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VK3IL - Multiband end-fed 80-10m antenna - NEC2 model file of a "MyAntennas EFHW-8010" multi-band antenna. Other retail books (such as The ARRL Antenna Book, Marcel De Canck's Advanced Antenna Modeling, and others) also include antenna model files. Most free or retail NEC software packages include an 'example' folder containing antenna model files.
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of Hartford, Connecticut .
William Ittner Orr (1919–2001) was an engineer, educator, communicator, and ham radio operator. [1] [2] [3] He was the American author of numerous amateur radio and radio engineering texts.
The founding editor was Paul Rinaldo, W4RI, who also contributed many technical articles to the ARRL membership journal, QST. In January, 2000, the American Radio Relay League purchased a competing publication, Communications Quarterly from CQ Communications, Inc. (who also publish the CQ Amateur Radio magazine), and merged the contents into QEX .
— Online calculator that solves the "Basic equations for a small loop" using formulas from The ARRL Antenna Book, 15th ed. "An overview of the Underestimated Magnetic Loop HF Antenna" (PDF). Magnetic loop antennas. www.nonstopsystems.com — Extensive Paper by Leigh Turner VK5KLT (SK) on HF Magnetic Loop Antennas.
Original file (1,275 × 1,650 pixels, file size: 497 KB, MIME type: application/pdf, 73 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
Antenna directivity is the ratio of maximum radiation intensity (power per unit surface) radiated by the antenna in the maximum direction divided by the intensity radiated by a hypothetical isotropic antenna radiating the same total power as that antenna. For example, a hypothetical antenna which had a radiated pattern of a hemisphere (1/2 ...
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