This article talks about mp3 and ipods. Which one do you think is good.

To be competitive in the market place phone card suppliers come up with all sorts of ways to make their phone cards look cheaper. Unsuspecting customers generally buy their phone cards based only on the per minute cost of the phone call. Calling card suppliers know this and try to hide the cost of the phone call in charges other than the call rate. These charges all add up to make the cost of the phone call breakeven after an average length phone call. Some of the more ...

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VOIP is an advanced technology that is used as one the modes of telecommunication. It has created its own space in the world of telecommunication. The main factor responsible for the functioning of the VOIP system is the broadband internet connection which has become a matter of concern for the customers as there is no proper coverage of network. Therefore, many VOIP service providers are working hard to increase the network coverage so the maximum percentage of the VOIP ...

It's hard to imagine how people managed to get by in the days before cell phones. Keeping people in touch 24 hours a day with few exceptions these phones help business get done, keep families in close contact and provide a ray of light when emergencies happen. One phone brand that tends to stand out among others in the minds of many is the Samsung cellular phone. The company that makes the Samsung cellular phone has been around for a while. Founded in 1938, the company is ...

Although we are most familiar with cellular phones, there is a whole different breed of portable phones some people are not aware even exist. While cell phones rely on towers to transmit voice signals, satellite phones transmit through a variety of satellites in the sky. Because they rely on satellites, these phones can work even in places where cell phones can?t. This gives them the advantage for people who travel, like to hike or hunt in places not covered by cell phone...

The limitations of satellite communication systems are determined by satellite's technical characteristics and its orbital parameters. Active communication satellite systems are limited by satellite transmitter power on the downlink frequencies and, to a lesser extent, by the satellite receiver sensitivity on the uplink frequencies.

A micro wave radio system sends signals through the atmosphere between towers spaced about twenty to thirty miles apart, amplifies the signals and retransmits them at each repeater station until they reach their destination. Microwave radio operates at high frequency end of the radio spectrum. The signals follow a straight line path and the relaying antennas must be within sight of each other. One of the principles problems affecting microwave signals is the variation caused by the changes in the atmosphere. Moisture and temperature conditions can make the radio beam bend, resulting in fading.

Mainly radio is practiced to transmit selected data to different geographical points through disjunctive media (aerial, spacial) without cables. As radio is used for channelizing sound and television signals, it is also used for transmitting data in ciphered form. It also sends out signals and pick up their reflections from the bodies in route. Some long ambit radios are used by cosmonauts to interact from other planets on earth and to channel information with them. They have there contact with their bases on different parts of the earth and with the different space ships and even between themselves with the help of the radio waves.

A radio receiver always has a radio frequency section, which is tunable circuit connected to the antenna terminals. It is there to select the wanted frequency and reject some of the unwanted frequencies. However such a receiver need not have a radio frequency amplifier following this tuned circuit. If there is an amplifier its output is fed to the mixer at whose input another tunable circuit is present.