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Microwave Communication
In a radar-set receiver, the usual mixer stage is
And FET
A Rochelle salts crystal
A silicon crystal
A tunnel diode
And FET
A Rochelle salts crystal
A silicon crystal
A tunnel diode
Answer
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Microwave Communication
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
Low-pass filters
The shortest possible time
A long time constant
The restricted high-frequency response
Low-pass filters
The shortest possible time
A long time constant
The restricted high-frequency response
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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Microwave Communication
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
Must remain as before
Must be increased
Must be doubled
May be decreased
Must remain as before
Must be increased
Must be doubled
May be decreased
Answer
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Microwave Communication
Which of the following is used as an oscillator device in the SHF band?
Both B and C
Thyratron tube
Klystron tube
Tunnel diode
Both B and C
Thyratron tube
Klystron tube
Tunnel diode
Answer
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Microwave Communication
Which causes multipath or frequency selective fading?
Nearer reflector
Small reflector
Further reflector
Large reflector
Nearer reflector
Small reflector
Further reflector
Large reflector
Answer
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