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Antennas : 20M
  • Homebrew Travel Antenna - This is a low cost homebrew two band travel antenna for 20 and 40 meters. It is based on the B&W Travel Antenna concept with a telescoping whip and a loading coil
    [ Hits: 15055 | Votes: 11 | Rating: 6.36 ]
Antennas : Coils Antennas : Mobile
  • A $20 HF mobile antenna - A few hours of fun with PVC and wire and you’ve got yourself a respectable road radiator. The antenna consists of little more than some PVC pipe topped by a RadioShack replacement whip antenna and a couple of coils made from a small roll of #14 house wire.
    [ Hits: 8731 | Votes: 5 | Rating: 6.80 ]
Antennas : Portable
  • Antenna system in a shopping trolley wally - Multiband portable antenna system edited by Andy Foad G0FTD, consisting of an old cb antenna with it's 27Mhz matching coil, an antenna tuner, car battery and a transceiver
    [ Hits: 1707 | Votes: 2 | Rating: 10.00 ]
Antennas : Spiral
  • Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
    [ Hits: 2735 | Votes: 8 | Rating: 6.75 ]
Antennas : Theory
  • Antenna Efficiency - K0BG article con antenna efficiency covering topics like radiation resistance, coil losses and ground losses, other kind of losses. How calculate efficiency and Bandwidth Notes
    [ Hits: 283 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Antenna Parts : Aluminium Tubing
  • Pierce Aluminum - Distributor of aluminum and a manufacturer of finished aluminum products. Pierce Aluminum offers a diverse inventory and distributes a complete line of sheets, coils, plates, bars, structural shapes, tubes, pipes and extrusions in the most varied alloys and sizes possible
    [ Hits: 750 | Votes: 2 | Rating: 10.00 ]
Software : Circuit Design
  • HeliCoil - Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW
    [ Hits: 1696 | Votes: 8 | Rating: 4.88 ]
Technical Reference : Receivers : Regenerative Receiver
  • A good regenerative receiver - A good SSB-CW-AM regenerative receiver with a fine tuning by moving the wooden stick with a grounded piece of PCB towards the coil.
    [ Hits: 5111 | Votes: 7 | Rating: 7.71 ]
Technical Reference : Test Equipment
  • Grip Dip Oscillator - Originally eveloped by I1FLC, uses seven plug in coils covering 3.0 to 30Mhz in a Colpitts oscillator circuit.
    [ Hits: 219 | Votes: 0 | Rating: 0.00 ]
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