PRIMUS
r
880 Digital Weather Radar System
A28- 1146- 102- 00
Operating Controls
3-9
10
BRT (Brightness) or BRT/LSS (Lightning Sensor System)
The BRT knob is a single- turn control that adjusts the brightness of the
display. Clockwise (cw) rotation increases display brightness and
counterclockwise (ccw) rotation decreases brightness.
An optional BRT/LSS four- position rotary switch selects the separate
LSZ- 850 Lightning Sensor System (LSS) operating modes and the
brightness control on some models. Its LSS control switch positions are
as follows:
D
OFF
- This position removes all power from the LSS.
D
SBY (Standby)
- This position inhibits the display of LSS data, but
the system accumulates data in this mode.
D
LX (Lightning Sensor System)
- In this position the LSS is fully
operational and data is being displayed on the indicator.
D
CLR/TST (Clear/Test)
- In this position accumulated data is cleared
from the memory of the LSS. After 3 seconds the test mode is
initiated in the LSS. Refer to the LSZ- 850 Lightning Sensor System
Pilot’s Handbook, for a detailed description of LSS operation.
11
TILT
The TILT knob is a rotary control that is used to select the tilt angle of
the antenna beam with relation to the horizon. CW rotation tilts beam
upward to +15
_
; ccw rotation tilts beam downward to - 15
_
.
A digital readout of the antenna tilt angle is displayed on the CRT, with
0.5
_
resolution.
D
PULL ACT (Altitude Compensated Tilt) Function
- When the
TILT control knob is pulled out, the system engages the ACT. In ACT
the antenna tilt is automatically adjusted with regard to the selected
range and barometric altitude. The antenna tilt automatically
readjusts with changes in altitude and/or selected range. In ACT, the
tilt control can fine tune the autotilt setting by
±
2
°
.
ACT is annunciated with an
A
following the digital tilt readout. The
digital tilt readout always shows the commanded tilt of the antenna
regardless of the tilt command source (ACT command or manual tilt
command).
WARNINGS
1.
TO AVOID FLYING UNDER OR OVER STORMS,
FREQUENTLY SELECT MANUAL TILT TO SCAN BOTH
ABOVE AND BELOW YOUR FLIGHT LEVEL.
2.
ALWAYS USE MANUAL TILT FOR WEATHER ANALYSIS.
Summary of Contents for Primus 880
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