User Manual

System Description NOTCHCELL Repeater
R-TRON Proprietary & Confidential Page 21
Figure 21 Block diagram of Low Noise Amplifier unit for downlink.
This product is a low noise amplifier used for NOTCHCELL downlink. It is generally composed of RF block
and Fault block (Alarm circuit). RF block has approximately 30dB gain at CDMA1900 through 3-stage
amplification, and its noise index is 0.9dB. Fault block is a circuit that detects current flowing in each TR of RF
block. Fault circuit detects current flowing in 1
st
stage TR and 2
nd
& 3
rd
stage TRs. If TR current is less or more
than set value due to the change of LNA environment, it generates TTL signal (5V).
Connection
Port Connected to
RF IN UL on the DPX-MS.
RF OUT RF IN on the PA-UL unit.
CON On the ARCU board
CON On the PSU unit.
Specification
Item Specification Remarks
Frequency 1850MHz ~ 1865MHz
Bandwidth 15MHz
Gain
34~59dB
± 0.5dB
Att. : 25dB
Voltage DC 12V
RF connector Type-SMA, female