Installation Instructions

D100300-
Doc. No.
Rev.
Date
D100300-REF
1.02
2012-10-09
Damm Cellular Systems A/S, Denmark
BS411 Base Station
Page 4 of 7
Antenna Interface, AI411.
The AI411 Antenna Interface unit is used in all Base Station (BS411and BS414) and contains
all the necessary circuit to support a complete Radio Cell including support of the Tower
Mounted Amplifier/Duplexer TMD412 with all functions.
The two independent RX multi-coupler amplifiers are built with low-noise high dynamic range
transistors. They have DC-insertion in the feeders for the TMA/TMD and alarm circuits to
monitor the TMA/TMD’s and the internal amplifiers´ current consumption. Included in the
input are variable input attenuators to adjust for actual cable loss.
An RF Power Detector is used to supervise the forward and reflected power at the TX
antenna connector. The detectors are temperature-compensated and the output levels can
be fine adjusted.
Receiver Multi-coupler Divider, RMD411.
The RMD411 divides the RXA and RXB signals and feed them to the receiver part of the
TR412
Figure 1
DAMM BS411 with text
Connection Box CON
Antenna Interface AI
Receiver Multicoupler Divider
RMD
Base Station controller BSC
Carrier units TR
Radio Frequency Test Loop
combiner RFTL
Power Supply units PS
Blower module
4-channel Transmitter Cavity
combiners TC