User Manual
Table Of Contents
- 1. Document History
- 2. Disclaimer
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- 3. Safety Instructions and Warnings
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- 4. Introduction
- 5. Functional Description Of R4 Band Selective Repeater
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- 6. To Get started-Basic Software Control Of the Repeater
- 7. R4 Repeater Specifications
- 8. Installation
- The gain of repeater is set using software control through local USB serial port or optional wireless modem
- 9. System Maintenance
Next Generation
Signal Enhancement
a. DONOR Antenna
Donor antenna of appropriate bandwidth & gain interfaces the BTS on
one side and repeater system on other side through RF cable.
Figure 11: Donor Antenna (Patch Panel)
It intercepts signals from the base station and switch electromagnetic
waves into RF signals in the DL and vice versa in the UL. The antenna
with more than 10-12 dB gain transfers intercepted signals to the
repeater and transmits uplink signals amplified by the repeater.
b. Duplexer
The main function of duplexer is to isolate the uplink frequency from the
downlink frequency, i.e. isolate transmit path from receive path. Two
duplexer units are provided in the repeater, one in the Donor antenna
side and other in the server antenna side. Each duplexer
transfers/receives signals from respective antenna for further connectivity
to low noise amplifier. The bandwidth of the duplex filter depends on the
operator’s frequency band (18MHz, 15MHz, 10MHz, 9MHz, or full
Band etc.).
c. Low Noise Amplifier (LNA)
This module is provided after duplexer before the converter. The LNA
provides compensation for the losses suffered by the stream of weak
signals as it passes through splitter/combiner & duplexer (passive
devices). Two LNAs are provided, one each in the UL & DL directions.
d. Converter Module
The basic block of converter module comprises of L.O. frequency mixer,
filter and intermediate amplifier. The low noise amplified signals are
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