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A '''computer aided transceiver (CAT)''' is a device used by [[radio amateurs]] for controlling a [[transceiver]] [[radio receiver]] using a [[computer]].
Conventional transmitters are manually controlled and used to transmit voice using buttons, dials, etc. However, advances in electronics have come to market devices that can be controlled by a computer and allowing digital modes such as [[packet radio]] and also the use of satellite tracking, because it can continuously change the device's frequency according to the [[Doppler effect]]. This is done by connecting Radio receiver and a PC using a [[CAT interface]] and a [[CAT Program]]
A CAT interface is a piece of hardware that connects between the PC and a radio that provides a connection to allows the radio and the PC to communicate with each other. The CAT interface provides the signals to and fro via correct voltage levels and in the case of a Universal Serial Bus (USB) CAT interface it requires a "protocol" for communication but communication itself is down to the radio and the software on the PC.
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DATA modes, and getting audio to and from the PC is the function of a DATA interface. A completely different thing but it is easier and more useful when CAT and DATA are used at the same time. Wouldn't it be nice to have an interface that could operate Frequency-shift keying (FSK), Audio FSK (AFSK), (real) Morse Code (CW), with a CAT interface and its own sound card..... (eg. The DigiMaster Pro3).
== See also ==
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