Signal Strength

Radio Record, Volume II, Issue 16, 2 November 1928, Page 24

Signal Strength

‘THE "R" system of indicating audibility or strength of reception originated with the American Radio Relay League-the strongest body of orgiunised 1 radio amateurs in the world. Members .f the "A.R.R.L.," as it is "ulled, handle a great deal of important traffic in the way of telegrams to and from out-of-the-way places. (In fact, the U.S. radio amateurs have more than once been able to perform national services owing to the efficacy of their short-wave relay system, ) In order to promote good working between the different stations it became necessary to have a standard series of abbreviations to indicate the various signal strengths. This was the original "R" system as applied to "adio, and given in the rules and regulations of the A.R.R.L. Ri.-Faint signals, just audible.’ we R2.-_ Weak signals, barely readable, R3.-Weak signals. but readable. R4.-Fair signals, easily readable. R5.-Moderately strong signals. R6.-Strong signals. R7.-Good. strong signals, readable through interference. R8.-Very strong signals, audible several feet from ’phones. R9.-Extremely strong signals,