User's Manual

Page

Next Generation

Signal Enhancement

6.3. Block Diagram Description

The signals intercepted through the Donor antenna in the DL pass through

different devices for further signal processing.

Figure 15: Block Diagram DB6MR20 Repeater (3+3 Configuration)

(see separate document)

a. DONOR Antenna

Donor antenna of appropriate bandwidth & gain interfaces the BTS on one

side and repeater system on other side through RF cable. It is used to

receive signals from the base station and transforms electromagnetic

waves into RF signals in the DL and vice versa in the UL.

The antenna with no more than 10dBi to 12dBi gain transfers received

signals to the repeater and transmits uplink signals amplified by the

repeater.

Figure 16: A Typical Donor Antenna

b. Quad-plexers

Two Quad-plexers are equipped in the repeater, one on the BTS side &

other on the server side. The functions are:

• To isolate frequency bands corresponding to DL & UL paths

• To segregate frequencies corresponding to two service bands

equipped in DL & UL paths

Refer to Figure 15

c. Low Noise Amplifier (LNA)

This module is provided after each quad-plexer in the repeater before the

converter. The LNA provides compensation for the losses suffered by the