INDEX-1 MODULE 18  INDEX A A-scope, 3-2 Acquisition (mode), 1-37 Airborne radar, 1-38 Airborne radar antennas, 3-20 to 3-21 Air control panel, 4-17 Altitude, 1-12 Ambiguous returns, 1-6 to 1-7 Amplitron, 2-17 Antennas, broadside arrays, 3-19 directivity, 3-15 horn radiators, 3-19 parabolic reflectors, 3-16 to 3-18 power gain, 3-15 reflectors, 3-16 to 3-19 Antenna beam width, 1-14, 3-15 Antenna system, 1-20 Antijamming circuits, 2-41 Artificial transmission line, 2-10 to 2-11 Asymmetrical multivibrator, 2-5 ATR, 2-23 to 2-26 Automatic gain control (AGC), 2-40 Average power, 1-7, 4-8 to 4-9 Azimuth, 1-3 B Balanced mixer, 2-34 to 2-37 Bearing, 1-11 to 1-12 relative, 1-11 true, 1-3, 1-11 Bearing resolution, 1-14 Beat frequency, 1-27 Blip, o’scope, 3-3 Blocking, 2-31 Broadside array, 3-19 C Carrier-control approach (CCA), 1-38 Carrier frequency, 1-5, 4-2 Clutter, 2-42 Coherence, 1-29 Coherent oscillator, 2-18 Conical scanning, 1-21 Continuous-wave (cw) transmission, 1-25 Cooling systems, 4-19 to 4-21 Crossed-field amplifier, 2-17 to 2-20 D Deflection coils, 3-7 to 3-8 Dehydrators, 4-18 to 4-19 Deionization time, 2-22, 4-13 Designation (mode), 1-37 Detectors, 2-32, 2-38 Difference frequency, 1-27 Directional antenna, 3-15 Directivity, 3-15 Discriminator, 2-33 Doppler effect, 1-25 to 1-27 Dry-air systems, 4-16 to 4-19 Ducting, 1-17 Duplexers, 2-20 to 2-30 Duty cycle, 1-8 to 1-9 E Echo, 1-2 Echo box, 4-5 to 4-8 Electronic counter-counter measures (ECCM), 2-40 to 2-41 Electrical power, 4-15 to 4-16 Elevation angle, 1-3 F Fast-time-constant (FTC), 2-41 Feedhorns, 3-20 Frequency modulation, 1-27 Frequency spectrum, 4-2 to 4-5 Frequency synthesizer, 2-18 G Gated AGC, 2-41 Glow discharge, 2-22 Ground-controlled approach (GCA), 1-38 Guidance radar, 1-37