XPA2
| Enigma ID | XPA2 |
| Name | |
| Frequencies | |
| Status | Active |
| Voice | N/A |
| Emission mode | USB; 14-tone MFSK, 7.8125 Bd, 15.625 Hz |
| Location |
Moscow, Russia
|
| Activity pages |
XPA2 is a digital mode of the Russian 7 operator. It utilizes a custom 14-tone MFSK system.
Null format:
| 02196 | 00001 | 00000 | 34663 |
| 5-digit group with "0" in front |
5-digit group with "3" or "4" in front |
Traffic format:
| 09859 | 00194 | 83067 00308 ... 10077 24406 |
| 5-digit group with "0" in front |
Group count minus 3 padded to 5 digits |
5-digit single groups |
Multiple messages within a single transmission are separated using "00000 00000."
All XPA2 schedules are twice weekly and consist of 3 identical transmissions 20 minutes apart. Each successive transmission is 1-2 MHz lower or higher in frequency. The frequencies are typically changed on a monthly basis.