Propagation Mode

2013-09-21, 3:28 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

The power transmitted from an antenna is spreaded ON a large area, along with the distance tge received power depends on wavelength and gain of transmitting antenna and receiving antenna but as s

Propagation Modes

2013-09-19, 10:32 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

Multimode is named because multiple beams from a light source move through the core in different paths.

An

Radiation Pattern

2013-09-20, 1:14 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

The radiated energy from an antenna is not of the same strength in all directions.

Requirement for Satellite Communication

2013-09-21, 1:57 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

The signals having frequency more than 30 MHz are pass through ionosphere and these are required to reflected back to earth by some artificial medium for establishing reliable communication betwe

Return to Zero (RZ)

2013-10-01, 12:18 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

Transitions are required by receivers clock to maintain synchronization. In RZ encoding technique a signal change (transition) for each bit is assured. Bu

Satellight Communication

2013-09-21, 1:51 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

A communication satellite is basically an electronic communication package placed in orbit around the earth.If a transmitting station on earth cannot communicate dir

Shannon,s Law

2013-09-19, 10:04 AM By rushabhpatel381 Unit 1 , Theory 0 Comments

Let a source sends messages at the information rate of R bits/second. One can intuitively reason that, for a given communication system, as the information rate increases

Sky Wave Propagation

2013-09-21, 9:46 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

In Sky wave propogation the signal from an earth based antenna is reflected back down to earth from the ionized layer of the upper atmosphere (ionosphere) situated between 50 Km to

Spectrum

2013-09-18, 3:59 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

The spectrum of a signal is the range of frequencies that it contains.

The entire radio spectrum ranges in frequency from 3 kiloherd

Terrestrial Microwave

2013-09-21, 1:34 PM By rushabhpatel381 Unit 1 , Theory 0 Comments

Terrestrial microwave communication employ's earth based transmitters and recievers.

The frequencies used in it are in the low-gigahertz rang, which limit all communications to line-of-