S9407-AB-HBK-010 Datasheet, PDF (128/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
6.8.1.1 Examples for Procedure 1
Example A
A 400-Hz power cable, type DSGU-75, is to be routed near a susceptible cable, type RG-
264A/U. The susceptible cable will carry signals in the passband 10 kHz to 80 kHz. The RG-264A/U
cable is connected to a radio receiver with a design performance sensitivity of -175 dBV. Because of
the physical layout of equipment, there is a spacing restriction on these cables of 15 inches.
PROCEDURE
1
STEP NO.
RESULTS AND
CALCULATIONS
1
R2-4 (radiator)
2
S1-1 (susceptor)
3
18 inches (spacing w/o shielding)
4
15 inches (available spacing)
5
S(dB) = 47 dB
6
V₃(dBV) = -175 + 47
= -128
7
3 (new group number)
8
10 inches (spacing with shielding)
9
Adequate shielding
NOTES
Table 6-1 and figure 6-1 (sheet 1)
Table 6-1, figure 6-4 (sheet 1), and figure
6-5 (note 3). V1(dBV) = -175.
Figure 6-6. Intersection of coordinates R2-
4 and S1-1.
Installation spacing restriction. Required
spacing in step 3 is greater than available
spacing in step 4; shielding of susceptor is
required.
Figure 6-7. Flexible conduit at 10 kHz
(passband is 10 kHz to 80 kHz).
V₃(dBV) = V₁(dBV) + S(dB)
Figure 6-5 (Note 4).
Cable designation is S1-3.
Figure 6-6. Intersection of coordinates R2-
4 and S1-3.
Shielding is adequate. Required spacing
in step 8 is less than available spacing in
step 4. The 10-inch spacing with shielding
must be maintained as a minimum spacing
requirement.
Reprinted without change
6-15