JRC JMA-9832-SA - Page 172

3 – 101
3 Checking Receiver System
The maximum range of the PM pattern on display indicates a fall of the sensitivity of the receiver
system.
Procedures of Checking
q Measure the maximum range rmax from the PPI center to the PM pattern on display using a
VRM (Variable Range Marker).
w Obtain a fall of sensitivity R (rmax) to the maximum range rmax referring to the Calibration
Curve II.
The value R (rmax) represents a current sensitivity fall in the receiver system.
Fig. 3
Calibration Curve II
Maximum range of PM pattern (rmax)
dB
0
0
2
4
6
8
10
12
14
16
1614
151312 17 18 (NM)
Sensitivity decline value R (rmax)
PERF. MONITOR
INFORMATION LABEL
DATE
BAR LENGTH