Originally, the decibel measured the loss of voice power over one mile of telephone wire. Categories : Radio frequency antenna types. The flexible 10 meter whip is also an end-fed antenna, as is the foot long wire antenna used by some 20 meter DXers. The loading is provided by the horizontal portion of the antenna which does very iittle radiating. Adjustable tap is seen at right side of the base coil.
HF Ham Dipole Antenna Construction | 80 40 20 15 10 Metres | Electronics Notes
Back to top. In other wave bands, the generation and detection of waves is costly, complex and little-known other than by the specialists who make use of the waves. During the next decade the U. One of the first conversations we had was on antennas. An underground yard sprinkling system composed of copper pipe with soldered copper fittings may be used, provided the connecting lead from the pipes to the radio equipment is short and direct—not more than a few feet long. This capillary action is very nerve-wracking and unless you live in Phoenix, Arizona where it rarely rains , the open end of your coaxial line can suck moisture out of the air over a period of time, just as a small child sucks a cherry soda through a straw! Just make sure that the enclosed angle of your inverted vee is at least 90 degrees.