Wavecom W61PC V7.5.0 - Manual (Page 175)

WAVECOM Decoder W61PC/LAN Manual V7.5 Transmission Modes  165
LINK-11 (CLEW)
Link-11 (CLEW: Conventional Link Eleven Waveform), also known as TADIL-A, is a transmission mode
mostly in HF band, to run a tactical digital information network. This mode is specified by the US Depart-
ment of Defense (DoD) in MIL-STD-188-203-1A (8
th January 1988).
Parameter Value
Frequency range HF
Operation modes Multi-carrier, DQPSK
Symbol rate 75 Bd or 45.45 Bd
Modulation 16-tone, DQPSK
Receiver settings USB
Shift/Bandwidth 2310 Hz
Center 1650 Hz
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
This mode has 16 carriers: one Doppler tone at 605 Hz; 14 data carriers starting at 935 Hz with tone dis-
tance of 110 Hz and the 16
th carrier at 2915 Hz is used for data and synchronization, see table below. Ex-
cept the Doppler tone, other carriers are DQPSK, modulated at the symbol rate of 75 or 45.45 Baud.
Number Frequency (Hz) Description Bit location
1 605 Doppler -
2 935 Data 0 and 1
3 1045 Data 2 and 3
4 1155 Data 4 and 5
5 1265 Data 6 and 7
6 1375 Data 8 and 9
7 1485 Data 10 and 11
8 1595 Data 12 and 13
9 1705 Data 14 and 15
10 1815 Data 16 and 17
11 1925 Data 18 and 19
12 2035 Data 20 and 21
13 2145 Data 22 and 23
14 2255 Data 24 and 25
15 2365 Data 26 and 27
16 2915 Data / Sync 28 and 29
There are 5 frame formats:
 DNCS IM: Data Net Control Station Interrogation Message
 DNCS IWM: Interrogation with Message
 PRM: Picket Reply Message
 SB: Short Broadcast