quarter wave

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quarter wave

60 links

Antennas : 160M
  • 160m Kite Vertical Antenna - An essential kite antenna plan for the top band, Antenna has been tested at half wave and quarter wave.
    [ Hits: 262 | Votes: 1 | Rating: 10 ]
  • 160 meter antenna problems and solutions - The quarter-wave Marconi working against ground is a popular and inexpensive antenna for 160 meters. A lot of newcomers to the band favor this simple antenna because it's easy to put up, it isn't too big, and it works.
    [ Hits: 107 | Votes: 0 | Rating: 0 ]
Antennas : 23cm
  • GP Antenna for 1296 MHz - Quarter wave Ground Plane antenna for the 23 cm band, 1296 MHz.
    [ Hits: 65 | Votes: 1 | Rating: 10 ]
Antennas : 2M
  • 2m Quad Turnstile Antenna - The loops are made of 10 mm round aluminum tube. No bending pliers was used to gently bend 90 degrees to obtain a square with 53 cm inner sides. Each loop has an impedance of approximately 100 Ohm. To connect both radiators in phase, a quarter wave long feeder of 100 Ohm is required.
    [ Hits: 207 | Votes: 0 | Rating: 0 ]
Antennas : 30M Antennas : 40M : 40 meter Vertical Antennas
  • Vertical bazooka antenna for the 40m - A quarter wave vertical omni-directional antenna for 7 MHz. Formulas for dimensions in feet and meters are provided. Ideal radial angle is between 35° and 45°. Velocity factor (Vf) varies based on coax type.
    [ Hits: 135 | Votes: 7 | Rating: 6.85 ]
Antennas : 4M Antennas : 6M : 6 meter J-Pole Antenna
  • The Ugly MacGyver 6 meter J-pole Antenna - Essentially, a J-pole is a 1/2 wave resonant antenna connected to a quarter wave matching stub. The feedline is connected at a point on the matching stub that is at the feedline's characteristic impedance. The result is 3/4 of a wavelength on one side and 1/4 wavelength on the other side.
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
  • J-Pole Antenna for 50 MHz - This J-Pole is mounted on a fishing rod. The radiator L1 is an isolated copper-wire with a length of 281,5 cm while the quarter-wave matching sector L2 is made with 450-Ohm-Wireman-cable
    [ Hits: 223 | Votes: 0 | Rating: 0 ]
Antennas : 70cm
  • Cross-Yagi 10el Antenna for 70cm - 10 Elements Cross-Yagi Antenna for 433 MHz. The base of the 10el antenna is the recalculated RA6FOO antenna.Circular polarization is realized - by a phasing quarter-wave line, matching of horizontal and vertical polarization antennas
    [ Hits: 176 | Votes: 6 | Rating: 8.83 ]
Antennas : 80M
  • 80m Vertical - This is a FULL SIZE quarter-wavelength vertical made on a 18m Spiderbeam fiberglass telescoping Spiderpole
    [ Hits: 139 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators
  • Loaded Quarter Wave Antenna Inductance Calculator - Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole
    [ Hits: 163 | Votes: 0 | Rating: 0 ]
Antennas : Dipole
  • How to Tune Dipole Antennas - This is a standard calculation method that can help you while tuning dipole antennas, by adjusting wire lengths. This method can be used also when you need to add lenght to your wires, and can be additionally used to quarter waves vertical antennas
    [ Hits: 335 | Votes: 5 | Rating: 8.6 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • End-Fed Half-Wave Antenna for 20m 40m 80m - How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
    [ Hits: 141 | Votes: 1 | Rating: 4 ]
Antennas : Feed Lines : Coax Stubs
  • The Quarter-wave stub - The Quarter-wave stub can be used for many purposes. If it is left with an open end it can be used as a notch filter to attenuate certain frequencies. A quarter wave length of a transmission line can also be used as an impedance transformer, to know more about the Quarter-wave impedance transformer
    [ Hits: 136 | Votes: 1 | Rating: 8 ]
Antennas : J-Pole
  • 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: 384 | Votes: 2 | Rating: 10 ]
Antennas : Magnetic Loop
  • Magnetic Loop antenna for VHF - A magnetic loop antenna for the VHF band, featuring a high gain that can be compared to a quarter wave vertical antenna
    [ Hits: 733 | Votes: 9 | Rating: 5.99 ]
Antennas : Portable
  • The KC5LDO Vertical Antenna - Antenna for Field Day or Everyday. aA simple yet rugged six band quarter wave vertical antenna system perfect for field day or home use.
    [ Hits: 185 | Votes: 1 | Rating: 9 ]
Antennas : VHF UHF
  • Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
    [ Hits: 247 | Votes: 6 | Rating: 6.33 ]
  • Dual Band Quarter Wave Droopy Antenna - Adapted from a similar project by NA4IT. Made with one quarter wave 2 meter radiating element pointing upward and it is surrounded by four 70 cm elements.
    [ Hits: 344 | Votes: 1 | Rating: 9 ]

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