df antennas

df antennas

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• Experiments with 160m antennas - Experimentin wire antennas on top band using several type of aerials. This includes a 40 to 160 meters EndFed Half Wave kite antennas and 160m/80m loaded vertical antenna.
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• The End-Fed Half-Wave Antenna - Presentation - A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.
  [ Hits: 406 | Votes: 3 | Rating: 8.67 ]
• 1:49 unun for end fed half wave antennas - 1:49 UNUN using two stacked FT240-43 cores for end fed halfwave antenna. To match the end fed half wave antenna to the coaxial feeder, it is necessary to have a matching network or transmission line transformer.
  [ Hits: 398 | Votes: 10 | Rating: 8.1 ]

• Construction of a J-Pole antenna for 2 meter - If you like building good antennas, this one is for you. The J-pole is a slim, omnidirectional, half-wave antenna fed at the end through a quarter-wave shorted transmission line. Its predecessor is the famous Zepp antenna developed for the Zeppelin airship.
  [ Hits: 386 | Votes: 2 | Rating: 10 ]

• Spiral Antenna for SDR - Designing and Testing a PCB Wideband Spiral Antenna. The 800 MHz+ and 300 MHz+ spiral antennas by Hexandflex
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• Groundplane Antennas at Various Heights - Mounting on roof at the right ground level can greately impact on antenna performances because will affect the radiated angle of energy.
  [ Hits: 178 | Votes: 3 | Rating: 6 ]

• Radials on Vertical Antennas - Experimental Determination of Ground System Performance for HF Verticals
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• HyEnd Company - HyEnd is a dutch amateur radio antenna manufacturer. Makers of the popular HyEndFeed Antennas, produce Baluns, bandpass filters and selle Line isolators, coax cables and connectors.
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• Five Antennas Switch Box - A project of a 5 Antennas Relay Switch Box, all Switches & Relays have both contacts wired in parallel to improve reliability of operation, to prevent static build up, when an antenna is not in use the feeder coax is grounded.
  [ Hits: 1249 | Votes: 1 | Rating: 10 ]

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