Questo sistema di decodifica incluso in CODE300-A, è conforme alle specifiche ARINC 635-2. La trasmiisone è nella sottoportante dell'emissione USB a 1440 Hz. La velocità di Symbol Speed è sempre di 1800 Baud, e la modulzaione utilizzazta e 2psk, 4psk o 8psk. La velocità effettiva di trasmissione può variare trà 300, 600, 1200, 1800 bits/sec.
Queste le stazioni che usano questo sistema :
HDFL - HF Acars - ARINC specification 635-2 27/02/1998
This unit complies, at due time, with ARINC 635-2. Transmission is on a subcarrier 1440 Hz USB. Symbol speed is always 1800 baud. Modulation is 2psk, 4psk or 8psk. Effective bitrate: 300, 600, 1200, 1800 bits/sec. An ACARS-like system used between airplanes and ground stations for passing tech info is now operational on HF. The system is an adaption of the MIL-188-110A single tone waveform modem and uses 8PSK modulation at a rate of 3600chips/s. Ground stations broadcast system manage- ment uplink packets ('squitters') every 32s on 3 or more active frequencies. This assists in finding error free channels. Adaptive rates of 150, 300, 600, 1200 and 1800 bps are supported. Also known as HFDL or ACARS on HF. You may see this referenced as ARINC 753.
CH Stazione Frequenze in kHz
H01 Dixon, USA 8927 13276 17919 21934
H02 Molokai, HA, USA 11384 17934
H03 Reykjavic, Iceland 11184 15025
H04 River Head, USA 8912 11312 17919 21934
H05 Auckland, NZ 6535 11327
H06 Hat Yai, Thailand 5655 13309
H07 Shannon, Ireland 8843 11384
H08 Johannesburg, RSA 8834 13321 21949
H09
H10 Annapolis, USA 8885
H11
H12 Anchorage, Alaska, USA 11354
