HF | string
| High Frequency radio voice channel. |
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VHF | string
| Very High Frequency radio voice channel with 25 KHz spacing. |
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VDL1 | string
| Legacy VHF data link protocol employing CSMA. Being replaced by VDL2 |
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VDL2 | string
| VHF data link protocol employing CSMA but much more efficient than VDL1. |
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VDL4 | string
| VHF data link protocol using TDMA; being considered for use by ADS-B. |
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AMSS | string
| Aeronautical Mobile Satellite Service, currently used by ACARS. |
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ADS_B | string
| Automatic Dependent Surveillance - Broadcast: standard mode. |
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ADS_B_VDL | string
| Automatic Dependent Surveillance - Broadcast: extended mode, using VDL 4. |
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HFDL | string
| High Frequency Data Link. |
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VHF_833 | string
| Very High Frequency radio voice channel with 8.33 KHz spacing. |
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UHF | string
| Ultra High Frequency radio voice channel. |
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OTHER | string
| Other. |
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