By 1951, the CCEB had published ACP 125(A) (a.k.a.As early as 1943, the U.S and UK military published the first guidance that included the modern "Weak but readable", "Strong but distorted", and "Loud and clear" phrases.The Amateur radio R-S-T system signal report format currently in use was first developed in 1934.The QSA code was included in the Madrid Convention (Appendix 10, General Regulations) sometime prior to 1936.The QSK code was one of the twelve Q Codes listed in the 1912 International Radiotelegraph Convention Regulations, but may have been in use earlier.Navy used R and K signals starting in 1929. The first signal report format code may have been QJS. All but one of these signal report formats involve the transmission of numbers.Īs the earliest radio communication used Morse code, all radio signal reporting formats until about the 1920s were for radiotelegraph, and the early voice radio signal report formats were based on the telegraph report formats. These report formats are usually designed for only one communications mode or the other, although a few are used for both telegraph and voice communications. A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment.
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