General Information
CIS-36 is a modem used by the Soviet military and diplomatic services.
This modem system is also known as CROWD 36.
Usage:
§ Data communication over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
MFSK |
|
|
Number of tones |
36 |
|
|
Tone spacing (Hz) |
40 |
|
|
Bandwidth (Hz) |
2000 |
|
|
Symbol rate (Baud) |
40 |
|
|
Encryption |
|
|
Demodulator Settings |
Demodulator |
Multitone (MFSK) |
|
|
Tone duration (ms) |
25 |
|
|
TD tolerance (ms) |
2.5 |
|
|
No. of tones |
36 |
|
|
Tone position type |
Equidistant frequencies |
|
|
Tone distance (Hz) |
40 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 67: CIS-36
Figure 24: CIS-36 Spectrogram