BHE 1:2 Q-Band LNA system
The BJES10 Q-band Redundant LNA system
The BJES10 Q-band Redundant LNA system from Milexia partners BHE (Bonn Hungary Electronics Ltd) consists of two separated main sub-blocks, such as LNA Plate called as BJEL10, and Indoor Controller called as BJEI10.
The LNA Plate is designed for hub-mounted conditions, as it is going to be assembled to the antenna, while the indoor controller is located in a 19” rack, and it will be used in the control room to monitor and control the redundant LNA system.
The indoor controller has redundant hot swappable AC/DC power supply for higher reliability. The complete system can handle two additional LNA units for tracking purposes.
In normal condition two LNAs (LNA1 and LNA2) are operating simultaneously, one for receiving polarization, and the other one for receiving polarization.
In case of failure in LNA1 or LNA2, the third spare LNA (LNA3) can be switched into the RF line instead of the faulty LNA. The switching is performed by the waveguide/coaxial switches according to the schematic.
The switching mode can be “Auto” or “Manual”. In case of manual mode, the switches can be controlled directly by the operator, while in auto mode, the switching is decided by the indoor controller M&C circuitry. If the monitored parameters of the operating LNA are out of the normal range, then the monitoring logic labels that LNA as faulty, and switches the spare LNA instead the faulty one automatically.
There are also coupled ports available to be able to monitor the RF lines without disconnecting them from the system.
OFFLINE IN and OFFLINE OUT ports can be used for monitoring the spare LNA.
The LNA plate is located in the hub, and can be fully controlled and monitored by the indoor controller unit.
The communication interface between the plate and the indoor controller is RS485. M&C functions are available both in local and remote mode.
In local mode, the operator is using the front panel buttons and LCD display, while in remote mode a PC or notebook is connected to the indoor controller via the Ethernet interface.
In this case the operator can use the supplied GUI for the M&C functions.