User's Manual

INSTALLATION GUIDE
Confidential, Proprietary Information
Title: PolBEAMER PCS (3.2) Array System-
Assembly and Operation Manual
Doc. No.:
913000801
Rev.: 01
Page: 47 of 91
Failure Description Recommended Value
BEAMER® supply voltage 01 minor
Tx current 02 major
Main Rx current 01 minor
Div Rx current 01 minor
Return power 01 minor
Power amplifier 02 major
Linearizer 02 major
Bias T voltage 02-major
ICU voltage 02-major
Rx bias T current 01- minor
Tx bias T current 02-major
BEAMER® CTRLR 02-minor
ICU CTRLR 01-minor
Fan current 00-no condition
2.8.4.5. Changing the Real Time Clock
The real time clock correct timing is important for log files time stamp. To change the RTC
timing use 'Save real time clock' command (code 38). The following example sets the time to
10:00:00AM, at 31.03.2001:
Code 38 (save real time clock), ICU address, 1FH, 03, 0BH, 0AH, 00, 00
Note: Years are counted since 1990, thus 2001 is represented as 0BH (=11).
2.8.5. Calibrating the Transmit Channel Gain
Before calibrating the transmit channel gain and connecting the BTS transmitter to the
BEAMER® -Tx array input, verify that the Tx-ABT is set to minimum gain (maximum
attenuation). Instructions for Tx-ABT gain setting can be found in section 2.8.3. This is
essential for protecting the BEAMER® from possible overdrive due to high input power from
the BTS.
The following diagram can be used as a guideline to determine the gain distribution over the
transmit link. The numbers within the shaded circles represent Maximum BEAMER® system
expected performance. However, some gain variations might occur. These variations might
be due to gain variations with BTS output power, the active Bias-T gain, RF cable loss and
BEAMER® -Tx gain. It is therefore important that the gain calibration procedure will be
performed whenever one of the system components is changed: the BEAMER® array, the
RF cable, the active Bias-T or the BTS up-converter output.