User's Manual

CDMA REPEATER
quality(ρ value) of waveform that can take place during the conversion process of signals.
RF Block of Down Link Up/Down Converter as Down Link Gain Control Block phase performs
AGC and ALC functions to protect devices on over-input of CDMA RF Repeater, and with the
need of user it may turn On/Off the functions with automatic compensation function for gains on
temperature of system.
5.1.4 Filter
As cavity typed filter it is linked to Donor ANT of CDMA Repeater, which selectively passes the
wanted band among signals of BTS received with antenna that other bands are removed and
band to be served only can be input into LNA phase after acquiring enough Isolation between
Down Link and Up Link. And Up Link operates to minimize Spurious power occurred in PAU.
5.1.5 PAU(Power Amplifier Unit)
PAU considers Spurious features to apply degauss with credibility, endurance and high P1dB
and inspects at all times output by linking to system’s control part. So when main problem
happens, it can be reported to upper level and if required by the user PAU move can be On/Off.
Down Link PAU amplifies CDMA signal to proper output level and supply Control board with
VSWR information of output port and Repeater’s output level.
Also detect its own temperature and supply Control board with Device failure to check normal
operation state of Module.
5.1.6 Isolation Check Module
The output signals from the Down Link converter of the UP/DOWN converter module is coupled
to become an input of the isolation check module. Such signals find the maximum value and
minimum value by measuring a oscillation detection value while moving by 50KHz from -
250KHz to +250KHz of oscillation check frequency within the module.
When the difference between the maximum value and minimum value is 2dB greater than the
setting value, the gain is compensated as much as the difference, and when it is -2dB less than
the setting value, the gain is compensated as much as -0.5dB. Isolation is monitored and
controlled through such action.
5.1.7 Cabinet
Cabinet of Repeater has Die-Casting structure enabling constructed Module to set up to Door