![]() ![]() SINPO is an acronym for Signal, Interference, Noise, Propagation, and Overall, which was developed by the CCIR in 1951 (as C.C.I.R. Sixty cycle a.c or less, very rough and broad tone, rectified but not filteredīarely readable, occasional word distinguishable Near pure tone, trace of ripple modulationįiltered tone, definite trace of ripple modulationįiltered rectified a.c. Near perfect tone, slight trace of modulation Perfect tone, no trace of ripple or modulation of any kind During amateur radio contests, where the rate of new contacts is paramount, contest participants often give a perfect signal report of 599 even when the signal is lower quality, because always providing the same signal format enables them to send Morse code with less thought and thus increased speed. It reports the readability on a scale of 1 to 5, the signal strength on a scale of 1 to 9, and the tone of the Morse code continuous wave signal on a scale of 1 to 9. This system was developed by amateur radio operator Arthur W. ![]() and Canada have used the R-S-T system since 1934. Radiotelegraph report formats Q-Code signal report formats Īmateur radio users in the U.S. SGM-1O82-51), which formalized the 1943 "Loud and clear" format. 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.digital radio transmission modesĪs 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.
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