INTERNAL FREQ'S USED BY THE PHONE COMPANY (BLUE BOX)


1 = 700+900        2 = 700+1100
3 = 900+1100       4 = 700+1300
5 = 900+1300       6 = 1100+1300
7 = 700+1500       8 = 900+1500
9 = 1100+1500      0 = 1300+1500

ADDITIONAL SIGNALS REQUIRED FOR BLUE BOX

KP = 1100+1700 (KEY PULSE)

ST = 1500+1700 (START)

DISCONNECT = 2600

ALL FREQ'S ARE IN HZ.



US ARMY FREQUENCIES


1 = 2100+2300

2 = 2300+2500

3 = 1900+2700

4 = 1900+2100

5 = 2500+2700

6 = 2300+2700

7 = 2100+2500

8 = 1900+2300

9 = 2100+2700

0 = 1900+2500

ALL FREQS ARE IN HZ.



US. AIR FORCE FREQUENCIES


1 = 1020+1620

2 = 1020+1740

3 = 1020+1860

4 = 1140+1620

5 = 1140+1740

6 = 1140+1860

7 = 1260+1620

8 = 1260+1740

9 = 1260+1860

0 = 1380+1740

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