Hughes AN6-098P, Installation Manual

Page: 63 / 98

Chapter 5 • Installing a cradle-type radio assembly
1037312-0001 Revision B
47
Setting polarization for
the cradle-type radio
To set polarization for the cradle-type radio, you adjust the radio,
not the antenna. This section explains how to calculate and set the
polarization value for the cradle-type radio assembly.
Calculating the radio
polarization setting
To calculate the polarization setting, refer to the section for the
type of uplink and downlink that will be used. In these
instructions, SBC initial value refers to the polarization value
calculated by the installation software.
For a horizontal
uplink /vertical downlink
To calculate the radio polarization setting for a horizontal
uplink / vertical downlink:
1. Multiply the SBC initial value by –1,
then offset the result by 90° as follows:
If the SBC initial value is positive, add 90.
If the SBC initial value is negative, subtract 90.
Example 1, positive initial value of 41°
41
×
–1 = –41
Add 90:
–41 + 90 = 49
Radio polarization setting = 49°
Example 2, negative initial value of –41°
–41 × –1 = 41
Subtract 90:
41 – 90 = –49
Radio polarization setting = –49°.
2. Make a note of the setting.
3. Go to Setting the radio polarization on page 48.
For a vertical uplink /
horizontal downlink
To calculate the radio polarization setting for a vertical
uplink / horizontal downlink:
1. Multiply the SBC initial value by –1 (with no offset).
Example 1, SBC initial value of 38°
38 × –1 = –38
Radio polarization setting = –38°.
Example 1, SBC initial value of 38°
–38 × –1 = 38
Radio polarization setting = 38°.
2. Make a note of the setting.
3. Go to Setting the radio polarization on page 48.