Lesson 3/Learning Event 6
b. Jackfields. A simplified full-duplex teletypewriter system passing
through the AN/MSQ-73 is illustrated in figure 3-14. One send (SEND) and
one receive (REC) jackfield are included. Relay operation is incorporated
because the incompatible 60-ma circuits must be electrically isolated.
Each relay assembly contains two sections, one for each direction of
transmission in a full-duplex circuit.
The front panel of the relay
assembly contains jacks to measure line and bias currents, as well as
variable resistors to control and adjust these currents.
Principles of DC Jack Circuits in the AN/MSQ-73.