Set The Lnb Skew Angle - KVH Industries M7 Installation Manual

16

Set the LNB Skew Angle

This step does not apply to linear systems with
Auto Skew capability.
If you are installing a linear system that does not
have Auto Skew capability, follow these steps to
set the antenna's LNB to the correct skew angle
for your selected satellite and vessel position.
a. Using HyperTerminal or KVH Flash Update
Wizard, type SKEWANGLE then press
Enter. Note the reported skew angle.
TIP: If multiple satellites are installed, you might
wish to set an average skew instead. To find the
average skew, select the second satellite then repeat
Step a to get the skew angle (repeat for the third
satellite if Tri-Sat). Add the skew angle numbers and
divide by two (or three if Tri-Sat) to get the average.
b. Turn off and unplug the receiver(s) and
disconnect antenna power at the switchplate.
CAUTION
Disconnect power from the antenna and the
receivers before you adjust the LNB. The
antenna's moving parts can cause injury.
c. Remove the antenna's radome, if you
reinstalled it earlier in Step 7.
d. Locate the LNB on the back of the antenna's
reflector (see Figure 32).
e. Using a 2 mm allen hex key, loosen the two
M4 socket set screws on the LNB choke feed.
These screws secure the LNB in place.
f. Adjust the LNB clockwise or counter-
clockwise until the skew arrow on the LNB
points to the skew angle that you noted in
Step a (see Figure 33).
IMPORTANT!
Be sure to keep the LNB fully inserted into the
choke feed to ensure optimum performance.
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 7d-e on page 9).
Figure 32: Set Screws Securing the LNB to the Reflector
M4 Socket
Set Screws
LNB
Figure 33: LNB Skew Angle Adjustment
LNB
0
Negative
Skews
0˚ Skew
Linear Systems
Reflector
Choke Feed
Positive
Skews
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