Piccolo MK6

General Information

The Piccolo modes were developed in the UK for communications between Great Britain and its embassies and military stations all over the world. 
They are similar to the French Coquelet modes.

Usage:

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

Mode Details

 

Item

Value

Standard

Modulation

FSK

 

Number of tones

6

 

Shift (Hz)

20

 

Bandwidth (Hz)

180

 

Symbol rate (Bd)

20

 

Alphabet

ITA-2

Demodulator Settings

Demodulator

Multitone (MFSK)

 

Tone duration (ms)

50

 

TD tolerance (ms)

0.1

 

No. of tones

6

 

Tone position type

Equidistant frequencies

 

Tone distance (Hz)

20

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 168: Piccolo MK6

Figure 58: Piccolo MK6 Spectrogram