Huawei ETS2000 Series Maintenance Manual page 23

baseband
MSM
6000
RFT6120
RFLO
RFT6120 internal component
3. RF tracing unit
The main unit function is to provide RF local oscillation signals for transceiver. The
RF duplex interval is 45MHz. Therefore, we design the RF oscillator to be shared
by both receiving and transmitting operations. For both receiving and transmission
operations, the RF local oscillator is high. The reference clock signal frequency is
19.2MHz and the phase detection frequency is 25KHz. The Rx PLL circuit is
integrated into RFT6120, but RX VCO and RX LO are still in RFR6120.See Figure
1-27 for the unit.
RF part
SAW
855923
Peripheral RF device
Figure1-25
RF emission unit
23
SKY
ISOL
77105
ATOR
PA isolator
duplexer