User's Manual

RFDS Set-up and Calibration68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

3-99

RFDS Calibration

The RFDS Calibration option is used to calibrate the RFDS TX and RX

paths.

TX Path Calibration - For a TX antenna path calibration the BTS

XCVR is keyed at a pre-determined power level and the BTS power

output level is measured by the RFDS. The power level is then measured

at the TX antenna directional coupler by the power measuring test

equipment item being used (power meter or analyzer). The difference

(offset) between the power level at the RFDS and the power level at the

TX antenna directional coupler is used as the TX RFDS calibration

offset value.

RX Path Calibration - For an RX antenna path calibration the RFDS is

keyed at a pre-determined power level and the power input level is

measured by the BTS BBX. A CDMA signal at the same power level

measured by the BTS BBX is then injected at the RX antenna directional

coupler by the communications system analyzer. The difference (offset)

between the RFDS-keyed power level and power level measured at the

BTS BBX is the RFDS RX calibration offset value.

RFDS calibration and the CAL file - The TX and RX RFDS

calibration offset values are written to the CAL file in the slot[385]

Block.

TSIC channel frequency - For each RFDS TSIC, the channel

frequency is determined at the lower third and upper third of the

appropriate band using the frequencies listed in Table 3-50.

Table 3-50: RFDS TSIC Calibration Channel Frequencies

System Channel Calibration Points

800 MHz (A and B) 341 and 682

1.9 GHz 408 and 791

Before installing any test equipment directly to any TX

OUT connector, verify that there are no CDMA channels

keyed. Failure to do so can result in serious personal injury

and/or equipment damage.

WARNING