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Ten-codes are abbreviated phrases used by public safety officials and CB radio users to reduce speech on the radio. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
The 10-meter band is a portion of the shortwave radio spectrum internationally allocated to amateur radio and amateur satellite use on a primary basis. It consists of frequencies stretching from 28.000 to 29.700 MHz and has different propagation characteristics depending on the solar cycle and season.
Learn about the different frequencies and modulation codes used by GPS satellites to broadcast navigation signals to receivers on Earth. Compare the legacy L1 C/A and L2C signals with the modernized L5 and L1C signals, and the restricted signals with encrypted coding.
Learn how amateur radio bands are regulated by national and international authorities, and how they vary by region and mode. Find out the characteristics and propagation of different frequency ranges, from 160 metres to 10 GHz.
Learn about the different frequency bands and channels used for Wi-Fi communications based on IEEE 802.11 protocols. Find out the channel numbers, frequencies, and bandwidths for 802.11ah, 2.4 GHz, and 5 GHz bands in various regions.
Citizens band radio (CB radio) is a land mobile radio system for short-distance voice communication among individuals, using two-way radios near 27 MHz. Learn about its history, technical standards, and usage in different countries.
Learn about the different types and examples of police codes used in the United States, such as 10 codes, signals, incident codes, and response codes. See how codes vary by state, county, and agency, and how they are related to the California Penal Code.
Learn about the VHF maritime mobile band, the channels used for ship-to-ship, ship-to-shore and ship-to-aircraft communication, and the types of equipment and features of marine VHF radio. Find out the history, regulation and background of this worldwide system of two way radio transceivers on ships and watercraft.