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PACTOR
CLOVER 2
CLOVER2000

CLOVER2000

CLOVER2000

ParameterValue
SystemHalf-duplex ARQ
Center frequencyIn the range (−3000,+ 3000) Hz; automatic frequency control (AFC): +/−50 Hz
Speed62.5 Baud
ModulationPSK2A, PSK4A, PSK8A, PSK16A, ASK2PSK8, ASK4PSK16, 2DPSK2A; 8 tones
Additional InfoITA-5


CLOVER-2000 is an adaptive modulation system with ARQ that uses Reed-Solomon (RS) coding to achieve a remarkable performance even under worst HF propagation conditions. Data are modulated onto eight  tones spaced 250 Hz. The modulation rate of each tone is 62.5 Baud. The supported modulation techniques include binary phase-shift keying (PSK2A), quaternary PSK (PSK4A), 8-PSK (PSK8A), 16-PSK (PSK16A), binary amplitude-shift keying combined with 8-PSK (ASK2PSK8), quaternary ASK combined with 16-PSK (ASK4PSK16), and two-channel diversity binary PSK (2DPSK2A).

RS coding is utilized to correct transmission errors. Four coding levels (called RS Efficiency) are specified, which allow for more or less error correction within a block.

The level of RS Efficiency is automatically detected by the demodulator.

After successful synchronization, it may take several tens of seconds before any text is output in the GUI. The percentages in the following list of coding levels, relate the number of information symbols (user data) to the block length, a block comprises user data and parity check symbols:
  • ROBUST: 60%
  • NORMAL: 75%
  • FAST: 90%
  • OFF: 100% (i.e., no error correction)