air antenna

air antenna

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• 160M Folded Counterpoise - An FCP is not magic. It has no gain. An FCP improves an antenna system by replacing more loss with less loss. Some have been able to erect better wires in the air because the small size of the FCP allowed better placement of the antenna.
  [ Hits: 252 | Votes: 0 | Rating: 0 ]

• Two elements Telescopic Yagi for 2 Meters - A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
  [ Hits: 162 | Votes: 0 | Rating: 0 ]

• Hairpin antenna for 40m band - A modified Hairpin antenna for a wider bandwidth an mounted on a grounded metalic mast
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• G3JVL Vertical Antenna for 50 MHz - The G3JVL 6M ground plane vertical is a compact antenna that is ideal for portable operations. It packs away into a small bag only 1.3 metres long which is an ideal size for hand-baggage on aircraft.
  [ Hits: 246 | Votes: 2 | Rating: 9.5 ]

• DL7AHW Spraycan EH Antennas - Hairspray-can EH Antennas for shortwave and online programs. Small magnetic (H) antennas (Loops) have a good efficiency for the upper bands (20/15/10 meter band) and also in contrast to E-antenna a defined radiation direction.
  [ Hits: 316 | Votes: 2 | Rating: 8.5 ]

• End Fed Half Wave Antenna Coupler - A home made end-fed half-wave antenna coupler with antenna lenght calculator and counterpoise calculator based on center frequency. Includes pictures and drawings along to antenna homebrewing instructions with a home made on air wound transformer
  [ Hits: 282 | Votes: 0 | Rating: 0 ]
• EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
  [ Hits: 525 | Votes: 3 | Rating: 2 ]
• QRP End-Fed for 40m 20m 10m - This antenna build was strongly inspired by the well known PAR end fed antenna. The matcher box uses a T82-43 Fair-Rite core.
  [ Hits: 170 | Votes: 3 | Rating: 9.67 ]

• 20m Indoor Loop Antenna - This antenna can gets you on the air on 14MHz, and it has a useable frequency range. The VSWR is almost perfect at the centre-frequency abd the design uses no expensive components.
  [ Hits: 668 | Votes: 4 | Rating: 6.75 ]

• 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: 385 | Votes: 2 | Rating: 10 ]

• Horizontal Loop Antenna Experiments - The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.
  [ Hits: 926 | Votes: 5 | Rating: 8 ]
• Vertical Full Wavelength Loop - Consider installing a stealth vertical loop antenna if you live in a place with no antenna restrictions. Full wave loop wire antennas allow you to be on the air without installing evidente external aerials.
  [ Hits: 457 | Votes: 1 | Rating: 8 ]

• Magnetic Loop HF antenna - An homebrew HF Magnetic loop made with 2m length of 6mm diameter copper pipe formed into a near circle as the low loss inductor, a short length of coax as a capacitor,a short length of mains cable, again as a fixed tuned capacitor, a tunable 365pF air spaced capacitor, and a small Jackson C804 airspaced variable with a small 3-35pF trimmer in parallel
  [ Hits: 131 | Votes: 0 | Rating: 0 ]

• Open-Folded W8JK Antenna for HF - Originally designed by John Kraus, W8JK in about 1940, this antenna has some interesting properties. The W8JK antenna is 2 (Two) centre-fed double-dipole fed by a pair of anti-phase signals. Small size, simple antenna, offer nice performance but need a tuner. Tested in this project from 30m to 6m bands
  [ Hits: 141 | Votes: 1 | Rating: 3 ]

• Designing VHF/UHF Quad Antenna - The information in this article has come from many amateur sources, the most notable was from WA6TEY (sk 1985) Ray Frost, who was a pioneer of VHF Quad designs and one of the best Southern California Transmitter Hunters. Ray built hundreds two meter quads in single and paired configurations as well as his famous mobile radio direction finding quad.
  [ Hits: 974 | Votes: 7 | Rating: 8 ]

• The Loop on Ground Antenna - An experimental antenna for HF reception. It consists of a single loop element mounted on the ground. It is stealthy, small, and quiet. EZ-NEC plots and on-air test results are included.
  [ Hits: 301 | Votes: 3 | Rating: 8 ]

• Cushcraft R7000 Prob/Repair - Repairing a Cushcraft R7000 antenna featuring several problems, mostly concerning coils and the insulating parts of the antenna.
  [ Hits: 209 | Votes: 1 | Rating: 10 ]

• Airplane scattering - Operating on Airplane scattering. Scattering of radio signals by airplanes. An introduction to operating ariplane scattering, using aircraft to redirect RF that would otherwise be lost in space. Antenna Pointing, Doppler Shift/Digital Modes, using digital modes to operate airscatter.
  [ Hits: 160 | Votes: 0 | Rating: 0 ]

• The K4ICY Antenna Launcher - The Steampunk-styled air cannon sending tennis balls flying at 500 mph!
  [ Hits: 157 | Votes: 0 | Rating: 0 ]

• Repairing Rotators - An article on CDE/Hy-Gain/MFJ antenna rotator repairing
  [ Hits: 438 | Votes: 0 | Rating: 0 ]

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