UHF. 4 stations listed.
| Station | Country | Location | Power (kW) | Schedule (UTC) | Language |
|---|---|---|---|---|---|
| OBJECT A Mode U - Transmitter - Downlink | China | — | — | — | — |
| PTD-4, PT4F1N Mode U - FSK9k6 - Downlink | International | — | — | — | — |
| PTD-R Mode U - FSK9k6 - Downlink | International | — | — | — | — |
| SITRO-AIS-46 Mode U - GMSK2k4 - USP - Downlink | International | — | — | — | — |