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Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [1]
A short-range device (SRD), described by ECC Recommendation 70-03, is a radio-frequency transmitter device used in telecommunication that has little capability of causing harmful interference to other radio equipment.
Elektor SDR [39] Bare PCB and pre-built 150 kHz – 30 MHz ? No Soundcard ADC: 48, 96, and 192 kHz 0/1 USB Yes Yes Yes Elektor AVR SDR [40] Kit and pre-built up to 1 MHz in undersampling ? up to 15 kS/s 0/1 UART via RS2-232 converter or USB bridge Yes Yes Yes ELAD FDM-S1 [41] Pre-built 20 kHz – 30 MHz, up to 200 MHz in undersampling
Despite being able to transmit and receive data, the whole unit is colloquially referred to as a "receiver". On a mobile telephone or other radiotelephone, the entire unit is a transceiver for both audio and radio. A cordless telephone uses an audio and radio transceiver for the handset, and a radio transceiver for the base station.
A 'talkgroup' is an assigned logical group of users on a trunked radio system. Unlike a conventional radio which assigns users a certain frequency, a trunk system uses a number of frequencies allocated to the entire system.
A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").
The car then tells the driver that it will drop him or her off at the location and will circle around on its own and find a parking spot by itself, without you having to waste any time.
A basic packet radio station consists of a computer or dumb terminal, a modem, and a transceiver with an antenna. Traditionally, the computer and modem are combined in one unit, the terminal node controller (TNC), with a dumb terminal (or terminal emulator) used to input and display data.