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Antennas : 2M- Big Wheel Antenna for VHF
- An omnidirectional horizontal polarization antenna for 2 meters band in Italian
[ Hits: 186 | Votes: 2 | Rating: 7.5 ]
- Omni-directional Antenna for 50 MHz
- This simple project, based on the orginal CobWebb-Antenna model, is about an horizontally polarized, omi-directional antenna for the six meter band.
[ Hits: 542 | Votes: 2 | Rating: 7 ]
- 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 ]
- J-POLE for 50MHz by IZ0UPS
- The J Pole antenna is a good omnidirectional antenna that can be used for portable or fixed station usage. It does not need a ground, and neither complex feed systems. It can be homemade with simple material and in several ways.Article in Italian
[ Hits: 244 | Votes: 2 | Rating: 10 ]
- Building the 6 Meter Moxon Antenna
- A moxon antenna for the 50 MHz build with 19 feet of 14 AWG copper wire, and based on a set of PVC pipes.
This is an easy to build project that will give you an efficient directional antenna on 6 meters band with low SWR on more than 1 MHz bandwidth.
[ Hits: 505 | Votes: 4 | Rating: 7.75 ]
- Coaxial Collinear Antenna for 70 CM Band
- This coaxial collinear antenna was built to test for my own consumption whether or not this antenna method actually works. the guiding principle is that we have multiple 1/4 wave elements fed in series , the radiation from each adds in phase to produce
a large vertically polarised omni-directional antenna with substantial gain
[ Hits: 565 | Votes: 3 | Rating: 6.33 ]
- The Wave Antenna for 200-Meter Reception
- A QST Article published in November 1922 is about the origin of Beverage antennas, an unidirectional antenna type that was discovered and experimented for the first time in that period. This article is the introduction to beverage antenna theory, by the homonimous autho H. H. Beverage.
[ Hits: 203 | Votes: 0 | Rating: 0 ]
- About The Beverage Antennas - Receiving Antennas
- An article about the Beverage antennas, super long wire receiving antennas thar are unidirectional and have a very low noise that makes this antenna excellent for low band dxing. By Thomas R. Sundstrom W2XQ, 73, June 1981, 73 Magazine
[ Hits: 185 | Votes: 1 | Rating: 10 ]
- A Reversible Beverage at ZL3IX
- How do two-wire reversible direction Beverages work, an excellent document that explains fundamentals of beverage antennas.
[ Hits: 515 | Votes: 0 | Rating: 0 ]
- 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: 310 | Votes: 2 | Rating: 8.5 ]
- Exploring The J-Pole Antenna
- The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
[ Hits: 142 | Votes: 0 | Rating: 0 ]
- 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: 381 | Votes: 2 | Rating: 10 ]
- Magnetic Loop for the 2m band
- Such kind of omnidirectional antenna gives the possibility to be QRV with horizontal polarisation, as commonly used for the CW and SSB section of the 2m band. This actual design shows a 1.3:1 bandwidth of about 150kHz, centered to 144.200MHz.
[ Hits: 572 | Votes: 1 | Rating: 10 ]
- 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: 961 | Votes: 7 | Rating: 8 ]
- 160 Meters 4 Square Receive Antenna
- A four square array receiving antena for the top band, performance is extremely directional and space requirements are really hard to fulfill.
[ Hits: 179 | Votes: 1 | Rating: 10 ]
- Lazy H Array Antenna for 40 meter
- Make them simple then Make them work. The LAZY H antenna is a general type of antenna that is in the curtain array family.
By placing two 1 wavelength dipoles in a plane that is at right angles to the direction of maximum radiation and keeping the proper in-phase current condition to each element, you can achieve a high gain bi-directional antenna.
[ Hits: 284 | Votes: 3 | Rating: 5.33 ]
- ARDF Sprints and Fox-oring
- About Amateur Radio Direction Finding events, sprint and Fox-Oring spcialities. Sprints are intended to bring ARDF nearer to the public and to attract potential sponsors and new athletes to ARDF. Foxoring encourages ARDF enthusiasts to improve their orienteering skills.
[ Hits: 116 | Votes: 0 | Rating: 0 ]
- Mini Satellite-Antenna Rotator Mk1
- This project is a portable device used to automatically point a directional antenna towards an orbiting satellite. It takes all the effort out of little kids holding the antenna and figuring out where to point it. It allows students to talk through Amateur Radio satellites or download weather satellite images.
[ Hits: 549 | Votes: 0 | Rating: 0 ]
- Choosing the correct Ferrite
- Common mode currents are those currents that flow in the same direction on a wire bundle, as opposed to the currents that flow
[ Hits: 250 | Votes: 0 | Rating: 0 ]
- RDF with Raspberry PI and RTL-SDR
- The RasHAWK team has used a Raspberry Pi as the basis for a networked RF sensor capable of supporting spectrum monitoring, signal intercept and direction finding (DF) operations.
[ Hits: 881 | Votes: 3 | Rating: 9 ]
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