General Information
The High Frequency Data Link HFDL (ARINC Report 635-3) is used in civil long distance aircraft communications between aircrafts and a cluster of ground stations.
Usage:
§ Aeronautical information exchange over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
PSK2/4/8 |
|
|
Bandwidth (Hz) |
400 |
|
|
Symbol rate (Bd) |
1800 |
|
|
Error correction |
ARQ |
|
|
Data rate (bps) |
300 / 600 / 1200 /1800 |
|
Demodulator Settings |
Demodulator |
PSK data added |
|
|
Symbol rate (Bd) |
1800 |
|
|
SR tolerance (Bd) |
9 |
|
|
Modulation order |
2 |
|
|
Shift (Hz) |
170 |
|
|
Min. burst length (s) |
2.100 |
|
|
Max. burst length (s) |
5.000 |
|
|
Min. pause length (s) |
0.010 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
no |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
|
Frequencies (kHz) |
San Francisco USA, 2947 4672 5508 6559 8927 10081 11327 13276 17919 21934 Molokai USA, 2947 3019 3434 4687 5463 5514 6559 6565 8912 8936 10081 11312 11348 13276 13312 13324 17919 17934 21928 21937 Reykjavik ISL, 3116 3900 5720 6712 8977 11184 15025 17985 Riverhead, USA 3410 3428 5523 5652 6646 6652 6661 8831 8885 8912 10027 11315 11354 11387 13276 17919 17934 17952 21931 21934 Auckland NZL, 3016 3404 5583 6535 8921 10084 11327 13351 17916 21949 Hat Yai THA 3470 4687 5655 6535 8825 10066 13270 17928 21949 Shannon IRL, 2998 3455 5547 6532 8843 8942 10081 11384 Johannesburg AFS, 3016 4681 8834 13321 21949 Barrow USA, 2944 2992 3007 3497 4654 4687 5529 5538 5544 6646 8927 8936 10027 10093 11354 17919 17934 21928 21937 Albrook PAN, 2902 6589 6589 10063 17901 21940 Santa Cruz BOL, 2093 3467 4660 6628 8957 11318 13315 17916 21946 21973 21988 21997 Krasnoyarsk RUS, 2878 2905 4679 5622 6596 8886 10087 13321 17912 21990 Al Muharraq BHR, 2986 5544 8885 10075 11312 13354 17967 21982 Agana GUM, 5451 6652 8927 11288 11306 13312 17919 Telde, CNR, 2905 5589 6529 8948 11348 13303 17928 21955 | |
Table 126: HFDL
Figure 44: HFDL Spectrogram