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- INTERNAL FREQ'S USED BY THE PHONE COMPANY (BLUE BOX)
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- 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
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- ADDITIONAL SIGNALS REQUIRED FOR BLUE BOX
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- KP = 1100+1700 (KEY PULSE)
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- ST = 1500+1700 (START)
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- DISCONNECT = 2600
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- ALL FREQ'S ARE IN HZ.
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- US ARMY FREQUENCIES
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- 1 = 2100+2300
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- 2 = 2300+2500
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- 3 = 1900+2700
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- 4 = 1900+2100
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- 5 = 2500+2700
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- 6 = 2300+2700
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- 7 = 2100+2500
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- 8 = 1900+2300
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- 9 = 2100+2700
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- 0 = 1900+2500
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- ALL FREQS ARE IN HZ.
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- US. AIR FORCE FREQUENCIES
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- 1 = 1020+1620
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- 2 = 1020+1740
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- 3 = 1020+1860
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- 4 = 1140+1620
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- 5 = 1140+1740
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- 6 = 1140+1860
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- 7 = 1260+1620
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- 8 = 1260+1740
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- 9 = 1260+1860
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- 0 = 1380+1740
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