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| CodeFacilityRankingType | Rule | |||||
|---|---|---|---|---|---|---|
| PRIMARY | Use for main/normal frequency | |||||
| SECONDARY | Use for secondary frequency and also if other terms (stand-by freq, back-up freq, alternate freq) are used in the sense of a secondary frequency
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| EMERG | Use for emergency frequency, e.g. 121.500 MHZ (Aeronautical emergency frequency), 123.100 MHZ (Auxiliary frequency (SAR)) | |||||
| GUARD | Use if used in the sense of "listening only" frequency, except for emergency frequencies | |||||
| ALTERNATE |
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Coding Rules for Radio Communication Channel
| Include Page | ||||
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