Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?
Use a GPS signal reference
Use a rubidium stabilized reference oscillator
Use a temperature-controlled high Q dielectric resonator
All these choices are correct✓الإجابة الصحيحة
الشرح
Microwave work needs stability far better than an ordinary crystal oscillator provides, and all three techniques listed deliver it: disciplining an oscillator to GPS, using a rubidium standard, and using a temperature-controlled high-Q dielectric resonator.