General Information
Automatic Link Establishment second generation is based on
the standard MIL-STD 188-141A.
This system is used to detect and assign the
HF-channel which is
considered most reliable for data-communication at the given time.
Usage:
§ Detection of the HF-channel best suited for data-transfer between two stations.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Tones |
8 |
|
|
Tone distance (Hz) |
250 |
|
|
Bandwidth |
2000 |
|
|
Symbol rate (Bd) |
125 |
|
|
Data rate (bit/s) |
375 |
|
|
Alphabet |
ITA5 |
|
Demodulator Settings |
Demodulator |
Multitone (MFSK) |
|
|
Number of tones |
8 |
|
|
(ms) |
8 |
|
|
TD Tone duration tolerance (ms) |
0.050 |
|
|
Tone position type |
Equidistant frequencies |
|
|
Tone distance (Hz) |
250 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is midway between channels 4 and 5 | |
Table 3: ALE-2G
Figure 6: ALE-2G Spectrogram
Modem Version History
|
Release |
Date |
History |
|
2.0.0 |
2013-01-10 |
Modem added |