rial design, 25/3-4 Space diversity, Organisations), 22/6 formal design methods, 25/5, 25/7-8 fading combating, 9/6, 9/13, 50/6-7 SIR (Speaker Independent Recognition), high level languages, PCN base stations, 48/10 voice, 37/8 Ada, 25/13 Space shuttle, 51/5 Skew of a deviation, 1/5 C++, 25/14 Space wave propagation, troposphere, Skin effect, 15/4 Chill, 25/13 Skip zone, H.F. transmissions, 27/8-9 Pascal, 25/12 Space waves, 6/7 Sky noise temperature, absorption effects, integration, 25/4 atmospheric absorption, 6/18 knowledge based system design, 25/7, building and tree attenuation, 6/17 Sky waves, 6/7 25/9-10 clutter loss, 6/17-18 critical frequency, 6/21 language generations, 25/12 cylindrical surface approximation, 6/16 field strength prediction, 6/21-2 lifecycle stages, 25/3-5 diffraction over a sea path, 6/16 gyrofrequency, 6/20 maintenance and enhancements, 25/5 free space field strength, 6/13-14 H.F. propagation, 27/6-10 object oriented design, 25/7, 25/9 free space path loss, 6/14 ionosphere attenuation, 6/20 PABXs, 34/11-14 ground reflections, 6/17 ionosphere cross modulation, 6/21 performance, 25/12 hill attenuation, 6/15-17 ionosphere refractive index, 6/21 proof testing, 25/16 hydrometeors depolisation, 6/18-20 ionosphere structure, 6/20 quality and reliability, 25/19 knife edge diffraction, 6/14-15 polarisation coupling loss, 6/20-1 rapid prototyping, 25/10-11 sky noise temperature, 6/18 reflection and refraction, 6/20 requirements capture and analysis, 25/3 surface diffraction, 6/15 skip distance, 6/21, 27/8-9 simulation, 25/11-12 tropospheric refractive index, 6/17-18 Index/21 see also Electromagnetic waves; Standard deviation, 1/4 EIA, 22/25 Radiowave propagation Standard error of estimation, 1/6, 1/9 FCC (USA), 22/24-5 Spacecraft technology, 51/5-10 Standard metal test finger, 23/5 ICA, 22/26 see also Satellites Standard time signals, 9/6 IEEE, 22/25-6 SPAG (Standards Promotion and Standardised normal curve, 1/7-8 NIST (USA), 22/24 Application Group), 22/22 Standards, SCC (Canadian), 22/26 OSI, 1