antennas and feedlines Flashcards
horizontallh polarized antenna
dipole mounted so the connductor is parallel to the earths surface
direction that radiation is strongest from a half wave dipole antenna in free space
beroadside to the antenna
length of a dipole
wavelength = 300/frequence 95% of this
how to make an antena resonate on a higher frequency
shorten it
approximate length of a 6 meter dipole antenna
112 inches
orientation of electric field
perpendicular to earth
length of a wuarter wavelength vertical antenna
19 inches
loading
shortening an antenna, inserting an inductor in he radiating portion of teh antenna to make iit electrically longer
beam antenna
antenna that concentrates signals in one direction
rubber duck antenna disadvantage
does not transit or receive as effectively as full sized antennas
advantages of a roof mounted antenna
procicdes most unifor aradiationn pattern
why use a properly mounted 5/8 wavelength antenna
lower angle of radiation and more gain than a 1/4 antenna, improved coverage