# 아마추어 무선 이런저런 메모 #### R-S-T system 신호 리포트는 R-S-T 체계에 따라 보고한다. 명료도(1~5) - 신호강도(1~9) - 톤(1~9) ( wikipedia - [R-S-T system](https://en.wikipedia.org/wiki/R-S-T_system) ) 음성 전송에 대한 R-S-T system 은 R-S만 주로 사용한다. 예) "59", "five nine" - 완벽하게 읽을수있고, 매우 강한 강도이다. ##### Readability 1. Unreadable 2. Barely readable, occasional words distinguishable 3. Readable with considerable difficulty 4. Readable with practically no difficulty 5. Perfectly readable ##### Strength 1. Faint—signals barely perceptible 2. Very weak signals 3. Weak signals 4. Fair signals 5. Fairly good signals 6. Good signals 7. Moderately strong signals 8. Strong signals 9. Extremely strong signals ##### Tone 1936 definition 1. Extremely rough hissing note 2. Very rough AC note, no trace of musicality 3. Rough, low-pitched AC note, slightly musical 4. Rather rough AC note, moderately musical 5. Musically modulated note 6. Modulated note, slight trace of whistle 7. Near DC note, smooth ripple 8. Good DC note, just a trace of ripple 9. Purest DC note modern definition 1. 60 Hz AC or less, very rough and broad 2. Very rough AC, very harsh and broad 3. Rough AC tone, rectified but not filtered 4. Rough note, some trace of filtering 5. Filtered rectified AC but strongly ripple-modulated 6. Filtered tone, definite trace of ripple modulation 7. Near pure tone, trace of ripple modulation 8. Near perfect tone, slight trace of modulation 9. Perfect tone, no trace of ripple or modulation of any kind suffix code A - signal distorted by auroral propagation C - "chirp" (frequency shift at key-on or key-off) D - "drift" (frequency wandering) K - key clicks M - signal distorted by multipath propagation S - signal distorted by scatter propagation X - exceptionally stable frequency (crystal control)