Amateur hf aerials

In Introduction to HF — Part 2 , we covered transceivers and offered some tips on buying your first HF radio — Now we move onto the final and most important part of this article and your station : Aerials. In Part 1 , we touched on Skip, the way in which radio waves travel — A low-angle of take-off is desired for working far-away DX stations but a high-angle is more useful on bands like 40m where a more local contact may be desired. If you imagine a ball bouncing up and down, it gets progressively weaker with each bounce — This is much like how radio waves bounce off of the ionosphere. The signals take a long time to reach and hopefully bounce off the ionosphere before coming back down again. Before we get to the aerial, a few words about feeders: Coaxial cable is the easiest to work with, and even the thinner type such as RG58 can be used on HF frequencies. Coax, despite having a centre and outer, is an un-balanced feeder — But an aerial such as a dipole is balanced ie: 2 equal sides, a symmetrical antenna.
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Antennas, Antennas, Antennas...

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Introduction to HF - Part 3 of 3 : Aerials | Essex Ham

JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Vertical antennas are very popular for HF operation because they fit in well to a small garden. There are two types, those that are best installed at ground level and those that can be installed on top of a mast. All verticals need a good earth and those designs that look as if no earth is needed and can be counted at the top of a mast, are in fact usually half-wave vertical dipoles rather than quarter wave verticals.
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Introduction to HF – Part 3 of 3 : Aerials

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JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Choosing A Mobile Antenna. HF mobile opperation is a challenge not the least because the antenna is very short relative to a full size antenna.
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