By Joseph Carr, Joe Carr
It hasn't ever been more uncomplicated to transmit and bought radio indications than through the use of this booklet, that is geared toward rookies and complex clients alike. Elektor Electronics» Product Description: Joe Carr has supplied radio amateurs and short-wave listeners with the definitive layout consultant for sending and receiving radio indications with Antenna Toolkit 2d editio including the robust suite of CD software program, the reader can have an entire answer for developing or utilizing an antenna - bar the particular undefined! The software program presents an easy Windows-based reduction to conducting the layout calculations on the middle of profitable antenna layout. all of the person must do is pick out the antenna variety and set the frequency - a way more enjoyable and not more mistakes providers strategy than utilizing a standard calculator to resolve formulae. the recent variation has been revised to incorporate additional instances of propagation, extra antennas and likewise 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 up-to-date. Joe Carrs services within the region of antenna layout is known. Antenna designers, no matter if hobbyist or technician, may be guaranteed they want glance no additional than Antenna Toolkit for the total advisor to realizing the practicalities of utilizing and designing antennas this present day.
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Additional resources for Antenna Toolkit, 2 edition
In other words, build the antenna installation like a brick outhouse. Both of these mechanical integrity issues become extremely important if a problem develops. For example, suppose a wind or snow storm wrecks the antenna, plus a part of your house. The insurance company will not pay out (in most cases) if your local government requires inspections and you failed to get them done. Make sure the mechanical and/or electrical inspector (as required by US law) leaves a certiﬁcate or receipt proving that the ﬁnal inspection was done.
Every year we read sad news in the magazines of a colleague being electrocuted while installing, or working on, an antenna. In all of these tragic cases, the antenna somehow came into contact with the electrical power lines. Keep in mind one dictum and make it an absolute: There is never a time or situation when it is safe to let an antenna contact the electrical power lines! None. Ever. BELIEVE THIS NO MATTER WHAT ANYONE SAYS TO THE CONTRARY. This advice includes dipoles and long wires ‘thrown over’ supposedly insulated power mains lines, as well as antennas built from aluminum tubing.
15F is the horizontal or azimuthal extent. 15F make a rather bold and unwarranted assumption: the antenna is perfect and is installed somewhere in free space. Since most antennas are not in the zone midway between the Earth and Mars, one has to account for the effects of being close to the Earth’s surface. 16 shows the approximate patterns for horizontally polarized half-wavelength dipoles close to the ground. 16 we see the azimuthal pattern. It is the ﬁgure ‘8,’ but is pinched a bit. Notice that the maxima are perpendicular to the wire, and the minima (or ‘nulls’) are off the ends.
Antenna Toolkit, 2 edition by Joseph Carr, Joe Carr