ALIS-2

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