Coquelet-80 – Wavecom W61PC V7.5.0 User Manual
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Transmission Modes
WAVECOM Decoder W61PC/LAN Manual V7.5
Parameter
Value
Frequency range
HF
Operation modes
Simplex
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
The first group of tones contains 8 tones (1 - 8) and the second group the tones 5 - 8. Tones 1 - 4 of the
second group are not defined.
Coquelet-8 is a synchronous system with a tone duration of 75.0 ms, 50.0 ms or 37.5 ms. One ITA-2
character is transmitted in 75 or 150 ms, which is equivalent to 50 or 100 Bd Baudot with 1.5 stop bits
(codeword length 7.5 Bit).
An IDLE sequence is sent when no traffic is at hand. Transmissions start with a synchronization preamble,
and end with several EOT characters.
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