Paradise 205486 REV F manual Typical System Configuration, IFL Cable Considerations

Models: 205486 REV F

1 124
Download 124 pages 61.17 Kb
Page 85
Image 85
9.5 Typical System Configuration

9.5 Typical System Configuration

This section shows the Compact Outdoor SSPB in a common system application. Figure 9-3 shows the Compact Outdoor used with a Paradise Datacom Evolution Series PD25 modem.

Indoor Equipment

Outdoor Equipment

IFL Cable

PARADISE

DATACOM

RS485 M&C

IF: 950 - 1450 MHz (-30 to -20 dBm ) at Compact Outdoor SSPB

Ref: 10 MHz (-5 dBm to +5 dBm) at Compact Outdoor SSPB

Figure 9-3: Compact Outdoor SSPB with PD25 Evolution Modem

9.6 IFL Cable Considerations

Consideration should be given to using a high quality IFL between the indoor equipment and Compact Outdoor SSPB. The system designer must always consider the total cable loss for a given length and also the implications of the slope of attenuation across the 950 to 1450 MHz bandwidth. Table 9-3 gives the approximate attenuation vs. frequency for a variety of cable types.

Table 9-3: Common Coaxial Cable Characteristics

Cable Type

Center

Outer

Attenuation at

Attenuation at

Slope across

Slope across

 

Conductor DC

Diameter

950 MHz

1450 MHz

band for 100

band for 300

 

Resistance per

(inches)

dB per 100 ft.

dB per 100 ft.

ft. cable (dB)

ft. cable (dB)

 

1000 ft.

 

 

 

 

 

RG-214

1.7

.425

7.8

11.3

3.5

10.5

 

 

 

 

 

 

 

Belden 8214

1.2

.403

6.8

9.2

2.4

7.2

 

 

 

 

 

 

 

Belden 7733

.9

.355

5.8

8.3

2.5

7.5

 

 

 

 

 

 

 

Belden 9914

1.2

.403

4.5

6.3

1.8

5.4

 

 

 

 

 

 

 

Belden 9913

.9

.403

4.2

5.6

1.4

4.2

 

 

 

 

 

 

 

It is recommended to use a quality grade of 50 ohm cable such as Belden 9913, 9914, or 7733. Check the manufacturer’s technical data to make sure that the insulation is sufficient for the particular installation including the cable’s temperature range. Also make sure the coaxial connector from the IFL cable to the Compact Outdoor input is wrapped with a weather sealing tape to prevent water intrusion into the coaxial cable.

Operations Manual, HPA2, Compact Outdoor SSPA

205486 REV F

85

Page 85
Image 85
Paradise 205486 REV F manual Typical System Configuration, IFL Cable Considerations, 3:Common Coaxial Cable Characteristics