Feeders and Jumpers

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Feeders and Jumpers

The feeders and jumpers are used to connect the antenna to the base station. They are of three types: 1/2" jumper, 7/8" feeder, and 5/4" feeder. • The jumper is supple but has a high loss. It is used in short-distance cabling between the TMA and the antenna and between the TMA and the feeder. • The feeder is rigid but has a low loss. It is used in long-distance cabling. Figure 1 shows the locations of the feeder and jumpers in the antenna system of a base station. Figure 1 Cable connection in the antenna system

(1) Antenna

(2) Jumper

(4) Feeder

(5) Cabinet

(3) TMA

• Jumper The jumpers are installed between the antenna and the TMA, between the TMA and the feeder, between the feeder and the base station.

If...

Then...

The jumper is located between the antenna and the

Its predefined length is 2.5 m [8.20

TMA,

ft].

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If...

Then...

The jumper is located between the TMA and the feeder, Its predefined length is 1.5m [4.92 ft]. If the distance between the antenna and the base station is shorter than 14 m [45.92 ft], you may use the jumper to connect the antenna and the base station. In this case, the antenna and the base station can be connected by the 1/2" jumper. • Feeder There are two types of feeders: 7/8" and 5/4". The feeder type depends on the distance between the antenna and the base station. Table 1 Feeder types and cabling distances

Macro base

Frequency band

station

(MHz)

GSM

900

1800

CDMA

450

800

1900

UMTS

1900/2100

7/8" feeder

5/4" feeder

Equal to or shorter than 80 m

Longer than 80 m

[262.46 ft]

[262.46 ft]

Equal to or shorter than 50 m

Longer than 50 m

[164.04 ft]

[164.04 ft]

Equal to or shorter than 110 m Longer than 110 m [360.89 ft]

[360.89 ft]

Equal to or shorter than 80 m

Longer than 80 m

[262.46 ft]

[262.46 ft]

Equal to or shorter than 50 m

Longer than 50 m

[164.04 ft]

[164.04 ft]

Equal to or shorter than 50 m

Longer than 50 m

[164.04 ft]

[164.04 ft]

CAUTION: If a two-port dipole antenna is shared by two frequency bands, select the feeder type that requires a shorter cabling distance. Based on the acquisition of the base station information, all projects are classified into two types:


Type A: The network planning has been performed for the project. Table 2 shows the design principles of the feeder length for Type A projects.

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Type B: The network planning has not been performed for the project. Table 3




shows the design principles of the feeder length for Type B projects. Table 2 Design principles of the feeder length for Type A projects

Tower

Base station

Average distance between

Length of a single

the tower/pole and the

feeder

cabinet Tower or pole at

Outdoor base

the top of a roof

station

10 m

Height of the tower or pole at the top of the roof + 10 m

Indoor base

25 m

station

Height of the tower or pole at the top of the roof + 25m

Tower on the

Outdoor base

ground

station Indoor base

8m

8m 12 m

station Unknown

Unknown

Height of the antenna +

Height of the antenna + 12 m

Unconfirmed

Height of the antenna + 10 m

Table 3 Design principles of the feeder length for Type B projects

Macro base

Frequency

station

band (MHz)

GSM

CDMA

UMTS

Length of a single feeder

Feeder

900

45 m

100% 7/8"

1800

40 m

80% 7/8" + 20% 5/4"

450

45 m

100% 7/8"

800

45 m

100% 7/8"

1900

45 m

80% 7/8" + 20% 5/4"

1900/2100

40 m/60 m

80% 7/8" (40 m) + 20% 5/4" (60 m)

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