1、RX ITU-R SM.1135 47 SECTION 1D: RECOMMENDATIONS “INCORPORATED BY REFERENCE INTO THE RADIO REGULATIONS AS REVISED BY THE WORLD RADIOCOMMUNICATION CONFERENm 1995 RECOMMENDATION ITU-R SM.l135* SWO AND SINFFEMO CODES (1995) The Radiocommunication Assembly, considering a) the Final Report and recommendat
2、ions of the Voluntary Group of Experts (VGE) to study allocation and improved use of the radio-frequency spectrum and simplification of the Radio Regulations (RR) which was established in accordance with Resolution No. 8 of the Plenipotentiary Conference (Nice, 1989) and continued its work in accord
3、ance with Resolution No. 8 of the Additional Plenipotentiary Conference (Geneva, 1992); b) that the 1995 World Radiocommunication Conference (WRC-95) will consider and adopt, as appropriate, proposals for the Simplified RR; c) that it would be advisable for all administrations to use the same signal
4、 reporting codes, and that the number of officially recognized codes must consequently be as restricted as possible; 4 that the abbreviations in the Q code are in general inadequate for obtaining a clear idea of the quality of a transmission; e) that the SINPO code has been used for several years by
5、 some administrations; f) that the SINPO code gives a more accurate description of the transmission quality and is easy to use; g) that the SINPFEMO code is derived from the SINPO code by adding three letters relating to special features of telephone transmissions and is easy to use; h) that the inf
6、ormation which is not included in the Si“0 or SINPFEMO code may be transmitted satisfactorily by service message, recommends that the SINPO and SINPFEMO codes given in Annex 1 shall be used by administrations. 1 Reference has been made to this Recommendation in the Radio Regulations (RR) as revised
7、by the World Radiocommunication Conference 1995 (WRC-95). This will come into force on 1 June 1998. 48 S Signal strength Excellent Good Fair Poor 1 Barely audible Rating scale I N P O Overall rating Degrading effect of Propagation disturbance Interference Noise Nil Nil Ni 1 Excellent Slight Slight S
8、light Good Moderate Moderate Moderate Fair Severe Severe Severe Poor Extreme Extreme Extreme Unusable - - ITU-R RECMN*SM* SERIES 75 4855212 0526773 997 Rec. ITU-R SM.1135 Rating scale ANNEX 1 Signal strength SINPO and SINPFEMO codes Nil Slight Moderate Severe Extreme SINPO signal reporting code Nii
9、Slow Moderate Fast Very fast Overall rating Mechanized Operations I 5. Excellent 4. Good 3. Fair 2. Poor 1. Unusable 4 3 2 4-channel time-division multiplex 2-channel time-division multiplex Marginal single start-stop printer BKs, XQs and call signs readable Unreadable SINPFEMO signai reporting code
10、 Interference Nil Slight Moderate Severe Extreme Noise Frequency of fading Degrading effect of disturbance Nil Slight Moderate Severe Extreme Quality Overall rating Depth Excellent Good Fair Poor Very poor Maximum Good Fair Poor or Nil Continuously over- modulated Excellent Good Fair Poor Unusable S
11、pecial remarks: a) b) c) d) A signal report shall consist of the code word SINPO or SINPFEMO followed by a group of five or eight numerais, rating, respectively, the five or eight characteristics of the particular signai code. The letter X shall be used instead of a numeral for characteristics not r
12、ated. Although the code word SINPFEMO is intended for radiotelephony, it may be used for radiotelegraphy. The overall rating for radiotelegraphy shall be as indicated in Tables 1 and 2. TABLE 1 ITU-R RECMN*SM* SERIES 95 4855232 0.526774 823 Rec. ITU-R SM.1135 Overall rating TABLE 2 Morse Operation O
13、verall rating 5. Excellent 4. Good _ _ 5. Excellent 4. Good 3. Fair 2. Poor 1. Unusable Operating Condition Quality Signai quality unaffected Commercial Signal quality slightly affected High speed 100 wpm 50 wpm BKs, XQs and call signs readable Unreadable 3. Fair 2. Poor 1. Unusable e) The overall rating for telephony shall be as indicated in Table 3. Signal quality seriously affected; channel usable by operators or by experienced subscribers Channel just usable by operators Channel unusable by operators Marginally commercial Not commercial TABLE 3 I I I I 49
