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277 links - and 2 categories

Antennas : 2M
  • Easy VHF Antenna - A New Way to build a 1/4 Wave Ground Plane Antenna
    [ Hits: 1023 | Votes: 1 | Rating: 3 ]
Antennas : 40M
  • 2 element GP for 7 MHz - A 2-element Parasitic Ground Plane for 40 Meters concept antenna
    [ Hits: 890 | Votes: 3 | Rating: 7 ]
Antennas : 40M : 40 meter Dipole Antennas
  • The 40 Meter Inverted V Antenna - This 40 meter Inverted V antenna was tested and tuned at a height of 35 feet and proved excellent results. The ends of the antenna are about 11 feet above the ground. Article and video available
    [ Hits: 1478 | Votes: 9 | Rating: 8.67 ]
Antennas : 40M : 40 meter Vertical Antennas
  • 40m Vertical End-Fed Antenna - A quarter wave vertical end-fed antenna for the 40 meters band. As all vertical antennas, also this aerial requires a good earthing system. In this project the ground is composed by twelve 4, wires buried in the lawn by using a spade to create a slit to drop the wire into.
    [ Hits: 2688 | Votes: 7 | Rating: 5.43 ]
Antennas : 80M
  • 80M Grounded Half Loop - The grounded half loop describe in this article is basically a half wave length wire on 80 Meters
    [ Hits: 1116 | Votes: 1 | Rating: 1 ]
Antennas : Antenna Calculators
  • Ground Plane Antenna Calculator - This calculator is designed to give the vertical length of a quarter-wave ground plane antenna, and the length of each of the four radials for the selected frequency you have entered
    [ Hits: 901 | Votes: 61 | Rating: 5.34 ]
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 ]
Antennas : Four Square
  • 40 m Wire 4 Square Vertical Array - 40 meter four square vertical array using four full-size 40 meter ground plane antennas, using only two radials
    [ Hits: 1068 | Votes: 2 | Rating: 9 ]
Antennas : Installation
  • Broadcast Antennas on Buildings - When a broadcast antenna is to be placed on top of a building, there are special problems of feeding and grounding. The radiator is usually electrically short, that is, much less than one-quarter wavelength high.
    [ Hits: 358 | Votes: 2 | Rating: 10 ]
Antennas : Portable Antennas : Satellite Antennas : VHF UHF
  • Ground plane for 144, 222 and 440 MHz - Here we have a ground plane antenna mostly used for 144, 222, 440 Mhz. Its one of the simplest antennas to make. New hams can build this with little to no experience in antenna building.
    [ Hits: 1259 | Votes: 10 | Rating: 5.7 ]
Antennas : Vertical
  • Short Vertical Antennas and Ground Systems - Relevance of a proper ground systems on short HF vertical antennas, with an analysis on a vertical antenna for 160 meter band
    [ Hits: 458 | Votes: 0 | Rating: 0 ]
  • Radials on Vertical Antennas - Experimental Determination of Ground System Performance for HF Verticals
    [ Hits: 1396 | Votes: 9 | Rating: 6.67 ]
Radio Scanning : Aeronautical
  • Build your own ADS-B Ground Station - You can now build and run your own ADS-B ground station that can be installed anywhere and receive real-time data directly from airplanes on your computer
    [ Hits: 839 | Votes: 2 | Rating: 10 ]
Shortwave Radio : Numbers stations
  • Spy Numbers Forum - A Web forum dedicated to HF underground and in particular to Shortwave Pirate Radio Forums and Spy Numbers listenings
    [ Hits: 328 | Votes: 0 | Rating: 0 ]
Technical Reference : Antenna Switch
  • 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: 1244 | Votes: 1 | Rating: 10 ]
Technical Reference : Lightning Protection
  • About Lightning Protection - Ham Radio Station Grounding for Lightning Protection presentation
    [ Hits: 1739 | Votes: 2 | Rating: 9 ]
Technical Reference : QRM Eliminator
  • Noise Canceller Project - This project was intended to accompany the stealth antenna project. Author want to see how effective a noise canceller could be in reducing the background noise floor when attic / stealth antennas are being used.
    [ Hits: 708 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Locating Power Line Noise - RF interference from power lines is caused by arcing as high voltage electricity bridges a gap to a lower ground potential on the power pole. Corroded or loose connections, cracked insulators almost all of the hardware on a power pole can be the source of arcing.
    [ Hits: 426 | Votes: 0 | Rating: 0 ]

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