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The propagation of electromagnetic waves
Some basic concepts of electrical theory
The principles of electromagnetic distance measurement
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8f and 9f accuracy accurate aerial amplifier amplitude modulation applied voltage beam beat frequency calibration carrier frequency carrier signal carrier wave Cavity resonators Chapter coil components constant crystal current flow cycle Decca delay line diagram digits dipole direct EDM instruments effect electronic equation equipment error factor frequency modulation Geodimeter ground swing group velocity half-wavelength Hence heterodyne illustrated in Fig infra-red instantaneous phase Kerr cell klystron km/s lane identification lane width master instrument measurement process modulation frequency modulation signal null meter obtained optical oscillator output pattern frequency phase angle phase difference phase discriminator circuit phase lag phase measurement phase shift phase value possible produced propagation pulse radiation reactance reading readout received reference signal reflected signal reflector refractive index remote instrument rotate rotor shown in Fig slave station surface surveying Tellurometer MRA temperature transmitted vector velocity visible light voltage water vapour wavelength zero