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Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.
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]
A Yagi–Uda antenna, or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array; [1] these elements are most often metal rods (or discs) acting as half-wave dipoles. [2]
The Homebrew Computer Club was an informal group of electronic enthusiasts and technically minded hobbyists who gathered to trade parts, circuits, and information pertaining to DIY construction of personal computing devices. [3] [self-published source] It was started by Gordon French and Fred Moore who met at the Community Computer Center in ...
As with the Moxon antenna, the design omits the directors found in a Yagi-Uda. Its antenna gain is between 5dBi and 6dBi, the forward/reverse attenuation is up to 20 dB. The hexbeam consists of six arms of non-conductive materials such as fiberglass or plastic pipes, and insulated metallic wire is used to form the elements.
However, a Yagi with the same number of elements as a log-periodic would have far higher gain, as all of those elements are improving the gain of a single driven element. In its use as a television antenna, it was common to combine a log-periodic design for VHF with a Yagi for UHF, with both halves being roughly equal in size.
The 70-centimeter or 440 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio and amateur satellite use. The ITU amateur radio allocation is from 430 to 440 MHz; however, some countries, such as the United States, allocate hams 420 to 450 MHz.
cm testex5 cm 12 element log periodic antenna in free space cm 78 segments. sigma=o/l receiving and trans. patterns. cm dipole length to diameter ratio=150. ce tau=0.93. sigma=0.70. boom impedance=50. ohms.