User's Manual

4. Calibration
When BTS is successfully started, some of its initializing data can be configured via
EMS client so that BTS is calibrated for normal work.
During base station calibration, the inter-antenna phase difference can be measured and
the all output power from RFS to antenna can be matched. The calibration should be
conducted at least three times to ensure its effectiveness. At least 20 minutes are
required for loading new software in RFC.
Complete calibration
As there may be changes in the system due to temperature and climate changes as well
as normal equipment aging in normal operation, the base station must be completely
calibrated before power-on after implementation. The calibration is based on the target
data set in EMS. In the SkyWay-Mobile BTS system complete calibration is adopted.
In complete calibration, calculation is conducted of the power and gain in each antenna
to get data for calibrating base station antenna. The calibration result covers calibration
data of the eight antennas, current sending and receiving amplitude and phase diagrams
of the current calibration results, comparison with history calibration data, etc.
In complete calibration a log file will be generated in the “calibration” folder in the
“system” of EMS installation folder (standard file location), with standard file name in
154_20061206163046 format. Here,154 is the base station ID and the digits are the time
of calibration (year, month, day, hour, minute, second, or YYYYMMDDhhmmss).
Calibration method
In EMS client computer, open IE and start EMS client GUI in IE address bar; input user
name and password in EMS client login window. Click [Resource Management| Network
Element Management] and select the bts just added and successfully started. Double
click to open BTS panel (Fig 4-1).