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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-24
When the warmup is complete, the system changes the mode field
from WAIT to STBY.
D TEST- This position selects the radar test mode. A test pattern is
displayed to verify that system operates. The green TEST legend
is displayed in the mode field. Refer to Section 4, Normal
Operation, for a description of the test pattern.
WARNING
UNLESS THE SYSTEM IS IN FORCED STANDBY, THE TRANSMIT-
TER IS ON AND RADIATING X-BAND MICROWAVE ENERGY IN
TEST MODE. REFER TO SECTION 6, MAXIMUM PERMISSI-
BLE EXPOSURE LEVEL (MPEL).
D WX - In this position, the radar system is fully operational and all
internal parameters are set for enroute weather detection.
If WX is selected before the initial RTA warmup period is complete, a
flashing WAIT legend is displayed. In WAIT mode, the transmitter
and antenna scan are inhibited and the memory is erased. When the
warmup is complete, the system automatically switches to the WX
mode and a green WX is displayed in mode field.
The system, in preset gain, is calibrated given in table NO TAG.
Rainfall Rate
Color
in/hr mm/hr
.04-.16 1-4 Green
.16-.47 4-12 Yellow
.47-2 12-50 Red
> 2 >5 0 Magenta
Rainfall Rate Color Coding
Table 3-6
D GMAP - Selecting GMAP places the radar system in the ground
mapping mode. The system is fully operational and all internal
parameters are set to enhance returns from ground targets. RCT
compensation is inactive.
WARNING
WEATHER TYPE TARGETS ARE NOT CALIBRATED WHEN
THE RADAR IS IN THE GMAP MODE. BECAUSE OF THIS, DO
NOT USE THE GMAP MODE FOR WEATHER DETECTION.