Coquelet-80

General Information

The Coquelet modes were designed for the communications of French customs and police authorities. They are similar to the British Piccolo modes.
Coquelet-80 is the extension of Coquelet-8 by FEC.

Usage:

§ Transfer of textual information (mostly encrypted) over HF.

Mode Details

 

Item

Value

Standard

Modulation

FSK

 

Number of tones

8

 

Shift (Hz)

26.67

 

Bandwidth (Hz)

300

 

Symbol rate (Baud)

13.3 / 26.7

 

Alphabet

ITA-2 /  ATU-80

Demodulator Settings

Demodulator

Coquelet

 

Tone duration (ms)

37.5

 

TD tolerance (ms)

2

 

No. of tones

8

 

Tone spacing (Hz)

26.67

Features

Demodulation

yes

 

Recognition

yes

 

Decoding

yes

 

Automatic Polarity Adjustment

yes

 

Combination with other modems (modem list)

yes

Tuning

The tuning frequency is the center of the signal

Table 99: Coquelet-80

Figure 35: Coquelet-80 Spectrogram