moonraker antenna11 links
- Folding the Dipole
- Invented by Heinrich Hertz in around 1886, the half wave dipole is still one of the most simple and practical of antennas and still very much in use today. It consists of a half wavelength long centre fed conductor
[ Hits: 2181 | Votes: 2 | Rating: 5.50 ]
- Feeder Radiation
- Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes
[ Hits: 1658 | Votes: 1 | Rating: 1.00 ]
- The Coaxial Line
- Impedance matching, Transmission Lines, Characteristic Impedance, VSWR & Mismatch and Antenna Losses
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- Antennas for MF and LF
- Long Waves, Short Antennas, designing antennas for MF and LF communications
[ Hits: 2018 | Votes: 1 | Rating: 2.00 ]
- Quarter Wave Verticals
- One of the most useful antennas in the repertoire is the Marconi or quarter wave grounded vertical antenna. Its invention made it possible to halve the length of antennas, simplifying communications, especially at HF and below.
[ Hits: 1652 | Votes: 2 | Rating: 7.00 ]
- About broadband
- What you gain and what you lose.
While broadband and electrically small antennas may look attractive on the surface, they are by necessity compromises and usually donít work as well as tuned antennas.
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- Azimuth Radiation Patterns
- Below VHF the change in the radiation characteristics of an antenna will change considerably from frequency to frequency, making antenna selection more complicated.
[ Hits: 723 | Votes: 1 | Rating: 10.00 ]
- Matching Waves, VSWR at work
- When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.
[ Hits: 420 | Votes: 0 | Rating: 0.00 ]
- 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: 878 | Votes: 2 | Rating: 5.50 ]
- Moonraker 4 Antenna manual
- English manual of the AV-140Moonraker 4 antenna
[ Hits: 2609 | Votes: 19 | Rating: 6.06 ]
- When negative meets positive
- Lightning can be a serious hazard depending where you live in the world. Chances are that if you living in an area where lightning strikes are common and you have a communications antenna, it may be attracted to you.
[ Hits: 312 | Votes: 1 | Rating: 9.00 ]
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