A superheterodyne receiver is designed to receive signals with carrier frequencies between 4 MHz and 6 MHz, with a transmitted bandwidth of 100 kHz each. If the intermediate frequency (IF) is 850 kHz and high-side injection is used, what is the required bandwidth of the local oscillator?

In amplitude modulation, if a message signal of 5 kHz is modulated by a carrier wave of frequency 900 kHz, then the frequencies of the sidebands are:

According to Nyquist's sampling theorem, a continuous band-limited signal with no frequency components higher than fm Hz can be uniquely reconstructed if it is sampled at uniform intervals spaced at most by: