User's Manual Part 2

RBS 2308 and RBS 2309 User’s Guide

Attenuation, dB/m (CABLE LOSS)

Feeder Type

Andrew

Velocity

Factor

(PROP

VEL)

GSM

800

GSM

900

GSM

1800

GSM 1900

3/8-in. FSJ2 (flex)

0.83 0.121 0.127 0.185 0.191

1/2-in. LDF4

0.88 0.066 0.069 0.101 0.104

1/2–in. FSJ4 (flex)

0.81 0.107 0.112 0.166 0.171

7/8-in. LDF5

0.89 0.037 0.039 0.058 0.060

1 1/4-in. LDF6

0.89 0.027 0.028 0.042 0.043

1 5/8-in. LDF7

0.88 0.022 0.023 0.035 0.036

Note: If the cable type is not found in the table above, the values must be

taken from the manufacturer’s specifications.

6.3 Performing DTF Tests

The purpose of the Distance To Fault (DTF) test is to verify that there are no

bad connections or other faults (for example sharp bends) in the feeder system.

It also measures the length of the feeder system to be used in the feeder

attenuation calculation.

It is recommended to perform the DTF tests during the installation phase,

before the antennas are connected.

6.3.1 Connecting DTF Test Setup

This section contains test setups and information about how to connect the test

equipment for the DTF tests.

1. Connect the 50 standard load to the antenna connector of the feeder.

See figure below.

2. Connect the test equipment to the RBS jumper. See figure below.

/LZT 720 0027 Uen R8A 2006-06-27