PICCOLO 12   



 British designed system based on sending 2 audio tones in sequence from a 

 selection of 12 for ITA-5 for each of the different characters to be sent. 

 Idle condition is tones 5 and 6 sent sequentially. 

 These two tones are the two center tones thus making tuning easy when the 

 station is in standby.  Two baudrates are transmitted namely 50 and 75 Baud

 but the system keys as if the input terminal equipment was 75 Baud all the 

 time by inserting idles whenever the transmit buffer gets empty (which it 

 will do quite often at 50 Baud in 75 Baud out).



 Tones used are No. 0 to 11 at 20 Hz apart for ITA-5 Ascii  



 Marklevel = 1 for USB, Marklevel = 0 for LSB.



 Tune on station's idle condition of tones 5/6 either side of center 'T'



 Because it is impossible to know which sequence of two tones is the 

 character, two decodes are printed to the screen.  One will be garbled, one 

 clear.  If the station is sending crypto (which a lot of them do) then of 

 course both decodes will be garbled - but that's not our fault!