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pin 7, also latches the flip-flop contained in U6, into drive state,
with a logic 0 (0 V) at U6 pin 3. If the Setup/Run Switch (Sl) is
in the Run position, if the input signals are high enough to trigger
QI, and if no ident signal is present to trigger Q3, the motor will
be activated with 14 V at U7 pin i0, and 0 V at U7 pin 6. DS2 will
light, and the motor will rotate to decrease the inductance of
coupler transformer T3.
Rotation will continue until the logic signals at pins 8 and 9 of
U3 differ, indicating that the antenna tuning has transitioned from
an inductive to a capacitive condition. The motor halts with the
U6 flip-flop reset until an out of tolerance condition is again
sensed.
74
Southern Avionics
SS-800AVS
Company
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