Extra Class

What is added to an FM speech channel to boost the higher audio frequencies?

Why is de-emphasis used in FM communications receivers?

What is meant by the term “baseband” in radio communications?

What are the principal frequencies that appear at the output of a mixer?

What occurs when the input signal levels to a mixer are too high?

How does a diode envelope detector function?

Which type of detector is used for demodulating SSB signals?

What is meant by “direct sampling” in software defined radios?

What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?

What type of digital signal processing filter is used to generate an SSB signal?

Which method generates an SSB signal using digital signal processing?

How frequently must an analog signal be sampled to be accurately reproduced?

What is the minimum number of bits required to sample a signal with a range of 1 volt at a resolution of 1 millivolt?

What function is performed by a Fast Fourier Transform?

What is the function of decimation?

Why is an anti-aliasing filter required in a decimator?

What aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a direct-sampling software defined radio (SDR)?

What sets the minimum detectable signal level for a direct-sampling software defined receiver in the absence of atmospheric or thermal noise?

Which of the following is generally true of Finite Impulse Response (FIR) filters?

What is the function of taps in a digital signal processing filter?