Wavecom W61PC V7.5.0 - Manual (Page 138)

128  Transmission Modes WAVECOM Decoder W61PC/LAN Manual V7.5
CIS-36-50
CIS-36-50, also known as BEE-36 or T600, is a synchronous system. Usually a 36 Bd idle sequence is
transmitted, followed by 50 baud traffic.
Parameter Value
Frequency range VLF, HF
Operation modes Simplex
Modulation FSK
Symbol rate 36, 50, 75, 100, 150 Bd
Shift 85, 125, 250 and 500 Hz, variable 50-3500 Bd
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
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-of-
transmission characters.
The length of a message is variable. If a transmission contains more than one message, the start of mes-
sage sequence is left out between messages.
Occasionally traffic with call signs in FSK CW is transmitted.
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 Simplex
Modulation FSK
Symbol rate 50 and 100 Bd
Shift 85, 125, 250 and 500 Hz, variable 50-3500 Bd
Receiver settings DATA, CW, LSB or USB
Input format(s) 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-of-
transmission characters.
The length of a message is variable. If a transmission contains more than one message, the start of mes-
sage 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.