g. Intercom signal. The modulation signal from the intercom is applied
to the J-3513/U J7 pin U through K7B to J1 pin D (Figure 71).
The audio
from the handset is applied through J5, through K7A and T1 transformer to J1
pin D (when used). (Trace these circuits on your system diagram.)
Figure 71. Modulation circuit, KY-57 turned ON,
cipher switch to C, cipher text.
80
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