11
Installing the Coaxial Feed System
CAUTION
Do not use silicone grease on the O-rings, as this tends to dis-
solve the silicone O-ring. Use only a light lubricating coat of petro-
leum jelly; too much may hamper electrical contact and
contaminate the interior of the system.
Be very careful that each O-ring is seated in its groove and not
pinched between flange contact surfaces, as this will cause a leak
in the system and will be expensive to find and repair.
NOTE
Keep the hardware securing the plastic protectors. It will be used
for the final connections.
Installing the
Power-Divider-to-
Radiator Cables
The semiflex cables have been pre-formed at the factory and marked
for their respective locations. Use the markings to determine which
cables go where. Install the power-divider-to-radiator flex coaxial
cables as shown on the installation drawing. Follow these guidelines:
CAUTION
Be very careful to connect each power divider port to the correct
radiator.
CAUTION
The specific lengths of your flex cables are required to maintain
proper system phasing. Often cables will be longer than needed
merely to reach the antenna inputs. This is normal and necessary.
a. Remove the plastic protector from the coax flange. Don’t lose the
hardware or the O-ring.
b. Lubricate the O-ring lightly and insert it into the groove in the coax
flange.
CAUTION
Be sure each component’s inner conductor fits cleanly over the
mating component’s inner conductor connector. If any of the fin-
gers of the connector are forced outside the inner conductor (a
"split bullet"), this will cause arcing and damage to the antenna.
c. Use the hardware from the protective covers to attach the compo-
nents.
Table 2
shows torque specifications for the various size flange
bolts.
Figure 6
shows the flange bolt tightening sequence for each
coax size.
Table 2. Torque Specifications, Flange Bolts
Line Size
Bolt Size
Torque
1/2”
1/4-20
7 ft-lb
9 N-m
5/8”
1/4-20
7 ft-lb
9 N-m
7/8"
1/4-20
7 ft-lb
9 N-m
1-5/8"
5/16-18
12 ft-lb
16 N-m
Summary of Contents for 6017
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