General Information
The American Standard Code for Information Interchange (ASCII) is a set of binary values to represent printable characters in electronic communication.
In the first version of the standard the character-length was 7 bit.
Usage:
§ Transfer of textual information over HF.
§ Processing, transfer and storage of textual information.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
2 |
|
|
Shift (Hz) |
173 |
|
|
Bandwidth (Hz) |
300 |
|
|
Symbol rate (Bd) |
100 |
|
|
Character |
1 Start-, 7 Data-, 1 Stop-Bit |
|
Demodulator Settings |
Demodulator |
FSK 2 matched |
|
|
Symbol rate (Bd) |
100 |
|
|
SR tolerance (Bd) |
5 |
|
|
Shift (Hz) |
173 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Synchronous |
|
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 37: ASCII 7 Bit
Figure 14: ASCII 7 Bit Spectrogram