General Information
The radio reporting system, German “FunkMeldeSystem” (FMS), for agencies and organizations with safety assignments, German “Behörden und Organisationen mit Sicherheitsaufgaben” (BOS), is a radio communication system for security authorities and organizations.
Usage:
§ VHF security related communications.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation, primary, secondary |
FM, FSK |
|
|
Shift (Hz) |
600 |
|
|
Bandwidth (Hz) |
1800 |
|
|
Symbol rate (Bd) |
1200 |
|
|
Coding |
BCD and CRC |
|
Demodulator Settings |
Demodulator |
FSK 2,3,4 discr. |
|
|
Symbol rate (Bd) |
1200 |
|
|
SR tolerance (Bd) |
10 |
|
|
Modulation order |
2 |
|
|
Shift (Hz) |
600 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Synchronous |
|
|
Min. burst length (s) |
0.120 |
|
|
Max. burst length (s) |
1.200 |
|
|
Min. pause length (s) |
0.150 |
|
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 13: FMS-BOS
Figure 11: FMS-BOS Spectrogram