User Manual

Test Set Calibration – continued
5/21/04 1X SC4812T–MC BTS Optimization/ATP 3-75
DRAFT
Table 3-29: Calibrating RX Cables Using a Signal Generator and Spectrum Analyzer
n ActionStep
5 Calibration factor = A – B. Example: Cal = –12 dBm – (–14 dBm) = 2 dBm
NOTE
The short cable is used for calibration only. It is not part of the final test setup. After calibration is
completed, do not re-arrange any cables. Use the equipment setup, as is, to ensure test procedures
use the correct calibration factor.
Figure 3-25: Calibrating Test Equipment Setup for RX ATP Test
(using Signal Generator and Spectrum Analyzer)
Spectrum
Analyzer
Signal
Generator
a
b
Spectrum
Analyzer
SHORT
TEST
CABLE
SHORT TEST
CABLE
CONNECTION TO THE HP PCS
INTERFACE OUTPUT PORT
DURING RX MEASUREMENTS.
Signal
Generator
BULLET
CONNECTOR
LON
G
cable
2
CONNECTION TO THE RX PORTS
DURING RX MEASUREMENTS.
FW00294
Setting Cable Loss Values
Cable loss values for the TX and RX test cable configurations are
normally set by accomplishing cable calibration using the applicable test
equipment. The resulting values are stored in the cable loss files. The
cable loss values can also be set/changed manually. Follow the procedure
in Table 3-30 to set cable loss values.
If cable calibration was performed without using the LMF,
cable loss values must be manually entered in the LMF
database. Failure to do this will result in inaccurate BTS
calibration and reduced site performance.
CAUTION
Prerequisites
S Logged into the BTS
3