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A HB9XBG Full Size Vertical Antenna for the 40m-band on Simplon Pass with view to Mount Fletschhorn. The 40-meter or 7-MHz band is an amateur radio frequency band, spanning 7.000-7.300 MHz in ITU Region 2, and 7.000-7.200 MHz in Regions 1 & 3. It is allocated to radio amateurs worldwide on a primary basis; however, only 7.000-7.200 MHz is ...
Typical feeder loops are 1 / 8 to 1 / 5 the size of the antenna's main loop, which gives transform ratios of 64:1 to 25:1, respectively. Adjusting the proximity and angle of the feeder loop to the main loop, and distorting the feeder's shape, both make small-to-moderate changes to the transform ratio, and allows for fine ...
Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]
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Electrical length is widely used with a graphical aid called the Smith chart to solve transmission line calculations. A Smith chart has a scale around the circumference of the circular chart graduated in wavelengths and degrees, which represents the electrical length of the transmission line from the point of measurement to the source or load.
Although also a resonant antenna, the halo antenna is distinct from the full-wave loop antenna, which is almost exactly double its size for the same operating frequency. In the case of the halo antenna, each half is about a quarter wavelength long and ends with a current node (zero current and peak voltage) at the break.
40 meters – wingspan of the Mil Mi-26, the largest helicopter; 40 meters – average depth beneath the seabed of the Channel tunnel; 49 meters – wavelength of the broadcast radio shortwave band at 6.1 MHz; 50 meters – length of a road train; 50 meters – height of the Arc de Triomphe; 55 meters – height of the Leaning Tower of Pisa
Orr (1996) [13] shows a 10, 15, and 20 meter, 2 element quad with boom length of 6′10″. Internally stackable Interaction between antennas of a multiband quad are quite low, even when fed with a single feed line, [ 14 ] so higher frequency (smaller) quad loops can be nested in lower frequency (bigger) quad loops, allowing operation on as ...