in urban apartments or in deed-restricted housing often have a difficult time getting on the air because of limited antenna options.

In this video, Australian ham Peter Parker (VK3YE) gets around the limited antenna space problem by building a fairly compact magnetic loop antenna for the 40 meter Amateur/Ham Radio band.

Here are some of Peter's observations:

"A description and demonstration of an ultra-simple but 100 watt capability 7 MHz magnetic transmitting loop for units and apartments. There are no hard to get parts or complex workshop skills required to build. Instead of the expensive vacuum variable capacitor, the loop is brought to resonance with a length of RG213 coax (approx 1.85 metres for a 3m circumference loop for 7 MHz). The sliding capacitor's dimensions are not critical but are approximately 6 x 8 cm. As demonstrated performance is excellent and would be significantly better than lighter and more portable loops. It would thus make an excellent project for apartment or unit dwellers who have limited room for other HF antennas. CAUTION: Hazardous high voltages can develop across the capacitor on transmit with this (or any other) magnetic loop. Hence the loop should be operated in an out of reach location. For the same reason the loop should not be adjusted with RF applied even if only QRP. A full article on this loop appears in November 2014 Amateur Radio magazine. Also some notes at http://home.alphalink.com.au/~parkerp... PS: To support this channel please start your Amazon Shopping here (no extra cost to you) https://www.amazon.com/?&_encoding=UT..."
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http://www.HawaiiARRL.info.
http://www.arrl.org.
http://www.blubrry.com/arrlaudionews/
http://www.southgatearc.org.
http://www.hamradioupdate.com.
https://oahuarrlnews.wordpress.com.
https://hamradiohawaii.wordpress.com.
https://bigislandarrlnews.com.
https://www.eham.net.
http://paper.li/f-1576465810 (breaking Amateur/Ham Radio News).

Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

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Aloha es 73 de Russ (KH6JRM).