General Information
STANAG 4197 is a mode for the exchange of voice-data, which are coded according to the LPC10 (Linear Predictive Coding) standard, over a radio channel in a robust way.
Usage:
§ Military voice communication over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
QPSK |
|
|
Tones |
39 |
|
|
Shift (Hz) |
56.25 |
|
|
Bandwidth (Hz) |
2300 |
|
|
Symbol rate (Bd) |
2400 |
|
|
Data rate (bit/s) |
44.44 |
|
|
Error correction |
FEC |
|
Demodulator Settings |
Demodulator |
OFDM |
|
|
Symbol rate (Bd) |
44.444 |
|
|
No. of channels |
39 |
|
|
Channel distance (Hz) |
56.250 |
|
|
Constellation |
PSK 4A |
|
|
Min. burst length (s) |
0.200 |
|
|
Max. burst length (s) |
0.000 |
|
|
Min. pause length (s) |
0.050 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
|
Channel 16: Binary hex output |
yes |
|
Tuning |
The center frequency is 1800 Hz. | |
Table 16: STANAG-4197
Figure 17: STANAG-4197 Spectrogram
Modem Version History
|
Release |
Date |
History |
|
2.1.0 |
2013-07-31 |
Modem added |
|
2.2.0 |
2014-03-19 |
Modem updated |