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50m (through two closed doors, hall onto street) or so transmission (scrying_tech_notes#5)

secret is to send alternating 1s and 0s as stream (170) with code (133) in the middle:

  beginSerial(BAUD);
  while(1){
    x++;
		      serialWrite(170);

		      if (x>=55) {
		       PORTC|= (1<<PC5);
		       serialWrite(133);
		       x=0;
		      }