10 Questions
What is the approximate bandwidth of the baseband signal mentioned in the text?
10 kHz
What is the calculated value of Q for the given example in the text?
45.5
What is the formula given in the text to calculate the Q factor of a tuned circuit?
$Q = \frac{f_c}{Bandwidth}$
Why is it easier to design a tuned circuit for the calculated Q value of 45.5?
It is a fixed and practical value of Q, making it easier to design.
What is the Q factor required for a tuned circuit with a bandwidth of 10 kHz at the lower edge of the broadcasting medium wave (550 kHz)?
55
What is the main reason for the poor selectivity of a TRF (Tuned Radio Frequency) receiver?
The Q factor requirement of the tuned circuits is not fixed.
What is the Q factor required for a tuned circuit with a bandwidth of 10 kHz at the higher edge of the medium wave (1650 kHz)?
165
What is the approximate Q factor required for a tuned circuit at the upper side of the short wave (around 20 MHz)?
2000
Why is it difficult to achieve the variation in Q factor required for different carrier frequencies in a TRF receiver?
The variation in Q is difficult to achieve in practice.
Is it possible to achieve a Q factor of 2000 with ordinary tuned circuits?
No, it is impossible.
Test your knowledge on how receivers select desired carrier frequencies and reject others based on resonance curve sharpness. Explore the concept of sensitivity in detecting weak signals. Improve your understanding of receiver capabilities.
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