normal antenna
11 links
- Trapped Dipole for 12 and 17 Meters
- A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italia
[ Hits: 882 | Votes: 1 | Rating: 1 ]
- Low Bands Battle Creek Antenna
- This antenna is designed for 40, 80 and 160 meters to complement a tri-band beam normally taken on DX peditions for 10, 15 and 20 meters, so six bands can be worked with only two antennas.
[ Hits: 136 | Votes: 0 | Rating: 0 ]
- 80m Shortened Dipole Antenna
- This antenna just requires about 24m of free space instead of 41m that a normal half wave 80m antenna needs to hang up. The so called loaded dipole uses a coil in every dipole arm to electrically lengthen the
mechanical too short dipole arms. Every coil has an inductivity of 120 microHenry.
[ Hits: 152 | Votes: 0 | Rating: 0 ]
- Sleeve Baluns
- Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF.
The balun can be inverted and used as a skirt to form part of the antenna element
[ Hits: 1017 | Votes: 1 | Rating: 4 ]
- Making a good balun
- The normal way to make a good balun is to wind a core with a bifilar winding about 8-10 turns, and then connect the coax to one side and the antenna to the other.
[ Hits: 499 | Votes: 0 | Rating: 0 ]
- Multiband portable wire antennas
- Vertical end fed antenna used for portable operations. The antenna will work on 80 with acceptable results, it will work fine on 40m, and it will be a good deal better than a normal 1/4 wave GP on 20, 17, 15 meters.
[ Hits: 186 | Votes: 0 | Rating: 0 ]
- Mobile Helix Antennas for HF
- Normal mode helix antennas for HF mobile. Photos andn plan for a 20 meters mobile helix antenna by N2MH
[ Hits: 13451 | Votes: 15 | Rating: 7.46 ]
- The normal-mode helix antenna
- A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
[ Hits: 3054 | Votes: 7 | Rating: 5 ]
- Normal Mode Helix Antennas for HF
- Normal Mode Helix Antennas for HF Mobile
[ Hits: 1595 | Votes: 4 | Rating: 3.75 ]
- Active receiving antennas
- An active antenna is sometimes used for receiving purposes in instances where a normal antenna would be impossible to accommodate in a physical sense.
[ Hits: 12621 | Votes: 6 | Rating: 5.5 ]
- 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 ]
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