double x antenna
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Antennas : 2M- Squarooka Antenna - squared bazooka for 2 meters band
- Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel.
In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
[ Hits: 353 | Votes: 0 | Rating: 0 ]
- Double BiQuad Antenna Calculator
- Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g
[ Hits: 152 | Votes: 2 | Rating: 5.5 ]
- Extended Double Zepp NVIS Antenna Calculator
updated
- Extended Double Zepp measurements for all ham bands, and online calculator. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line
[ Hits: 123 | Votes: 3 | Rating: 7 ]
- Speaker Wire Doublet Antenna
- A portable wire antenna for the HF bands, made with a common speaker wire.
In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.
[ Hits: 390 | Votes: 4 | Rating: 9 ]
- Horizontal Loop Antenna Experiments
- The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.
[ Hits: 926 | Votes: 5 | Rating: 8 ]
- Multi Band Slinky Doublet Antenna
- An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
[ Hits: 461 | Votes: 1 | Rating: 10 ]
- The Infamous Attic Dipole
- An attic wire antenna with several modifications during the time. Began as a simple coax fed doublet antenna, and upgraded to a multi-band hf fan dipole, till the G5RV all deployed in an attic.
[ Hits: 100 | Votes: 0 | Rating: 0 ]
- Doublet antenna as vertical T
- A transmitting antenna 2x15m, about 100 foot doublet antenna fed by a ladder line of about 600 Ohm. Article in Polish and English,
[ Hits: 118 | Votes: 0 | Rating: 0 ]
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