Key:communication:amateur_radio:repeater:modulation
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 communication:amateur_radio:repeater:modulation
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| Description |
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Describing modulation schema of an amateur radio repeater. 
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| Group: communications |
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| Status: in use |
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Use communication:amateur_radio:repeater:modulation=* to assign the modulation schema of an amateur radio repeater.
Values
The "modulation" value has to be selected according to WARC 79 agreed system for classifying radio frequency signals. An emission designation is of the form BBBBMSIDX.
| Character | Description | Usage | Common Values |
|---|---|---|---|
| BBBB | bandwidth of signal | mandatory | 20K0 (20.0kHz); 11K2 (22.2kHz) |
| M | type of modulation (main carrier) | mandatory | F (FM), A (AM), J (SSB) |
| S | type of signal | mandatory | 0 (unmodulated), 1 (FSK), 2 (AFSK), 3 (analog signal) |
| I | type of information | mandatory | A (CW), B (teletype), E (analog esp. voice), F (TV) |
| D | practical details of information | optional | A (CW), J (low bandwidth analog, voice) |
| X | method of multiplexing | optional | N (no multiplex) |
More detailed tables can be found on wikipedia:Types of radio emissions.
Common amateur radio wide FM (25kHz channel separation) repeater modulation is "20K0F3E". Amateur radio modulation narrow FM (12.5kHz channel separation) is "11K2F3E".