General Information
ALE-400 is an Automatic Link Establishment system used by amateur radio. It is a version of ALE-2G adapted to the demands of amateur radio emergency traffic handling.
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) |
50 |
|
|
Bandwidth |
400 |
|
|
Symbol rate (Bd) |
50 |
|
|
Data rate (bit/s) |
150 |
|
|
Alphabet |
ITA5 |
|
Demodulator Settings |
Demodulator |
Multitone (MFSK) |
|
|
Number of tones |
8 |
|
|
Tone duration (ms) |
20 |
|
|
TD tolerance (ms) |
2 |
|
|
Tone position type |
Equidistant frequencies |
|
|
Tone distance (Hz) |
50 |
|
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 5: ALE-400
Figure 8: ALE-400 Spectrogram
Modem Version History
|
Release |
Date |
History |
|
2.2.0 |
2014-03-19 |
Modem added |