21. What do you call an attenuation that occurs over many different wavelengths of the carrier?
22. Microwave frequencies are normally regarded as those in the range of
23. Which of the following is used as an oscillator device in the SHF band?
24. Which of the following is used as a high power microwave oscillator?
25. __________ is the progressive decrease of signal strength with increasing distance.
26. A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is
27. If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers
28. The frequency of the oscillation generated by a magnetron, is mainly determined by
29. When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.
30. The coarse frequency adjustment of a reflex klystron is accomplished by
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