Circular and Linear Versions. TracVision M5, M7 & M7SK Switchplate

TracVision M5/M7 User’s Guide

Chapter 1 - Introduction

Circular and Linear Versions

Your TracVision system is configured for either circularly polarized satellite signals (North America) or linearly polarized satellite signals

(Europe or Latin America).

Figure 1-2

illustrates the difference between these two polarizations.

Figure 1-2 Polarizations of Satellite Signals

Circular Linear

Signals transmitted in two

“corkscrew” patterns, one running clockwise and one running counter-clockwise

Signals transmitted in vertical and horizontal “waves” offset exactly 90º from each other

LNB Skew Angle

Since linear satellite signals are oriented in a precise cross pattern, the

TracVision antenna’s receiving element, called an LNB (low-noise block) must be oriented in the same way to optimize reception. This orientation adjustment is referred to as the LNB’s “skew angle.”

Figure 1-3

illustrates how skew determines the amount of signal the

LNB collects. The more signal, the better the reception.

Figure 1-3 How Skew Works

Bad Skew Good Skew Ideal Skew

= Satellite Signal = LNB "Signal Collector"

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TracVision M5/M7 User’s Guide

Chapter 1 - Introduction

The correct skew setting varies depending on your geographic location, since the orientation of your antenna to the satellite changes as you move. For example, as shown in the figure below, if your antenna is tracking the PAS 9 satellite for Sky Mexico programming, the ideal skew setting ranges from +30 to +70, depending upon your location within the satellite’s coverage area.

Figure 1-4 Approximate Skew Settings for the PAS 9 Satellite

+50 +45 +40 +35 +30

+55

+60

+65

+70

For complete details about adjusting the LNB’s skew, see

“Setting the

LNB Skew Angle (Linear Systems Only)” on page 27

.

TracVision M5/M7 User’s Guide

Chapter 2 - Operation

2. Operation

This chapter explains everything you need to know to operate the

TracVision system.

Contents

Receiving Satellite TV Signals ......................................... 11

Turning the System On/Off .............................................. 12

Changing Channels and Switching Between

Satellites.......................................................................... 13

Product Care.................................................................... 16

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