CET Communication Systems & RF 3

Question 1

What is the impedance of a standard coaxial cable commonly used in RF systems?

Accepted Answer

50 ohms

Answer

50-ohm coaxial cable is the standard for RF and microwave systems, balancing power handling and signal loss.

Question 2

What type of antenna radiates equally in all horizontal directions?

Accepted Answer

Omnidirectional antenna

Answer

An omnidirectional antenna radiates and receives signals equally in all horizontal directions, making it ideal for general coverage.

Question 3

What does the decibel (dB) measure in RF systems?

Accepted Answer

A logarithmic ratio between two power levels

Answer

The decibel expresses the ratio between two power levels on a logarithmic scale, making it easier to describe large gain or loss values.

Question 4

In a PLL (Phase-Locked Loop) frequency synthesizer, what component compares the reference and feedback frequencies?

Accepted Answer

Phase detector

Answer

The phase detector compares the reference oscillator frequency with the divided VCO output to generate an error signal for frequency correction.

Question 5

Which multiplexing method assigns each user a dedicated time slot in a shared channel?

Accepted Answer

TDMA

Answer

Time Division Multiple Access (TDMA) assigns each user a specific time slot within a repeating frame, allowing multiple users to share the same frequency.

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CET Communication Systems & RF 3