MICROWAVE COMMUNICATION QUIZ

What ferrite device can be used instead of duplexer of isolate microwave transmitter and receiver when both are connected to the same antenna?

Isolator

Circulator

Simplex

Magnetron

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In microwave transmission using digital radio, what causes most intersymbol interference?

Rayleigh fading

Slow fading

Delayed spreading

Random Doppler shift

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The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Distributed lead inductance

Inter-electrode capacitance

Degree of emission from the cathode

Electron transit time

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A PPI cathode-ray tube as used on a radar set

Is used for receiver alignment

Indicates both the range and azimuth of a target

Indicates only the range of a target

Is used to check the percentage of modulation

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Which of the reception problems below that is not due to multipath?

Random Doppler shift

Rayleigh fading

Delayed spreading

Slow fading

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It is possible to increase the maximum range of a radar equipment by

Lowering the pulse frequency

Raising the peak power of the transmitter

Narrowing the beam width and increasing the pulse duration

All of these

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Which of the following operating frequencies is used for the modern loran navigational system?

Loran D: 10.2 kHz

Loran C: 100 kHz

Loran B: 900 kHz

Loran A: 1950 kHz

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What do you call an attenuation that occurs over many different wavelengths of the carrier?

Slow fading

Rician fading

Rayleigh fading

Wavelength fading

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The Gunn diode oscillator

Operates over a positive resistance characteristic

Depends on the formation of charge domain

Is capable of generating continuous microwave power of the order of kilowatt

Generates frequencies which are below 100 MHz

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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 = λR/L

S = 2λR/L

S = 3λR/L

S = λR/RL

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