General Information
Haegelin Crypto ARQ is a synchronous simplex ARQ system (no longer) used by UN and IRC.
Usage:
§ Transfer of textual information over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Tones |
2 |
|
|
Shift (Hz) |
200 |
|
|
Bandwidth (Hz) |
300 |
|
|
Symbol rate (Bd) |
240 |
|
|
Alphabet |
ITA-2 |
|
|
Modulation |
FSK |
|
Demodulator Settings |
Demodulator |
FSK 2,3,4 discr. |
|
|
Symbol rate (Bd) |
240 |
|
|
SR tolerance (Bd) |
0 |
|
|
Modulation order |
2 |
|
|
Shift (Hz) |
200 |
|
|
Shift tolerance (Hz) |
48 |
|
|
Modem type |
Synchronous |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
yes |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal’s frequency range | |
Table 8: HC-ARQ
Figure 10: HC-ARQ Spectrogram
Modem Version History
|
Release |
Date |
History |
|
2.0.0 |
2013-01-10 |
Modem added |