Indicator, AZ-EL range IP-800/FPN-40
20-mile precision display.
f. Adjust the PRECISION SWEEP LENGTH control R1516 (Figure 29) to
position the 20-mile range mark (last intensified line) to correspond
with the last grid line on the right (Figure 31).
The last grid line to the right is approximately 1 inch
from the right edge of the CRT.
g. Rotate the grid line face plate to the position where the grid
lines are horizontal (Figure 22).