what is an antenna

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what is an antenna

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Antennas : 70cm
  • 440 Mhz J-Pole Antenna plans - Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Author use 1/2 inch copper pipe, and the associated fittings necessary. The dimensions aren't typical however, this is what it took to get its SWR low.
    [ Hits: 20922 | Votes: 51 | Rating: 4.8 ]
Antennas : Baluns
  • Baluns on Log Perodic Antennas - Some antenna manufacturers place baluns at the incorrect location in LPDA arrays. If we consider what the balun does we can see how the mistake occurs.
    [ Hits: 1602 | Votes: 2 | Rating: 8.5 ]
Antennas : Dipole
  • Antenna here is a Dipole - What is a dipole antenna and why are they so popular ? Arrl PDF file
    [ Hits: 12625 | Votes: 13 | Rating: 5.46 ]
Antennas : Homebrewing Techniques
  • Conductors for HF Antennas - Putting up an antenna for the low bands? What kind of wire will you use? This analysis may change your plans.
    [ Hits: 2275 | Votes: 4 | Rating: 9.25 ]
Antennas : Multiband
  • Some plain facts about multiband vertical antennas - There is considerable confusion as to what exactly a multiband vertical antenna is. The confusion concerns the method of feed, how much mismatch one can expect, how many radials are required, how the particular antenna is built for multiband use, plus some other points.
    [ Hits: 1910 | Votes: 1 | Rating: 7 ]
Antennas : NVIS
  • NVIS - What it is and how to use it - An interesting article on NVIS antennas, explaining basics of NVIS antennas and the main usage of this particular aerials by Patricia Gibbons
    [ Hits: 5388 | Votes: 11 | Rating: 8.73 ]
  • About NVIS antennas - What is NVIS Near Vertical Incident Skywave
    [ Hits: 5959 | Votes: 10 | Rating: 5.5 ]
Antennas : Portable
  • Balcony antennas - What is the best balcony antenna? what antenna would you recommend for use on typical hotel balcony? Read some answers here
    [ Hits: 9808 | Votes: 2 | Rating: 1.5 ]
Antennas : Shortwave
  • Choosing wire for an antenna  pop - One of the most asked questions when it comes to antennas is what kind of wire should I use
    [ Hits: 32905 | Votes: 36 | Rating: 6.33 ]
Antennas : Theory
  • Small antennas and radiation resistance - Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.
    [ Hits: 883 | Votes: 0 | Rating: 0 ]
  • Amateur Radio Antennas: Ground Theory - Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?
    [ Hits: 6680 | Votes: 0 | Rating: 0 ]
  • Another way to look at vertical antennas - What iss the difference between a dipole and a vertical? Maybe not as much as you think. Come along and try another point of view.
    [ Hits: 4045 | Votes: 0 | Rating: 0 ]
Antennas : Theory : Antenna Gain
  • Antenna Gain on Trial - Most people think it's a good thing to have and the more the better. However, this is not always true - and the amount of gain is often not what it appears to be. Assuming higher gain is what you need, how do you determine what will give the best performance?
    [ Hits: 972 | Votes: 2 | Rating: 5.5 ]
Antennas : WiFi
  • Selecting a WiFi antenna - What is the best WiFi antenna for me? Looking for a range extender antenna for your WiFi system. This article will help in choosing the correct antenna for your system
    [ Hits: 5632 | Votes: 3 | Rating: 7.33 ]
Antennas : Wire
  • Portable Wire Antenna - W4ZT used this antenna for Field Day and other portable applications. He built them for all bands between 160 meters and 6 meters. You can make them easily using whatever wire you have available and make the insulators from scrap plastic
    [ Hits: 1919 | Votes: 2 | Rating: 7 ]
Operating Modes : Mobile
  • ARRLWeb: Automobile - Hams have been putting stations in their cars since the Twenties. Today, there is great satisfaction in facing the challenge of installing a transceiver in our small cars and pick-ups, using somewhat inefficient antennas
    [ Hits: 854 | Votes: 2 | Rating: 10 ]
Shortwave Radio : Beginner's guides
  • Getting Started in SW Listening - Excellent and exaustive guide to shortwave listening offered by monitoringtimes, includes operating guides, technical suggestions, buying guieds, antennas implementations and more, all what is needed by shortwave listening beginners.
    [ Hits: 5421 | Votes: 19 | Rating: 6.8 ]
Software : Antenna analysis
  • PolarPlot - Freeware antenna software that lets you see what the polar diagram of your rotatable beam actually looks like where it is operating. With PolarPlot you can measure the polar diagram of the antenna and check for abnormalities - compare plots taken before and after changes to the design or location - check the -3dB beamwidth - look at the front to back ratio - see the size and position of the sidelobes.
    [ Hits: 5985 | Votes: 10 | Rating: 5.59 ]
Technical Reference : Homebrew
  • DIY Basic Electronics and Antennas - DIY Basic Electronic Theory, Basic Antenna Theory with Antennas built from common materials. What does SWR really mean. Baluns from transmission line.
    [ Hits: 11368 | Votes: 15 | Rating: 7.85 ]
Technical Reference : Lightning Protection
  • About Lightning Protection - What You Should Know About Lightning Protection by Joseph H. Reisert
    [ Hits: 3118 | Votes: 1 | Rating: 8 ]

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