CALL LETTER TO PI CODE CONVERSION
		Letter 1	Letter 2	Letter 3	Letter 4
	ENTER CALL LETTERS:	K	X	K	T
		0	23	10	19
	PI Code Result:
	19923
	4DD3
	VALID US CALL LETTERS
	PI CODE TO CALL LETTER CONVERSION
		Char 1	Char 2	Char 3	Char 4
	ENTER PI CODE:	1	4	7	5
	1141
		0	1	17	23
	Call Letter Result:	K	B	R	X
	VALID PI CODE
	5237