General Information
ALIS-2 is simplex ARQ teleprinter system developed by Rhode &
Schwarz.
ALIS-2 is a further development
of ALIS.
Usage:
§ Transfer of textual information and binary data over HF with automatic Link setup.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
8 |
|
|
Tone spacing (Hz) |
240 |
|
|
Symbol rate (Bd) |
240.82 |
|
|
Error correction |
CRC-16 |
|
|
Alphabet |
ITA-5 |
|
Demodulator Settings |
Demodulator |
Multitone (FSKn) |
|
|
Tone duration (ms) |
4.153 |
|
|
TD tolerance (ms) |
0.100 |
|
|
No. of tones |
8 |
|
|
Tone position type |
Equidistant frequencies |
|
|
Tone distance (Hz) |
240.816 |
|
|
Min. burst length (s) |
0.040 |
|
Features |
Max. burst length (s) |
0.350 |
|
|
Min. pause length (s) |
0.070 |
|
|
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
no |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 7: ALIS-2
Figure 3: ALIS-2 Spectrogram