User's Manual

converted to TTL by U34. The U38 output latch directs activity of the TACAN antenna controller after the
U38 latch signals are converted to RS422 by U35 and U36. The U38-19 loop-back signal may be used for
fault-isolation purposes to buffer U37-9. Latch U38-16 also controls ~TACAN_RESET though transistor
Q5 and TVS diode CR42 before routing to P1-C8.