stub

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stub

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Antennas : 6M
  • Halo and Stub antenna for 50MHz and 70MHz - Omni-directional mixed polarisation antenna for 50MHz & 70MHz. This is a simple Halo and Stub antenna which provides an omni-directional radiation pattern with mixed polarisation, which I built for use with the SUWS WEB SDR
    [ Hits: 137 | Votes: 1 | Rating: 9 ]
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 ]
  • 50MHz / 6m J-pole Antenna by VK4ADC - The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarized antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
    [ Hits: 439 | Votes: 4 | Rating: 6 ]
  • Home Built six meter J-Pole Antenna - This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure. This antenna uses flat 450 ohm Window Line for the tuning stub.
    [ Hits: 225 | Votes: 1 | Rating: 9 ]
Antennas : Delta loop
  • 2 Elements Delta Loop for 14 MHz - A delta loop antenna for 20 meters band designed with MMana with a tuning system made in a classic stub configuration
    [ Hits: 527 | Votes: 2 | Rating: 6.5 ]
Antennas : Dipole
  • 50 Ohm Coaxial Dipole - This dipole is composed by a coaxial structure and non-folded dipole made from two open conductive cylinders, and benefits from the stub compensation of a folded dipole by passing an insulated wire through the axis and connecting it to the ends of both limbs. By G4CQM
    [ Hits: 618 | Votes: 1 | Rating: 3 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • 20m Half-Wave End Fed  updated - A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
    [ Hits: 1841 | Votes: 7 | Rating: 8 ]
  • End Fed Half-Wave Antennas - An interesting article on end fed half-wave wire antennas with a couple of original experiments. Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.
    [ Hits: 287 | Votes: 2 | Rating: 10 ]
Antennas : Feed Lines : Coax Stubs
  • Coax Stubs and Band Pass Filters - Will additional coax stubs improve Band Pass Filter performance?
    [ Hits: 661 | Votes: 1 | Rating: 2 ]
  • Coax Stubs for 20m and 40m - When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters
    [ Hits: 243 | Votes: 4 | Rating: 8.5 ]
  • Optimizing Harmonic Attenuation Stubs - Optimizing the Performance of Harmonic Attenuation Stubs
    [ Hits: 315 | Votes: 0 | Rating: 0 ]
  • Coax Notch Traps - Attenuating adjacent bands - Targeted Attenuation for Adjacent Bands. Filtering is needed between the two rigs to prevent physical damage to the RX front end and to prevent the kinds of high-signal overload conditions like desense and IMD - as well as containing harmonic energy.
    [ Hits: 134 | Votes: 0 | Rating: 0 ]
  • 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: 134 | Votes: 1 | Rating: 8 ]
Antennas : J-Pole
  • Tri-Band J-Pole - This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and a quarter stubs to achieve low angle radiation pattern. Designed with 4nec2 NEC based antenna modeler and optimizer for 145/220/440MHz bands
    [ Hits: 1913 | Votes: 5 | Rating: 9 ]
  • Improving Gain of the Super J-Pole Antenna - The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.
    [ Hits: 189 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Quarter Waves and Velocity Factor - Coax Velocity Factor in Baluns, Does it Matter? Test results show coaxial cable velocity factor does not always enter into stub length calculations especially in the world of Baluns
    [ Hits: 208 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Vertical Antenna : GAP Titan
  • GAP Titan DX - Tuning Bands - Picture taken from official manual with notes on tuning stubs for each band
    [ Hits: 910 | Votes: 2 | Rating: 7.5 ]
Technical Reference : Filters
  • RTLSDR Coax Stub - Cutting out the noise using a simple coax filter to improve the poor front end filtering
    [ Hits: 753 | Votes: 2 | Rating: 5.5 ]
Technical Reference : TVI Filters

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