1-17. Electronic Assembly Tracking Test Functional Description (fig. 1-9)
a. MODE switch S1 provides the scan mode commands to the electronic assembly.
b. The MLO signal is applied to the circuit card and Σ AT switch S11 connects the FO signal to the circuit card
causing the coding the tracking signals to be generated.
c. Σ AT CODING/TRACKING switch S12 selects the coding or tracking signal and applies it to another section of
the circuit card to cause the Σ AT signal to be generated.
d. The LED PRF is applied to the circuit card for proper timing of the Σ AT signal and is also made available for
monitoring at the LED PRF jack (J40).
e. The RESET switch S13 resets and starts the circuits that generate the azimuth and elevation outputs as well as
the Σ AT output.
f. TRACKING FILTER switch S15 selects the azimuth and elevation outputs and directs them to the electronic
assembly as the port, starboard, up, and down signals simulating the receiver servo output tracking patterns.
g. The pilot track discrete causes TRACK lamp DS7 to come on indicating that the system is in the track mode.
h. The electronic assembly azimuth and elevation signals to be monitored are selected by the DVM/SCOPE
switch S3 and are monitored at the ELECT SCOPE jacks.