General Information
The asynchronous Baudot mode is a means to transfer printable characters over a communication channel. Synchronization in this case is achieved by the use of a Start-Bit, which has the polarity reverse to the Stop-Bit and the Idle-State.
Usage:
§ Transfer of textual information over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
2 |
|
|
Shift (Hz) |
450 / 850 |
|
|
Bandwidth (Hz) |
800 / 1500 |
|
|
Symbol rate (Bd) |
50 / 75 / 100 |
|
|
Character |
1 Start-, 5 Data-, 1/1.5/2 Stop-Bit |
|
Demodulator Settings |
Demodulator |
FSK 2 matched |
|
|
Symbol rate (Bd) |
50 |
|
|
SR tolerance (Bd) |
5 |
|
|
Shift (Hz) |
450 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Asynchronous |
|
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 46: Baudot async
Figure 17: Baudot async Spectrogram