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R-S-T system is a code for assessing the quality of a radio signal received by amateur radio operators and other radio hobbyists. It consists of three digits for readability, strength, and tone, with optional suffixes for special conditions.
Learn about the various modes of radio communication used in the amateur radio hobby, from Morse code to digital voice to image and data. Compare the modulation types, operating protocols, and features of each mode.
Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. 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).
Learn about the different formats and codes for reporting the strength and quality of radio signals and voice communications. The R-S-T system uses 1 to 5 for readability and 1 to 9 for signal strength, while the SINPO and SINPEMFO codes use 1 to 5 for each factor.
Learn about the FCC-issued licenses to operate amateur stations for personal use, the classes, privileges, exams and history of amateur radio in the US. Find out how to become a volunteer examiner and access the online database of licenses.
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.
Q code is a collection of operating signals for commercial and amateur radio communication. It includes codes for questions, answers, notices, meteorology, and other topics, with different ranges for aeronautical, maritime, and all services.
The QN Signals are Morse code operating signals that were introduced for Amateur radio net operation in 1939 on the Michigan QMN Net to lighten the burdens of net control operators. Originally created by a committee of the Detroit Amateur Radio Association led by Ralph Thetreat, W8FX. [1]