User Manual

System Description NOTCHCELL Repeater
R-TRON Proprietary & Confidential Page 21
5.4 UDC for uplink
Figure 20 Block diagram of Up-Down converter unit for uplink
The above product is Down Converter for Uplink and it is composed of three parts (Down Converter, IF and Up
Converter)
Down Converter
Down Converter consists of RF level detector, BPF, Digital Atten, AMP and Analog Atten, Mixer. RF level
detector converts RF signal into DC, which is able to detect signal level. The first BPF removes signal out of
required bandwidth among the inputted signal from LNA and AMP compensates the loss from the first BPF.
Digital Atten, which is connected to Controller, operates to control Path Gain. Analog Atten is used for minute
control of Path Gain. Mixer converts RF into IF (IF-70MHz)
IF
IF is composed of Filter (LPF and SAW) and AMP. LPF removes Spurious signal which is higher passing band
and SAW Filter gets rid of unwanted signal which is out of required bandwidth. AMP compensates loss which
occurs when signal passing through Filter.
Up Converter
Up Converter consists of Mixer, AMP, BPF, Digital Atten, Analog Atten and RF level detector. Mixer is used to
convert IF (70 MHz) to Down Link Path RF Frequency. BPF is to remove signal out of service range. Digital
Atten operates connected to controller to control Path Gain.
LNA