ALE-2G

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