DDRR: Difference between revisions
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==External links== | ==External links== | ||
* [http://www.orionmicro.com/ant/ddrr/ddrr1.htm The DDRR Antenna] from VE2GMI | * [http://www.orionmicro.com/ant/ddrr/ddrr1.htm The DDRR Antenna] from VE2GMI | ||
* [http://www.antennex.com/preview/2mddrr.htm Build a 2 metre DDRR antenna] from [http://www.antennex.com Antennex] | |||
{{antennas}} | |||
Latest revision as of 10:58, 9 April 2009
Related wiki pages: Antennas, Gain, SWR, Front-to-back ratio, harmonics, Propagation, Bands
What is DDRR?
DDRR means Directional Discontinuity Ring Radiator
External links
- The DDRR Antenna from VE2GMI
- Build a 2 metre DDRR antenna from Antennex
| Antennas | |
| Design | Beam * Dipole * Dish or Parabola * DDRR * Log Periodic (LPDA) * Loop * Mobile and portable * Omnidirectional * Panel * Quad and Quagi * Screwdriver * Small tuned loop * Vertical * Yagi-Uda * Wire and random wire antennas |
| Installation | Antenna Tuners * Capacity hats and loading coils * Cavity filters * Coaxial Cable * Feedlines * Rotators * Towers and Masts * VK2ACY - G5RV coupler |
| Theory | Front-to-back ratio * Impedance matching * SWR * Tower design * Vertical Antenna efficiency * Wire comparison tables |