A general communication system consists of information source, transmitter, channel, receiver and destination. Information or intelligence is basically a physical quantity such as mass or length. Thus

The functions performed by repeaters are amplification and frequency down conversion. Repeater amplifies signal from a low power level of the order of negative hundred decibels watt to an output power

Apart from noise, other forms of interference are found in radio receivers such as image frequency, transmitters operating on an adjacent channel and transmitters operating on the same channel. Freque

A record number of festival goers descended on the picturesque town of Novi Sad, with over 10,000 Brits enjoying delights of the Petrovaradin fortress for this year’s Exit Festival in Serbia. Eager r

By the term static is meant the radio disturbance caused by natural causes such as lighting, electrical sparks etc. the disturbances so produced in a receiver are sometimes called noise but usually th

By fading of a radio signal we mean that incident wave change in the field strength of signal received from distant transmitter. The fading of signal may be put into the following two categories namel

When two signals of slightly different frequencies are applied to a circuit, then because of third order action, the amplitude of the output voltage of one signal depends upon the amplitude of the oth

In a frequency mixer the radio frequency signal voltage if frequency and local oscillator voltage of frequency are applied to its input. The frequency mixer uses a device which presents non linear dyn

Multi unit Steer-able Antenna System is an excellent diversity reception system and utilizes the some of the facts like short wave signals from a distant transmitter reach a receiver at certain prefer

In a radio transmitter power supplies are required to provide anode and grid screen voltages, grid bias voltage and filament voltages. The nature of basic supply used for any transmitter depends prima