Antenna Size And Impact On Tilt Management; Rules Of Thumb - Honeywell PRIMUS 660 Pilot's Manual

R
PRIMUS 660 Digital Weather Radar System
D
The antenna size used on the aircraft alters the best tilt settings by
about 1_. However, tilt management is the same for either size, as
shown in figure 5–16.

Antenna Size and Impact on Tilt Management

NOTE: The 10– and 24–inch antennas are shown for illustration
purposes only.
D
Some of the rules of thumb are described below and shown in figure
5–17.
- A 1_ look down angle looks down 100 ft per mile.
- Bottom of beam is 1/2 beam width below tilt setting.
- A 12–inch antenna grazes the ground at 100 NM if set to 0_ tilt
at 40,000 ft.
Radar Facts
5-14
Figure 5–16
TILT

Rules of Thumb

Figure 5–17
BEAM WIDTH
AD–35702@
A28–1146–111
AD–46703@
REV 2