ASCII 7 Bit

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