Setting polarization for the cradle-type radio

Setting polarization for the cradle-type radio

Calculating the radio polarization setting

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.

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 To calculate the radio polarization setting for a horizontal uplink /vertical downlink 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 / To calculate the radio polarization setting for a vertical horizontal downlink 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.

Chapter 5 • Installing a cradle-type radio assembly 1037312-0001 Revision A

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