NorthStar 6000i Installation Manual page 49

APPENDIX B: Manual Tuning Procedure
MANUAL TUNING (Optional — for special situations only)
In the rare event that fully manual tuning is needed, the following procedure
can be used:
You can judge the echo strength either by observing the percentage return
value displayed below the menu key (the recommended way), or by watching
the dark green echoes on the screen. The percentage shows the fraction of the
screen covered by strong echoes.
Set the Tune mode key to Manual
Make an adjustment with the Tune key, and wait five seconds before
evaluating the change. If the echo is now stronger, make another adjustment
in the same direction. If weaker, try the other direction. As you get near the
peak, make small adjustments back and forth to find the maximum.
Finding a peak should not require more than a minute or two. Little can be
gained by continuing for more time than that.
Radar Installation Manual, Rev. E1 Page 45