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Electronics and Communication Control Systems Difficulty: Medium

Simplification of the function $${\text{f}} = \overline {{\text{AB}}} + \overline {\overline {\text{A}} + {\text{B}}} $$ is: If the reflection coefficient is $$\frac{1}{5}$$, what is the corresponding VSWR? For a given sample-and-hold circuit, if the value of the hold capacitor is increased, then How many voice channels are supported for each 30 KHz radio channel in IS-136? Relationship between Doppler frequency shifts of two radars A and B having 0.1 foot and 0.05 foot wave-lengths, approaching the target at 1000 feet per second and 2000 feet per second rate, respectively, will be