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Description of Simple Systems
Sensitivity Noise and Bandwidth
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absorption curve absorption signal adjusted air gap amplifying chain amplitude attenuator band bandwidth bar magnet capacitor coils coupling crystal detector cycle per second d.c. field d.c. magnetic field detected e.s.r. equipment e.s.r. spectrometer e.s.r. system electrical electron spin resonance field H field strength free radical gauss guide wall H field head amplifier hybrid ring kc/s klystron klystron oscillator klystron valve low frequency modulation magnetic field matched maximum Mc/s measured meter microgrammes microwave system modulation frequency molecule noise factor occurs oscilloscope output pentode phase sensitive detector pole faces pole pieces possible probe produce Q factor quency r.f. energy r.f. field radio frequency radio frequency energy reduced reference signal reflector voltage resistor resonant cavity sample selective amplifier shown in Fig spectroscopy stage standing wave ratio substance super high frequency superheterodyne triode tube tuned circuit unpaired electron voltage volts waveguide wavelength whilst width X band