One of the following is not useful for comparing the noise performance of receivers

When the power ratio of the output to input of a circuit is 200. What is the gain in dB?

A network that has an input of 75 dB and an output of 35dB. The loss of the network is _____

Which of the following is not a simplex communication system?

The entire range of _____ of electromagnetic radiation is called the frequency spectrum.

A circuit often used in radio receivers that prevents externally generated noise from exceeding certain amplitude. They are also called noise clippers.

When the power ratio of the output to input of a circuit is 200. What is the gain in dB?

A passive circuit, usually consisting of capacitance and/or inductance, that is inserted in series with the a-c power cord of an electronic device which allow the 60-Hz current to pass and suppressed high frequency noise components.

Which parameter is referred to as receiver sensitivity?

Is the reduction of signal amplitude as it passed over the transmission medium?

Digital information is processed with a specified degree of

Atmospheric noise is less severe at frequencies above

These are bend of light wavelengths that are too short to be seen by the human eye.

What is the main purpose of a communications system?

The range of frequencies represented in a signal

One of the following type of noise becomes of great importance in high frequencies. It is the

Noise figure is a parameter that represents a ______ of the system

The frequency interval between two sounds whose frequency ratio is 10

It is the representation of a complex waveform in such a way that the sinusoidal components are displayed as a function of time.

The first complete system of wireless communications was provided by