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 message sequence is left out between messages.
Occasionally traffic with call signs in FSK CW is transmitted.