2 - 1 8

O v e r v i e w

Tilt Selection

To use the tilt selection charts, first determine the system operating bandwidth, either 750 MHz or 870 MHz. Next, determine the desired system channel load either 77, 94, or 110 channels. Use the corresponding bandwidth and channel loading chart to determine the preferred tilt, either low, standard, or high.

Figure 2-11 illustrates the tilt selection chart for 750 MHz bandwidth and 77-channel load:

Figure 2-11

Relative level dB versus 750 MHz slope 77 channels

SG2 750 MHz Slope Chart

77 Analog Channels, 200 MHz Digital

 

14

 

 

 

 

 

 

 

 

13

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

dB

9

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

level,

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

elative

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

-1

 

 

 

 

 

 

 

 

-2

 

 

 

 

 

 

 

 

-3

 

 

 

 

 

 

 

 

50

150

250

350

450

550

650

750

Frequency, MHz

Low

Standard

High

SG 2000 Installation and O peration Manual

Page 31
Image 31
Motorola SG 2000 operation manual Tilt Selection, Relative level dB versus 750 MHz slope 77 channels