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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 3-3
Operating Controls
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.
As a constant reminder the GMP is selected, the alphanumerics are
changed to green, the GMP legend is shown in the mode field, and the
color scheme is changed to cyan, yellow, and magenta. Cyan
represents the least reflective return, yellow is a moderated return, and
magenta is a strong return.
If GMP is selected before the initial RTA warmup period is complete, the
white WAIT legend is shown in the mode field. In wait mode, the
transmitter and antenna scan are inhibited and the memory is erased.
When the warmup period is complete, the system automatically
switches to the GMP mode.
GMP can only be selected when the function switch is in the ON
position.
3 RCT (RAIN ECHO ATTENUATION COMPENSATION
TECHNIQUE (REACT))
The RCT switch is an alternate–action switch that enables and
disables REACT.
The REACT circuitry compensates for attenuation of the radar signal
as it passes through rainfall. The cyan field indicates areas where
further compensation is not possible. Any target detected within
the cyan field cannot be calibrated and should be considered
dangerous. All targets in the cyan field are displayed as fourth level
precipitation, magenta.
REACT is available in the WX mode only, and selecting REACT forces
the system to preset gain. When engaged, the white RCT legend is
displayed in the REACT field.
NOTES: 1. REACT’S three main functions (attenuation
compensation, cyan field, and forcing targets to
magenta) are switched on and off with the RCT switch.
2. Refer to Section 5, Radar Facts, for a description of
REACT.