Coquelet-8 – Wavecom W74PC V8.7.0 User Manual
Page 159
WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
Transmission Modes
149
Tone Assignment of COQUELET-13:
Tone Number
Frequency Hz
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
First tone Group
1
812
1
1
1
2
842
1
1
3
872
1
4
902
1
5
932
1
1
6
962
1
1
7
992
1
8
1022
9
1052
Idle or start tone
Second Tone Group
10
1082
1
1
11
1112
1
12
1142
1
13
1172
COQUELET-8
COQUELET-8 is an MFSK (Multiple Frequency Shift Keying) system, and like the PICCOLO system trans-
lates an ITA-2 character into a sequence of two tones.
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.