User Manual

INSTALLATION GUIDE
Proprietary Information
Title: BEAMER Array System-
Assembly and Operation Manual
Doc. No.: 913000100 Rev.: 00
Page: 29 of 92
2.4.4. Bias-Ts
In this manual, Bias-Ts are also termed 'sub-array', since each Bias-T can serves an independent
portion of an array (i.e., Tx sub-array or Rx1 and Rx2 sub-arrays, which are all physically part of the
same array, but are logically independent entities).
The Bias-Ts serve four purposes:
1. Supply DC voltage to the BEAMER modules within the sub-array.
2. Provide DCA controlled RF amplification stage, to overcome possible RF distribution losses
and to provide control on the transmitted or received output power per sub-array.
3. Connect the BEAMER modules Telemetry to the ICU controller via the superimposed FSK
link.
4. Enable the S/W downloading to each BEAMER of the array using the Telemetry channel.
The sub-array direction of the ICU Bias-T connector is N-type connector, capable of supporting the
DC current to the sub-array. The BTS side is TNC type connector. The following figure shows the
active Bias-T location on the ICU.
Figure 11: Bias-T inputs / outputs and numbering
Viewed from right to left, the Bias-Ts are organized as:
[Rx
1
-Rx
2
-Tx], [Rx
1
-Rx
2
-Tx], [Rx
1
-Rx
2
-Tx], [Rx
1
-Rx
2
-Tx]
Bias-T number 1 is on the far right going to Bias-T number 12 at the near left. These (physical)
numbers also serve as logical addresses for the Bias-T (sub-arrays) at the system setup.
In case less arrays are integrated in the system, the number of Bias-Ts will be reduced.