Aeroflex ATB-7300, Руководство по эксплуатации, Страница: 61 / 92

Test Set Operation
Subject to Export Control, see Cover Page for details.
2 - 44
2.5.2 Phase Screen
Fig. 2-52 Phase Screen
This plot shows the measured signal phase vs . time over the captured ELT signal.
Time is measured relative to the detected start of the ELT signal.
Measured phase should be zero for the first 160 ms (carrier-only signal), followed by
biphase-L phase-modulated data with a m odulation index of 1.1 radians.
Time controls at the bottom can be used to zoom in on specific parts of the signal.
St art ti me:
Sets the time (relative to the start of the ELT signal) when the plot starts.
Trace len gth :
Sets the length of time displayed on the plot.
Setting start time to 150 ms and trace length to 20 ms will zoom in on the beginning of
the phase modulation and the first few synchronization bits.