Garmin G3X - Page 264

190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 20-30
Minimum Distance from Metal Tube Structure Requirements
Figure 20-31 shows minimum distance from metal tube structure requirements for internal, non-structural
mounting of the antenna. Table 20-7 presents minimum distance requirements between the tube structure
and the antenna for cases where the antenna sits underneath the fabric in a metal-tube structure aircraft.
Figure 20-31 illustrates the tube diameter (d) and minimum distance (l) references in the Table 20-7.
Figure 20-31 Example Teardrop Footprint Antenna Mounting Under Fabric Skin
.
Table 20-7 Minimum Distance Required Between Tube Structure and Antenna
Illustrated Case
Tube Diameter
d (in)
Minimum
Distance l (in)
Top of antenna at or above the center of the tube structure
(Figure 20-31, top)
0.625 3.6
0.75 4.3
1.00 5.7
1.25 7.2
Top of antenna between the center and bottom of the tube
structure (Figure 20-31, bottom)
0.625 7.2
0.75 8.6
1.00 11.5
1.25 14.3