General Information
Codan 3012 mode is a proprietary standard developed by
CODAN PTY Australia. Codan 3212 is similar to the Codan 3012 mode with same
modulation parameters but slightly different encoding parameters.
The Codan
3212 modem also
supports decoding of the Codan 3012 mode.
Usage:
§ ARQ and broadcast data communication over HF.
§ ALE
Mode Details
|
|
Item |
Value |
|
Standard ALE |
Modulation |
PSK |
|
|
Number of tones |
2 |
|
|
Number of channels |
32 |
|
|
Channel spacing (Hz) |
80 |
|
|
Bandwidth (Hz) |
2560 |
|
|
Symbol rate (Bd) |
80 |
|
|
Coding |
Golay code |
|
Standard Data |
TX modus |
selective, broadcast, group call |
|
|
Modulation |
DPSK |
|
|
Number of tones |
4 |
|
|
Number of channels |
4,8,12,16 |
|
|
Channel spacing (Hz) |
112.5 |
|
|
Bandwidth (Hz) |
1800 |
|
|
Symbol rate (Bd) |
1200 |
|
|
Data rate (bit/s) |
up to 6000 |
|
|
Alphabet |
CCIR-476 |
|
Demodulator Settings ALE |
Demodulator |
MDPSK 2,4,8,16 A/B |
|
|
Symbol rate (Bd) |
80 |
|
|
SR tolerance (Bd) |
5 |
|
|
Modulation order |
2 |
|
|
Version |
A |
|
|
No. of channels |
32 |
|
|
Channel position type |
Channel distance |
|
|
Channel distance (Hz) |
80 |
|
Demodulator Settings Data |
Demodulator |
MDPSK 2,4,8,16 A/B |
|
|
Symbol rate (Bd) |
75 |
|
|
SR tolerance (Bd) |
2 |
|
|
Modulation order |
4 |
|
|
Version |
A |
|
|
No. of channels |
16 |
|
|
Channel position type |
Channel distance |
|
|
Channel distance (Hz) |
112.5 |
|
|
Min. burst length (s) |
0.700 |
|
|
Max. burst length (s) |
12.000 |
|
|
Min. pause length (s) |
0.070 |
|
|
9 | |
|
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 85: Codan 3012 ALE
Figure 30: Codan 3012 ALE Spectrogram
Figure 31: Codan 3012 Data Spectrogram