INDEX-1 MODULE 10  INDEX A Absorption in the ionosphere, 2-24 Absorption of light, 1-31 Acoustics, sound waves, 1-23 Amplitude, wave motion, 1-7 Antennas, 4-1 antenna characteristics, 4-8 array antennas, 4-25 operation of basic antennas, 4-18 principles of antenna radiation, 4-2 radiation of electromagnetic energy, 4-6 rf safety precautions, 4-47 special antennas, 4-40 Atmospheric propagation, 2-11 diffraction, 2-13 reflection, 2-11 refraction, 2-12 B Basic antennas, operation of, 4-18 Broadside arrays, 4-31 Bums, if, 4-50 C Characteristic impedance of a transmission line, 3-14 Collinear array, 4-29 Color and frequencies, 1-27 Color and light, 1-28 Comparison of light waves and sound waves, 1-32 Corner reflector, 4-46 Current and voltage distribution on an antenna, 4-4 Cycle, wave motion, 1-8 D Density and velocity of transmission, sound waves, 1-22 Determining characteristic impedance, 3-26 Dielectric heating, 4-49 Diffraction, atmospheric propagation, 2-13 Diffraction, wave motion, 1-16 Diffusion of light, 1-31 Directivity, 4-28 Distributed constants, 3-11 Doppler effect, wave motion, 1-16 E Echo, acoustics, 1-23 Electromagnetic fields, 2-2 induction field, 2-2 radiation fields, 2-4 Electromagnetic fields about a transmission line, 3-13 Electromagnetic interference (EMI), 2-28 control of EMI, 2-29 man-made, 2-28 natural, 2-29 Electromagnetic spectrum, 1-33 Electromagnetic theory of light, 1-26 Electromagnetic waves, 1-33 basic antenna, 1-34 components, 1-35 End-fire array, 4-33 F Fading, radio wave propagation, 2-26 multipath, 2-26 selective, 2-27 Folded dipole, 4-24 Frequency and time, wave motion, 1-9 Frequency selection considerations, radio waves, 2-32 lowest usable frequency, 2-32 maximum usable frequency, 2-32 optimum working frequency, 2-33 G Gain, antenna, 4-9 Glossary, AI-l to AI-11