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Antennas
  • Crossed Field Antenna - The Crossed Field Antenna (CFA) is one of the applications of Correction of Maxwell's Equations which was used over 150 years ago which was proved these days that the Magnetic Field Source is only the Displacement Current not the Conduction Current . These Corrections was made by an Egyptian Doctor Engineer Fathi Kabbary , who reached the New Correct Theory which shows that the height and efficiency of the antenna doesn't depend on the wavelength
    [ Hits: 2023 | Votes: 4 | Rating: 1.00 ]
Antennas : 160M
  • Linear-Loaded Inverted V - How do you fit a full length 160 meter antenna into a 40 foot deep yard?
    [ Hits: 20979 | Votes: 7 | Rating: 4.72 ]
  • Double Extended Zepp Antenna - This double extended Zepp provides 3 db gain over a dipole on the band it is designed for. Each side or leg is about 5/8 wavelength long.
    [ Hits: 24065 | Votes: 24 | Rating: 6.13 ]
Antennas : 2M
  • 7 Elements YAGI for 144 Mhz  pop - The QM7 antenna is a simple 7 elements Yagi with 3.7 m boom length for the lower 144 MHz SSB/MGM band, in PDF Format
    [ Hits: 37135 | Votes: 31 | Rating: 5.66 ]
  • QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB. Elements
    [ Hits: 5984 | Votes: 4 | Rating: 5.25 ]
  • QM7 7 elements 144 MHz Yagi-Uda Antenna - The QM7 antenna is a simple 7 elements Yagi with 3.70 m boom length for the lower 144 MHz SSB/MGM band, used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 11.35 dBd; i.e. 13.5 dB forward gain over the isotropic radiator, while the F/R is about 12.5 dB
    [ Hits: 5036 | Votes: 13 | Rating: 5.69 ]
Antennas : 6M
  • BV6 50 Mhz Yagis - Two Yagis for six meters band, one 1 wavelength long with a gain of 9.5dBd, and the other a 2.1wl model with a gain of 11.8 dBd.
    [ Hits: 4501 | Votes: 6 | Rating: 7.50 ]
  • 50MHz-Yagis by DK7ZB - 50MHz-Yagis with a new match, all lengths from 0.6-12m
    [ Hits: 5439 | Votes: 75 | Rating: 8.31 ]
Antennas : Antenna Calculators
  • Amateur Vertical Antenna Calculator  pop - This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen.
    [ Hits: 39812 | Votes: 150 | Rating: 5.35 ]
Antennas : Beverage
  • The Benchmark Beverage - The purpose of this page is to examine the performance of a typical Beverage when all variables except length are held constant
    [ Hits: 1245 | Votes: 0 | Rating: 0.00 ]
Antennas : G5RV
  • The G5RV Antenna System Re-Visited - The original G5RV antenna system consists of a center-fed horizontal 102' wire plus a 34' length of open-wire 525-Ohm feeder. Louis Varney, the antenna system's developer, intended two other features. Learn more at Cebik website
    [ Hits: 4208 | Votes: 0 | Rating: 0.00 ]
Antennas : Homebrewing Techniques
  • Yagi Element Mounting Considerations - One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom
    [ Hits: 3823 | Votes: 0 | Rating: 0.00 ]
Antennas : Magnetic Loop
  • Thinking about Ideal Loops - Loop antennae have been used from ELF to UHF since the beginning of radiocommunications. At low frequencies, the main problem for loop antennae is to have enough sensitivity; the antenna being very small respect to the wavelength the collected energy is also small. To increase the output level the loop may be made resonant, so loosing it%u2019s intrinsic aperiodic characteristics.
    [ Hits: 1700 | Votes: 0 | Rating: 0.00 ]
Antennas : Mobile
  • Home Brew VHF UHF dual band antenna  pop - Contructing precedure and tune up of a dual band mobile antenna. This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as compared to other multi-section design.
    [ Hits: 33969 | Votes: 33 | Rating: 4.06 ]
Antennas : Moxon
  • Moxon Rectangle Calculator - Program to calculate the dimentions of a Moxon Rectangle. All equations correlated to NEC antenna modeling software for wire diameters from 1e-5 to 1e-2 wavelengths.
    [ Hits: 4879 | Votes: 19 | Rating: 5.72 ]
Antennas : Portable
  • A Portable Multi-Band Magnetic Loop Antenna  pop - Described here is a simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres, but by changing the overall length of the wire coverage of other bands is feasible
    [ Hits: 29881 | Votes: 9 | Rating: 6.11 ]
Antennas : Quad
  • Cubical Quad Antenna Design  pop - By N6VNG, can be used to determine the element lengths and the gamma match values for different frequencies, includes link to excel files with formulas to dimension your quad antenna.
    [ Hits: 28432 | Votes: 80 | Rating: 5.80 ]
Antennas : Receiving
  • How to build a tuned loop antenna  updated - How can you vastly improve your Medium Wave reception? its quite simple really, all you need is 120 foot of wire, a few lengths of timber and an old tuning capacitor with which you can build the answer to every DX'ers prayers, a tuned loop antenna.
    [ Hits: 20191 | Votes: 12 | Rating: 7.92 ]
Antennas : Shortwave
  • Long Loopstick Antenna - Wound on a 3 foot length of PVC pipe, the long loopstick antenna was an experiment to try to improve AM radio reception without using a long wire or ground.
    [ Hits: 3828 | Votes: 1 | Rating: 10.00 ]
Antennas : Theory
  • Interference Cancelling System - The use of interference signal cancellation has been around for some time. The idea is to use an auxiliary antenna almost any random length of wire in addition to the main receiving antenna
    [ Hits: 1615 | Votes: 1 | Rating: 3.00 ]
Antennas : Wire
  • Random length wire antennas - Random Length Wire Antennas by WIPL
    [ Hits: 522 | Votes: 2 | Rating: 5.50 ]
  • LF/VLF Portable Loop Antenna - The octoloop antenna is a length of 25 pair telephone wire inside an octagonal loop shield of 3/4 hard copper pipe
    [ Hits: 3377 | Votes: 11 | Rating: 5.08 ]
Propagation : Observatories
  • Dominion Radio Astrophysical Observatory - operates the seven-antenna Synthesis Telescope (ST), the 26-meter Telescope, and the 10-cm Solar Flux Monitor. It is a member of the Canadian Galactic Plane Survey , a project to map 60 degrees of the Galactic plane at numerous wavelengths with a uniform sensitivity.
    [ Hits: 395 | Votes: 1 | Rating: 1.00 ]
Propagation : Resources
  • Shortwave Propagation - Description of shortwave propagation on shortwaves, refers to those wavelengths which occur with frequencies from about 3 to 30 mHz, or 100 to 10 meters
    [ Hits: 1223 | Votes: 2 | Rating: 8.00 ]
Shopping and Services : Regional : USA
  • Wavelength USA - Hamsticks, mobile and base antennas
    [ Hits: 1184 | Votes: 2 | Rating: 6.50 ]
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