Antenna Toolkit, Second Edition by Joseph Carr, Joe Carr

By Joseph Carr, Joe Carr

Joe Carr has supplied radio amateurs and short-wave listeners with the definitive layout consultant for sending and receiving radio signs with Antenna Toolkit second edition.

Together with the robust suite of CD software program, the reader may have a whole resolution for developing or utilizing an antenna - bar the particular undefined! The software program offers an easy Windows-based reduction to undertaking the layout calculations on the middle of winning antenna layout. the entire consumer must do is decide upon the antenna style and set the frequency - a way more enjoyable and no more blunders providers procedure than utilizing a traditional calculator to unravel formulae.

the hot variation has been revised to incorporate additional instances of propagation, extra antennas and in addition new chapters - Small Loop Antennas (a subject of substantial curiosity, which has been the topic of a lot fresh debate within the novice radio press); and Yagi Beam Antennas (widely used at HF and VHF). The CD software program has additionally been updated.

Joe Carr's services within the region of antenna layout is famous. Antenna designers, no matter if hobbyist or technician, might be guaranteed they want glance no additional than Antenna Toolkit for the full consultant to realizing the practicalities of utilizing and designing antennas at the present time.

A whole resolution for antenna layout in a single package.

Includes loose CD-ROM with cutting-edge software program for all layout calculations.

The definitive consultant to antenna layout for radio amateurs and short-wave listeners.

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Sample text

The signal radiates outward from it in a spherical pattern. At some distance R we can examine the surface of the sphere. The entire output power of the transmitter is uniformly distributed over the entire surface of the sphere. But if the antenna is directive, then all of the power is focussed onto a small area of the sphere with a vertical angle of V and a horizontal area of H . The same amount of energy exists, but now it is focussed onto a smaller area, which makes it appear as if the actual power level was a lot higher in that direction.

For amateur radio operators, one concern is the current-carrying capacity. 2 52 ANTENNA TOOLKIT although those tempted to use smaller diameters with the higher legally permitted powers are forewarned: it is not such a good idea. Both short-wave listeners and amateur radio operators need to be aware of another problem with the wire: the length to diameter ratio, or as it is sometimes specified, the signal-wavelength-to-wire-diameter ratio, determines the velocity factor (VF) of the conductor. e. wire) compared with the velocity in free space (which is c, the speed of light).

Wavelength and frequency are related to each other. The wavelength is the reciprocal of frequency, and vice versa, through the velocity constant. In free space, the velocity constant is the speed of light (c), or about 300 000 000 m/s. This is the reason why you often see ‘300’ or its submultiples (150 and 75) in equations. When the frequency is specified in megahertz, then 300 000 000 becomes 300 for one wavelength. The half-wavelength constant is 150, and the quarter-wavelength constant is 75.

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