JRC JMA-9832-SA Instruction Manual page 173

Example
Assuming that the maximum range of the initial PM pattern is rBmax = 18 NM according to the
INFORMATION LABEL, and if that of the current PM pattern is rAmax = 16 NM, the fall value
is -R (rmax) = 5 dB, referring to Calibration Curve II.
This means that the receiving system has a sensitivity fall of approx. 5 dB.
Example of Checking Receiption System
Initial PM pattern
16
14
12
10
8
6
4
2
0
0
18NM
Current PM pattern
dB
Calibration Curve II
12 13 14 15
PM pattern maximum range (rmax)
Fig. 4
3 – 102
3.4 BASIC OPERATIONS
PERF. MONITOR
INFORMATION LABEL
DATE BAR LENGTH
16 17 18 (NM)
rAmax rBmax
. ..
Approx. 16 NM
3