General Information
CIS-8181 is a modem used by the Soviet navy.
There is also a
variant called CIS 8129.
Usage:
§ Data communication over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
2 |
|
|
Shift (Hz) |
500 |
|
|
Bandwidth (Hz) |
600 |
|
|
Symbol rate (Baud) |
81 |
|
|
Encryption |
|
|
Demodulator Settings |
Demodulator |
FSK 2 matched |
|
|
Symbol rate (Bd) |
81 |
|
|
SR tolerance (Bd) |
5 |
|
|
Shift (Hz) |
500 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Synchronous |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding (raw output) |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 76: CIS-8181
Figure 27: CIS-8181 Spectrogram