General Information
MIL-STD-188-110B-39Tone is a parallel mode which uses 39 orthogonal subcarrier tones in the audio frequency band with quadrature differential phase shift keying (QDPSK) modulation for bit synchronous data transmission. The modulation rate of the modulator output is constant for all data rates. The system supports data rates of 75 to 2400 bps.
Usage:
§ Data communication over HF between departments and agencies of the MOD.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
QDPSK |
|
|
Number of tones |
1 + 39 |
|
|
Bandwidth (Hz) |
2500 |
|
|
Symbol rate (Bd) |
44.44 |
|
|
Data rate (bit/s) |
75 … 2400 |
|
|
Coding |
Reed Solomon |
|
Demodulator Settings |
Demodulator |
OFDM |
|
|
Symbol rate (Bd) |
44.44 |
|
|
No. of channels |
39 |
|
|
Channel distance (Hz) |
56.250 |
|
|
Constellation |
DPSK-4B |
|
|
Min. burst length (s) |
0.200 |
|
|
Max. burst length (s) |
0.000 |
|
|
Min. pause length (s) |
0.050 |
|
|
0 | |
|
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’s frequency range | |
Table 14: MIL-STD-188-110B 39Tone
Figure 16: MIL-STD-188-110B 39Tone Spectrogram
Modem Version History
|
Release |
Date |
History |
|
2.0.0 |
2013-01-10 |
Modem added |