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Wideband Antenna Types

Wideband Antenna Types: It is often desirable to have an antenna capable of operating over a wide frequency range. This may occur because a number of widely spaced channels are…

Sky Wave Propagation Frequency Range

Sky Wave Propagation Frequency Range: Sky Wave Propagation Frequency Range is the ionosphere is the upper portion of the atmosphere, which absorbs large quantities of radiant energy from the sun,…

Double Stub Matching

Double Stub Matching: If a transmission-line matching device is to be useful in a range of different matching situations, it must have as many variable parameters, or degrees of freedom,…

Noise and Frequency Modulation

Noise and Frequency Modulation: Noise and Frequency Modulation is much more immune to noise than amplitude modulation and is significantly more immune than phase modulation. In order to establish the…

Theory of Frequency Modulation and Phase Modulation

Theory of Frequency Modulation and Phase Modulation: Frequency Modulation and Phase Modulation is a system in which the amplitude of the modulated carrier is kept constant, while its frequency and…

Generation of Amplitude Modulation

Generation of Amplitude Modulation: There are two types of devices in which it may be necessary to the Generation of Amplitude Modulation. The first of these, the AM transmitter, generates…

External Noise in Communication System

External Noise in Communication System: The various forms of External Noise in Communication System created outside the receiver are namely 1. Atmospheric Noise, 2. Extraterrestrial Noise, Solar noise Cosmic noise…

Arithmetic Instructions in 8051

Arithmetic Instructions in 8051: The Arithmetic Instructions in 8051 of Basic Assembly Language Programming are ADD, ADDC, SUBB and DA The ADD instruction adds a byte variable with the accumulator,…