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Microwave Communication
The frequency of the oscillation generated by a magnetron, is mainly determined by
The flux density of the external magnet
The dimension of each cavity resonator
The number of the cavity resonators
The ratio of the dc cathode voltage to the magnetic flux density
The flux density of the external magnet
The dimension of each cavity resonator
The number of the cavity resonators
The ratio of the dc cathode voltage to the magnetic flux density
Answer
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Microwave Communication
In a pulsed radar set, the STC circuit is used to
Reduce interference from the effects of sea return
Improve the target bearing resolution
Vary the pulse frequency in order to control the maximum target
Increases receiver sensitivity for echoes from targets
Reduce interference from the effects of sea return
Improve the target bearing resolution
Vary the pulse frequency in order to control the maximum target
Increases receiver sensitivity for echoes from targets
Answer
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Microwave Communication
Microwave frequencies are normally regarded as those in the range of
1 to 500 MHz
10 to 1000 GHz
1 to 100 GHz
1000 to 10,000 GHz
1 to 500 MHz
10 to 1000 GHz
1 to 100 GHz
1000 to 10,000 GHz
Answer
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Microwave Communication
A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the
Output power would increase
The frequency will decrease
Oscillation will cease
Bunching would occur earlier in time
Output power would increase
The frequency will decrease
Oscillation will cease
Bunching would occur earlier in time
Answer
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Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of
The effect of an external magnetic field
The energy liberated form the collector
The energy contained the cavity resonators
The absorption of energy by the signal from an electron stream
The effect of an external magnetic field
The energy liberated form the collector
The energy contained the cavity resonators
The absorption of energy by the signal from an electron stream
Answer
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Microwave Communication
The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)
S = 3λR/L
S = 2λR/L
S = λR/RL
S = λR/L
S = 3λR/L
S = 2λR/L
S = λR/RL
S = λR/L
Answer
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