General Information
ALIS is a simplex ARQ teleprinter system developed by Rhode & Schwarz.
Usage:
§ Transfer of textual information over HF with automatic Link setup.
Mode Details
|
|
Item |
Value |
|
Standard |
Number of tones |
2 |
|
|
Shift (Hz) |
170 |
|
|
Symbol rate (Bd) |
228.7 |
|
|
Error correction |
CRC-16 |
|
|
Alphabet |
ITA-2 |
|
Demodulator Settings |
Demodulator |
FSK 2,3,4 discr. |
|
|
Symbol rate (Bd) |
228.67 |
|
|
SR tolerance (Bd) |
1.000 |
|
|
Modulation order |
2 |
|
|
Shift (Hz) |
170 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Synchronous |
|
|
Min. burst length (s) |
0.210 |
|
Features |
Max. burst length (s) |
0.260 |
|
|
Min. pause length (s) |
0.010 |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 4: ALIS
Figure 2: ALIS Spectrogram