21 SWEEP GENERATORS, OSCILLATORS, LOGARITHMIC AMPLIFIER DETECTORS, AMPLIFIERS, LOWPASS FILTERS, BANDPASS FILTERS, TUNABLE BANDPASS FILETERS, IMPEDANCE COMPARATORS, COAXIAL TERMINATIONS, COAXIAL MISMATCHES, ATTENUATORS, DETEC TORS FOR PROVIDING A DC OUTPUT VOLTAGE PROPORTIONAL TO THE INPUT RF ENERGY AND IMPEDANCE TRANSFORMERS