MICROWAVE COMMUNICATION QUIZ

Klystron oscillators are most often used in the frequency range of

10 to 10000 MHz

3000 to 30000 MHz

30 to 30000 MHz

300 to 3000 MHz

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

Slow fading

Delayed spreading

Rayleigh fading

Random Doppler shift

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Which of the following is used as a high power microwave oscillator?

Reflex-klystron

Klystron

Thyratron

Magnetron

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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

The restricted high-frequency response

The shortest possible time

A long time constant

Low-pass filters

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Coupling into and out of a traveling-wave tube can be accompanied by a

All of these

Direct coax-helix match

Cavity match

Waveguide match

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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 = 3λR/L

S = λR/L

S = λR/RL

S = 2λR/L

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

Slow fading

Rayleigh fading

Rician fading

Wavelength fading

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As the electron beam moves through a klystron’s intercavity drift space

Frequency modulation at the input cavity creates velocity modulation at the output cavity

Phase modulation at the input cavity creates velocity modulation at the output cavity.

Density modulation at the input cavity creates velocity modulation at the output cavity

Velocity modulation at the input cavity creates density modulation at the output cavity

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If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the

π mode

2π mode

π/2 mode

π/4 mode

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At what position is the input signal inserted into a traveling-wave tube?

At the collector

At the control grid of the electron gun

At the collector end of the helix

At the cathode end of the helix

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