WAVECOM Decoder W-PCI/e, W-CODE, W

CIS-50-50

CIS-50-50 is very similar to CIS 36-50, but uses different baud rates and shifts.

Parameter Value

Frequency range VLF, HF

Operation modes

Modulation

Symbol rate

Shift

Receiver settings

Input format(s)

Simplex

FSK

50 and 100 Bd

85, 125, 250 and 500 Hz, variable 50-3500 Bd

DATA, CW, LSB or USB

AF, IF

Idle dot reversals are transmitted at 50 Bd, followed by traffic in 50 baud (more rarely in 100 Baud).

All traffic is encrypted.

A message begins with a bit synch sequence and a start-of-message preamble. Message data is sent with a 7-bit, 3:4 ratio alphabet, and ends with an end of transmission sequence containing at least 4 end-oftransmission characters.

The length of a message is variable. If a transmission contains more than one message, the start of message sequence is left out between messages.

Occasionally traffic with call signs in FSK CW is transmitted.

CLOVER-2

CLOVER-2 is an adaptive modulation system with ARQ and FEC (broadcast) modus. It uses Reed-Solomon

(RS) coding to achieve a remarkable performance even under poor HF propagation conditions.

Parameter Value

Frequency range

Operation modes

Modulation

Symbol rate

AFC

Receiver settings

Input format(s)

HF

Half-duplex ARQ

PSK2A, PSK4A, PSK8A, PSK16A, ASK2PSK8, ASK4PSK16, 2DPSK2A

4 tones

4 x 31.25 Bd

±200 Hz, with max. single step ±10 Hz.

DATA, CW, LSB or USB

AF, IF

Additional Info ITA-5, Optional Mode

Data is modulated onto four tones spaced 125 Hz. The modulation rate of each tone is 31.25 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).

CLOVER-2 frame includes CCB (Clover Control Block) and data block with variable lengths and modulations. Each data block is displayed immediately after receiving. The decoder status indicates “TRAFFIC”.

When a CCB is received, the decoder status switches to “IDLE”. The content in a CCB is displayed only when call sign or text is available. The call sign is displayed in the status line and the short text is displayed in the main window.

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 percentages in the following list of coding

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Transmission Modes WAVECOM Decoder W-PCI/e, W-CODE, W-CLOUD Manual V8.3.00

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)

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

Important parameters of a data block or a CCB are displayed in the decoder status bar. The modulation is displayed in Format, the block length and RS code efficiency are displayed in RS Code. The display Car-

rier shows the center frequency of the current block after tracking.

Using Options | CRC Table a certain CRC mask can be defined, see “ CRC Table ” on page 34.

The Options | Display Mode provides the options to display All Frames or Error free Frames, which means frames with the correct CRC check.

CLOVER-2000

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 Bd. 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).

Parameter Value

Frequency range

Operation modes

Modulation

HF

Half-duplex ARQ

PSK2A, PSK4A, PSK8A, PSK16A, ASK2PSK8, ASK4PSK16, 2DPSK2A

8 tones

Symbol rate

AFC

Receiver settings

Input format(s)

Additional Info

8 x 62.5 Bd

±400 Hz, with max. single step ±15 Hz

DATA, CW, LSB or USB

AF, IF

ITA-5, Optional Mode

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 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)

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

After successful synchronization, it may take up to a minute before any text is output in the GUI.

Using Options | CRC Table a certain CRC mask can be defined, see “ CRC Table ” on page 34.

The Options | Display Mode provides the options to display All Frames or Error free Frames, which means frames with the correct CRC check.

WAVECOM Decoder W-PCI/e, W-CODE, W-CLOUD Manual V8.3.00 Transmission Modes

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