Installation Instructions

24
Follow these steps to set the antenna’s linear LNB
to the skew angle you noted earlier.
a. Turn off and unplug the receiver(s).
b. Disconnect antenna power at the switchplate.
c. Remove the antenna’s radome, if you
reinstalled it earlier in Step 8e.
TIP: If you keep the radome topside, secure it with a
lanyard to prevent it from falling overboard.
d. Locate the LNB on the back of the antenna’s
reflector (see Figure 41).
e. Using a 2 mm allen hex key, loosen the two
M4 socket set screws securing the LNB to the
reflector (see Figure 42).
f. Adjust the LNB clockwise or counter-
clockwise until the skew arrow on the LNB
points to the skew angle you noted earlier
(see Figure 43).
If the skew angle is greater
than +15°, subtract 180 to get the equivalent
negative skew angle and set the LNB to that
angle instead (for example, +35 = -145).
g. Tighten the two M4 socket set screws to
secure the LNB in place. Apply 9 in-lbs
(1 Nm) of torque, if possible.
h. Reinstall the radome (as explained in
Steps 8e-f on page 10).
CAUTION
Disconnect power from the antenna and the
receivers before you adjust the LNB. The
antenna’s moving parts can cause injury.
Figure 41: LNB Location on Back of Antenna’s Reflector
LNB
Reflector
Reflector
M4 Socket
Set Screws
Figure 42: Set Screws Securing the LNB to the Reflector
Positive
Skews
Negative
Skews
0° Skew
LNB
S
K
E
W
Choke Feed
Figure 43: LNB Skew Angle Adjustment
Be sure to keep the LNB fully inserted into the
choke feed to ensure optimum performance.
IMPORTANT!
Set the LNB Skew Angle
16
Linear Systems Only