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The Basics of Satellite Radio Systems
Satellite radio systems are the consumer’s access to space-based audio technology, offering uncensored, commercial-free programming that comes in crystal clear no matter where you are. But how do they actually work?
The most basic explanation is as follows: programming is transmitted to a communications space satellite, which beams a digital signal back to earth. The signal is encrypted, so it can only be picked up by special proprietary equipment. The signal can be broadcast across more than 22,000 miles and received by the end user with absolutely no degradation in clarity or sound quality.
Tags: cutting edge communications, digital audio radio, edge communications technology, federal communications commission, sirius satellite radioRelated posts
Portable Two Way Radios
Portable two way radios are a convenient and relatively low priced means of communication. Two way radios are transceivers – that means they can both receive and transmit messages simultaneously. They are unlike broadcast receivers (such as the ordinary radio) which only receive messages or signals. A good example of the two way radio concept is the mobile phone and the hand held radio referred to as the walkie talkie. There are different categories of portable two way radios and each has its benefits and the circumstances for which it is most suitable.
The conventional portable two way radios operate on a fixed RF (radio frequency) channel. Even where a two way radio has the ability to tune into more than one channel, the user is required to select only one since the radio can only operate on a single channel at a time. Radios with multiple channel capability have a button or a channel selector as part of their control panel. Often, the frequency regulator responsible for a certain area will allocate different channels to different organizations. For instance, one channel can be assigned to a cab company in order to facilitate communication between the dispatcher and the taxi drivers.
Tags: broadcast receivers, duplex radio, radio concept, rf radio frequency, trunked radio