, 195 Automatic volume control, 133 AMPS, 248 AVC, 133 Analogue cell system, 262 Analogue to digital converter, 162 Angle of radiation, 37, 83 Balanced feeder, 92 Antenna: Bandwidth (of FM signal), 61 active, 114 Bandwidth antenna, 76, 82 bandwidth, 76, 82 Bandwidth filter, 166-168 beamwidth, 81 Base station, 258 dipole, 95-98 controller, 261, 264 discone, 104 subsystem, 264 end fed wire, 99 transceiver sub-system, 264 ferrite rod, 112 BBC, 12 folded dipole, 97 Beamwidth antenna, 81 292 Index Beat frequency oscillator, 53, 152 Crystal mixer oscillator, 180 Bell, Alexander Graham, 5 Crystal set, 120 BFO, 53, 152 CTCSS, 239 Blackout radio, 43 Blocking, 177 Bluetooth, 282, 283-285 D layer, 31, 32 Broadcast bands short wave, 206 DAB, 215-220 Broadcast bands tropical, 206 DBS, 234 Broadcasting AM, 204-207 DDS, 141-144 Broadcasting digital, 215-220 De Forest, 9 Broadcasting RDS, 211-215 De Magnete, 3 Broadcasting short wave bands, Dead zone, 41 204-207 De-emphasis, 61, 207 Broadcasting VHF FM, 207 Demodulation: BSC, 261, 264 FM, 153-162 BSS, 264 synchronous AM, 152 BTS, 264 Demodulator, 151-162 Butterworth filter, 190 AM, 53, 152 coincidence, 159-161 Foster-Seeley, 158 Capture effect, 156 Morse, 152 Carrier, 51 phase locked loop FM, 161 Carrier insertion oscillator, 152 quadrature, 159 Cat's whisker, 10 ratio, 157 CDMA, 15, 72-75, 249 slope, 156 CDMA2000, 249, 273-275 SSB, 152 cdmaOne, 15, 249, 269-273 Detector, AM, 53 Cell, 254 Deviation, 58 Cell breathing, 279 Deviation ratio, 60 Ceramic filter, 150, 165 Diffraction (of radio waves), 26-28 Chip code, 73 Digital broadcasting, 215-220 CIO, 152 Digital signal processing, 162 Clarke, Arthur C., 14, 221 Digital to analogue converter, 143, Class A amplifier, 183 Class B amplifier, 183 Diode detector, 53 Class C amplifier, 184 Diode ring mixer, 144 Coaxial feeder, 90 Diode valve, 8 Coded orthogonal frequency Dipole antenna, 95-98 division multiplex, 75 Dipole, folded, 97 COFDM, 75 Direct broadcast satellite, 234 Coincidence demodulator, 159-161 Direct conversion receiver, 1