General Information
Clover 2000 mode is a standard developed by HAL
Communications Corp., USA.
Clover 2500 is a version with identical modulation types and coding but
increased bandwidth (2500 Hz) and symbol-rate.
Usage:
§ ARQ and broadcast data communication over HF.
Mode Details
|
|
Item |
Value | |
|
Standard |
Modulation |
DBPSK / DQPSK / 8-DPSK / 8P2A / 16P4A | |
|
|
Number of channels |
8 | |
|
|
Channel spacing (Hz) |
250 |
312.5 |
|
|
Bandwidth (Hz) |
2000 |
2500 |
|
|
Symbol rate (Baud) |
62.5 |
78.125 |
|
|
Coding |
Reed-Solomon | |
|
Demodulator Settings |
Demodulator |
Clover 2000 | |
|
|
Modulation order |
64 | |
|
|
Min. burst length (s) |
0.270 | |
|
|
Max. burst length (s) |
4.400 | |
|
|
Min. pause length (s) |
0.040 | |
|
|
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 82: Clover 2000 / 2500
Figure 29: Clover 2000 Spectrogram