General Information
Clover-II mode is a proprietary standard developed by HAL Communications Corp., USA.
Usage:
§ ARQ and broadcast data communication over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
DBPSK / DQPSK / 8-DPSK |
|
|
Number of channels |
4 |
|
|
Channel spacing (Hz) |
125 |
|
|
Bandwidth (Hz) |
500 |
|
|
Symbol rate (Baud) |
31.25 |
|
|
Coding |
Reed-Solomon |
|
Demodulator Settings |
Demodulator |
Clover II |
|
|
Modulation order |
4 |
|
|
Min. burst length (s) |
0.540 |
|
|
Max. burst length (s) |
17.824 |
|
|
Min. pause length (s) |
0.064 |
|
|
0 | |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 79: Clover-II
Figure 28: Clover-II Spectrogram