JRC JMA-7710-6 Instruction Manual page 120

3.3
Example : If it is assumed that the maximum range of the initial PM pattern, rBmax, recorded in the
Information Label is 16 NM and the maximum range of the current PM pattern, rAmax, is 14
NM, the value of decrease,
shows that the sensitivity of the receiving system has lowered by approx. 5 dB.
Example of checking the receiving system
P.M.FORM
dB
16
14
12
R(14) 10
8
∆r
6
R(16)
4
2
0
0 12
r(max) = 5 dB, can be obtained from calibration curve II, which
16NM
P.M.FORM
Calibration Curve II
13 14 15 16 17
rAmax rBmax
Maximum range of PM pattern, r max
3 – 61
ABOUT 14NM
PERF. MONITOR
INFORMATION LABEL
DATE P. MON
'95 1/20
18(NM)
8.0