Are you contemplating investing in a satellite radio? There are a few things you should know before installing satellite radio and purchasing the best satellite radio service. Below are some ideas that will help you make a knowledgeable comparison between the two major satellite radio companies–XM and Sirius, and determine which programming and subscription service [...]

Hobbyist who are into aircraft models swear that there is no greater excitement then seeing an aircraft model which they built by hand, fly in the air. These flying aircraft models can be classified into three major groups. First, there is the free flight model aircrafts which flies in the air without any attachment to [...]

Federal Communication Commission that is FCC allocated a spectrum in the “S” band that is frequency of 2.3 Giga Hertz for nationwide broadcasting of satellite based Digital Audio Radio Service (DARS). At that time only four companies applied for a license to broadcast over that band. The Federal Communication Commission gave licenses to two of [...]

The three main components of satellite radio are Satellites, Radio receivers and the repeaters installed on the ground. The XM satellite radio uses two satellites namely Rock and Roll. These two satellites are placed at an angular distance of thirty five degrees from each other. They are placed in the geostationary earth orbits which are [...]

All of us have our favorite radio stations that we preset into our car radios and keep on flipping between them as we drive to and from work, on errands and around town. But at times we travel too far away from the station. In this case the signal breaks up and fades into static. [...]

The Microwaves are portion of the electromagnetic spectrum where the wavelength falls between about one millimeter and thirty centimeters. Microwave frequency bands extend from about one gigahertz to three hundred gigahertz and are useful for short range, high reliability radio and television links. Systems operating at microwave frequencies are radar, mobile radio, satellite communications, terrestrial [...]

The earth’s magnetic field exerts a deflecting force on the moving electrons. This force on an electron is proportional to the product of instantaneous velocity of the electron and the component of earth’s magnetic field at right angles to the velocity of the electron. The direction of this force is at right angles to both [...]

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 namely general fading or synchronous fading and selective fading. The fading is caused due to interference between waves that have traveled [...]

The radio waves traveling through the ionosphere possess kinetic energy. This kinetic energy is imparted to the free electrons. Thus these free electrons in the ionosphere are set to vibration. These vibrating electrons collide with gas molecules from time to time in spite of the low gas pressure in the ionosphere. An electron on colliding [...]

Pulse amplitude modulation, pulse width modulation and pulse position modulation form cases of analog pulse system. Pulse code modulation and delta modulation form cases of digital pulse modulation. Pulse code modulation in similarity with other pulse modulations uses the sampling technique but it differs from the others in that it is a digital process. Thus [...]