Definitions by IRISHrepublicanARMY
Morse Code
A communications system consisting of letters coded into dots and dashes, and used in radiotelegraph systems. (usally HF systems), and its fun to jam freeband stations with this stuff.
Morse Code by IrishRepublicanArmy January 27, 2004
pantaphobia
pantaphobia by IRISHrepublicanARMY January 26, 2004
cordless phone
1) Pretty much a phone with a full-duplex (i.e. tranmit on one frequency and recieve on another, and it always transmitting and recieving) (radio), and that allows both people on the line can yell at each other at the same time.
2) A device permantly attachted to a teenybopper.
2) A device permantly attachted to a teenybopper.
Whats great is, people think cordless phones cannot be listened to, but sense it uses radio waves to be 'cordless', then anyone with a scanning reciever on the base (this is a duplex system, remember) can listen to BOTH sides of the conversation.
In my free time, i listen to my neighbor's cordless phone conversations on my radioshack radio scanner.
In my free time, i listen to my neighbor's cordless phone conversations on my radioshack radio scanner.
cordless phone by IrishRepublicanArmy January 25, 2004
grikah
grikah by IrishRepublicanArmy January 25, 2004
CDMA
Code Division Multiple Access
A spread spectrum approach for the digital transmission of data/voice over radio frequencies. Sound bits are digitized and the data is split into data packets that are encoded with unique identification tags. All of the data/voice is sent over a spread range of radio frequencies. The cell phone or data device receives all of the data packets but only re-assembles those packets with the correct code and transforms the broken-up bits of data into useful sound and data. This allows more traffic for a finite number of available frequencies than analog or the other digital standards.
A spread spectrum approach for the digital transmission of data/voice over radio frequencies. Sound bits are digitized and the data is split into data packets that are encoded with unique identification tags. All of the data/voice is sent over a spread range of radio frequencies. The cell phone or data device receives all of the data packets but only re-assembles those packets with the correct code and transforms the broken-up bits of data into useful sound and data. This allows more traffic for a finite number of available frequencies than analog or the other digital standards.
CDMA by IrishrepublicanArmy January 24, 2004
TDMA
Time Division Multiple Access
A method of digital wireless communications transmission allowing a large number of users to access (in sequence) a single radio frequency channel without interference by allocating unique time slots to each user within each channel. Rather than encoding bits of data like CDMA, each frequency is broken into time slots through which bits of data flow. Data can only flow in their assigned time slots.
A method of digital wireless communications transmission allowing a large number of users to access (in sequence) a single radio frequency channel without interference by allocating unique time slots to each user within each channel. Rather than encoding bits of data like CDMA, each frequency is broken into time slots through which bits of data flow. Data can only flow in their assigned time slots.
Cellular (mobile) Phones use CDMA, TDMA, analog, or GSM for radio (voice) transmission as well as wireless internet connections.
TDMA by IrishrepublicanArmy January 24, 2004
GSM
Global System for Mobile communications.
The most common digital cellular system in the world. GSM is used all over Europe, plus many countries in the Middle East, Asia, Africa, South America, Australia, and North America. GSM's air interface is based on narrowband TDMA technology, where available frequency bands are divided into time slots, with each user having access to one time slot at regular intervals. Narrow band TDMA allows eight simultaneous communications on a single radio multiplexor and is designed to support 16 half-rate channels. GSM also is the only technology that provides incoming and outgoing data services, such as email, fax, and internet surfing. GSM makes use of a SIM card that allows memory portability between dumb GSM phones.
The most common digital cellular system in the world. GSM is used all over Europe, plus many countries in the Middle East, Asia, Africa, South America, Australia, and North America. GSM's air interface is based on narrowband TDMA technology, where available frequency bands are divided into time slots, with each user having access to one time slot at regular intervals. Narrow band TDMA allows eight simultaneous communications on a single radio multiplexor and is designed to support 16 half-rate channels. GSM also is the only technology that provides incoming and outgoing data services, such as email, fax, and internet surfing. GSM makes use of a SIM card that allows memory portability between dumb GSM phones.
The GSM system allowed for both internet surfing and digital voice communications over 1900 MHz radio networks.
GSM by IrishrepublicanArmy January 24, 2004