Precautions and Preparation
2
Bay spacing
Special spacing example:
For an antenna at 99.3 MHz and 0.75 spacing:
11803 x 0.75 / 99.3 = 89.146 inches spacing; round to 89-1/8".
Bolt tightening
NOTE
Use an anti-seize compound to minimize galling on stainless steel
threads.
Table 1. Bay spacing chart
Frequency
"0.85-Wave"
Spacing
"Half-Wave"
Spacing
Special
Spacing
88 - 98 MHz
("Low-Band")
108 in
(2.74 m)
63-1/2 in
(1.61 m)
11803 x spacing
÷ frequency ;
round to closest
1/8"
98 - 108 MHz
("High-Band")
98 in
(2.49 m)
57 in
(1.45 m)
11803 x spacing
÷ frequency ;
round to closest
1/8"
Table 2. Torque specifications
Hardware size
Torque (dry)
Torque (lubricated)
1/4-20 (radome flanges)
75.2 in-lbf (8.5 N-m) 63.9 in-lbf (7.2 N-m)
5/16-18 (1-5/8" EIA flanges)
132 in-lbf (14.9 N-m) 112 in-lbf (12.7 N-m)
3/8-16 (3-1/8" EIA flanges)
236 in-lbf (26.7 N-m) 201 in-lbf (22.7 N-m)
