Wave Antenna
Found 8 free book(s)
End Fed Half Wave MultiBand Antennas - W7YRC
hamfest.w7yrc.orgwa7ark 3 What is an End Fed Half Wave Antenna? Let's call it a “EFHW” Works on a similar principle to a Zepp and J-Pole ~0.5 Wave-Length wire on lowest band (130ft on 80m, 67ft on 40m) Fed from one end using a transformer in a box
Constructing a Simple 5/8 Wavelength Vertical Antenna for ...
www.arrl.org"5/8-Wavelength Vertical Antenna for Pentecost, Mobile Work," Ham Radio, May 1976. Radio sales, P. O. Box 1105, 1016 E. Eureka St.. Lima OH 45802, GOI-51048 telescoping whip antenna. Band The Shooter — A 3- Portable Antenna in a jiffy? Try Want a vertical you can put up or take down this penny-pincher's Field Day special!
Homebrew AS-2259/GR NVIS Antenna By N3OC - Fracassi
www.fracassi.netHomebrew AS-2259/GR NVIS Antenna By N3OC The AS-2259/GR is an NVIS (near vertical incident skywave) military antenna for short to medium range communications on the lower HF bands. It has been made over the years by several manufacturers, and when available, they are usually somewhat expensive. This is pretty much the same antenna as the
Antennas & Projects 20 - QSL.net
www.qsl.neta half-wave antenna there is a voltage minimum (node) at the center. The voltage is not zero at its node because of the resistance of the antenna, which consists of both the RF resistance of the wire (ohmic loss resistance) and the radiation resistance. The radiation resistance is the equivalent resistance that would
ELECTROMAGNETIC WAVE THEORY - Purdue University
engineering.purdue.edution and antenna theory in Chapter 5. Chapter 6 then elaborates on the various theorems and limiting cases of Maxwell’s theory important to the study of electromagnetic wave behavior. Scattering by spheres, cylinders, rough surfaces, and volume inhomogeneities are treated in Chapter 7. In Chapter 8, we present Maxwell’s theory from the point
CHAPTER 3 ANTENNA ARRAYS AND BEAMFORMING
vtechworks.lib.vt.eduANTENNA ARRAYS AND BEAMFORMING Array beam forming techniques exist that can yield multiple, simultaneously available beams. The beams can be made to have high gain and low sidelobes, or ... the phase of the received plane wave at the nth element is …
Antenna Height and Communications Effectiveness
www.arrl.organgle, meaning that an antenna must be placed high above the ground in terms of the wavelength of the radio wave being transmitted. A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet, all other factors being equal. A height of 120 feet
Antenna Patterns and Their Meaning - Industrial Networking
www.industrialnetworking.comAn antenna is a transducer between a guided wave and a radiated wave, or vice versa. The structure that “guides” the energy to the antenna is most evident as a …