A radio frequency (RF) signal generator is used in generating high frequency signals at a specific frequency for testing laboratories. The output frequency may range for example from about 100 kHz to around 40 GHz. A typical RG generator consists … Read more
Tag: Radio Frequency (RF)
Features of FM Receivers
FM receivers employ heterodyne principle. The FM broadcast signals lie in the frequency range between 88 MHz and 108 MHz. The intermediate frequency (IF) of a FM receiver is 10.7 MHz which is much higher than the IF value of … Read more
Radio Frequency (RF) and Microwave – Multiple Choice Questions & Answers (MCQ3)
The Answers have been provided at the end of Questions.
Q1. What is the approximate bandwidth of radio frequency (RF) electromagnetic waves?
A. 300 Hz to 300 GHz
B. 20 Hz to 20 kHz
C. 300 Hz to 3000 … Read more
Demodulation in Telecommunication Systems
Demodulation is the process of recovering the audio signal from the modulated wave. Demodulation is also known as detection in communication systems.
Why Demodulation is needed in Telecommunication Systems
Amplitude modulated wave consists of carrier and sideband frequencies. The audio … Read more
Modulation in Communication Systems
Introduction
Modulation is the process of changing some characteristics (e.g. Amplitude, Frequency, or Phase) of a carrier wave in accordance with the intensity of the message signal.
Modulation means to ‘’change’’. In Modulation, some characteristics of the carrier wave … Read more
Radio Frequency (RF) and Microwave Spectral Analysis
The Basics Facts about Photons
Photons are the elemental units of electromagnetic spectrum. For example, white light is composed of a number of different kinds of photons, some are red photons, some are blue photons, etc. Note that, there is no white photon; instead the … Read more
General Principles of Radio Broadcasting, Transmission and Reception
Radio communication is the radiation of radio waves by the transmitting station, the propagation of these waves through the space and their reception by the radio receiver.
The figure above shows the general principles … Read more
Introduction to Radio Broadcasting, Transmission and Reception
In radio transmission, it is necessary to send audio signal e.g. music, speech, etc. from a broadcasting station over great distances to a receiver. This communication of audio signal does not employ any wire and is sometimes called wireless. The … Read more
Components that make up a RF Communication System
Communication is the process of transferring information from one place to another. The information that is generated at the source is transferred to the receiver through communication channel.
From the diagram above, on the … Read more