A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas.
6' High 40m EFHW Real World SH*F Antenna-Concept and Intro
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Here's a great emergency HF antenna for radio amateurs from Charles Kirshman (N8NK).
The antenna is a modified end fed half wave (EFHW) configured as a NVIS (near vertical incident skywave) system. The antenna provides excellent local and regional coverage with an average height above ground at 6-feet (1.829 meters).
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=FuSpz3yqsEc.
Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).
Here are some comments from Charles (N8NK):
I felt like I never gave the ‘low 40m EFHW’ antenna concept a fair chance.
Here's an example of a recent QSO using a 20m 6' high dipole: • Working Texas with a 6' High Ultra Lo...
Wire element: ~55' long? I'll measure it after testing
Height AGL: 6 feet
UNUN: Multi-tap
Tap used: 81:1
SWR: 1.0:1
Power: ~5.5 watts RMS
Yes, I worked a few DX contacts with it – including to the Czech Republic. Hey, I must brag while I can! The performance of a wire two feet above the ground is miserable of course. I wasn’t seriously thinking of using it for anything other than screwing around. Same thing with the ‘Variant 9’ version. And my ‘deck antenna’? That is serious boredom in action. Just doin’ my job, man… just doin’ my job (screwing around).
But today I thought to myself “No – the testing isn’t complete or even fair. I must see what a real world SHTF antenna might look like.. what it might act like.. who it can talk to RELIABLY...”
Let’s find out.
First contact to follow (I hope!)
73
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If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=aeNHIQ_j4Dk This well-produced and richly illustrated tutorial on the classic G5RV HF Dipole Antenna was presented to the Brandon Amateur Radio Society in Brandon, Florida in 2017 by Bernie Huth (W4BGH). Bernie does an excellent job of explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV). Although Varney envisioned his design primarily as a 3/2 wavelength antenna for the 20 meter Amateur Radio band, radio amateurs have used the antenna for multiband use. The G5RV is an excellent choice for the 20 meter band. Performance on other HF Amateur Radio bands is good enough to qualify as stand alone HF antenna if you can only erect one HF antenna. 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 wee
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Aloha es 73 de Russ (KH6JRM).