User's Manual

LNA - Low Noise Amplifier
Two LNA, Low Noise Amplifiers, are located uppermost on the BSC board
in shielded covers. LNA/DL (downlink) is located to the left and LNA/UL
(uplink) to the right.
Received signals from the duplex filters are fed to the LNA input
connectors P122 (uplink) and P126 (downlink). The output signals from
the LNA amplifiers are fed to the next amplifier stages for uplink and
downlink on the BSC board.
The P123 and P127 ports are expansion outputs for additional BSC
boards (not used in the currently available single band repeaters).
Connection
The P122, P123, P126 and P127 ports are connected as shown on
page 5-11.
ANT
HI LO
ANT
LO
HI
DPX
MS
DPX
BS
P126 P127 P122 P123
P128 P121
LNA/DL
PA/DL
LNA/UL
PA/UL
P111
Figure 5-4. LNA, Low Noise Amplifiers
ALLGON Systems AB ALR Compact Repeater Functional Description
VD203 67/EN - User’s Manual Rev. 1A 2000-07 5 - 12