JRC JMA-7710-6 Instruction Manual page 119

Check of the receiving system
The maximum range of the PM pattern displayed on the screen represents the decrease in sensitivity of the
receiving system.
Checking procedures:
q
With regard to the PM pattern displayed on the screen, the maximum range rmax from the PPI center
using VRM.
w
Using calibration curve II, decrease in sensitivity corresponding to rmax, R (rmax), then the value of
R (rmax) represents the current decrease in sensitivity of the receiving system.
16
14
12
10
8
6
4
2
0
dB
Calibration Curve II
0 12 13 14 15
Maximum range of PM pattern, r max
3 – 60
16 17 18 (NM)
3.3
3