Coquelet-80 – Wavecom W74PC V8.7.0 User Manual
Page 160
150
Transmission Modes
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
Tone Assignment of COQUELET-8:
Tone Number
Frequency Hz
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
First tone Group
1
773
1
1
1
2
800
1
1
3
826
1
4
853
1
5
880
1
1
6
907
1
1
7
933
1
8
960
Second Tone Group
5
880
1
1
6
907
1
7
933
1
8
960
COQUELET-80
COQUELET-80 is a synchronous MFSK system with error correction (FEC). Various references note two dif-
ferent systems: COQUELET-80S and COQUELET-82S. COQUELET-82S can be used in both side bands and
uses extended handshaking and synchronizing sequences (extended protocol).
Parameter
Value
Frequency range
HF
Operation modes
Simplex FEC
Modulation
MFSK-8
Speed
37.5, 50.0 or 75.0 ms
Receiver settings
DATA, CW, LSB or USB
Input format(s)
AF, IF
Additional Info
ITA-2
COQUELET-80 is used with the ATU-80 (Arabic) or the ITA-2 (Latin) alphabet. As for COQUELET-8 a char-
acter is coded with two tone assignments from group 1 and group 2.
Error correction is done by transmitting every character twice with a specified time offset. The second
transmitted character is mathematically reformatted (MOD 8). The leading (DX) and trailing characters
(RX) always have the same ODD or EVEN parity.
At the beginning of a message the RX character positions are filled with IDLE sequences. This mode does
error recognition, but no error correction.