l. Examine Figure 52.
This figure shows a properly aligned PPI
display in 10-mile range.
The start of the time base sweep should be centered on
the radar CRT as it was in the 40-mile presentation.
Once the start of the sweep is set, it should remain
centered for all PPI ranges.
PPI display 10-mile range.
m. In Figure 52, there are 10 intensified circles on the time
base sweep (range marks).
The tenth circle (10-mile range mark) is
approximately 1/8 inch from the edge of the CRT.
All range mark
rings are round in pattern.